Engineering Structures Impact Factor Jobs in Tucson Remote
1,091 positions found
Date Posted:
2026-03-09Country:
United States of AmericaLocation:
US-AZ-TUCSON-M02 ~ 1151 E Hermans Rd ~ BLDG M02Position Role Type:
OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements:
The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceSecurity Clearance Type:
DoD Clearance: SecretSecurity Clearance Status:
Active and existing security clearance required after day 1At Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. Our team solves tough, meaningful problems that create a safer, more secure world.
The Effector Analog & Power (EAP) Department is seeking an Engineering Lab Lead. This individual will collaborate closely with other Lab Leads, Engineering staff, and Technicians to ensure the Engineering Labs adhere to established company policies and provide hardware development support to program teams.
This position works closely with all levels of leadership in multiple organizations as well as managing lab utilization across various projects. As a member of the team, this position will lead day-to-day operation requirements in Engineering Labs, with a particular focus on safety, compliance, security, improvement, and program support. The Lab Lead owns the quality and performance of the EAP Department’s Engineering Labs.
What You Will Do
- Lab Operating Procedure (LOP) Management; provide direction for lab users on established policies.
- Management, coordination, and implementation of:
- Environmental Health and Safety standards
- Lab Operating Procedures
- Property tracking and calibration
- Personnel lab access lists and training matrices
- Take a proactive role in developing, understanding, and implementing common lab processes, tools, templates, and metrics.
- Oversee audit assessment preparation; Engineering Lab Objective Evaluation and Factory & Lab Assessment reviews; develop corrective action plans and assist in the development of long-range objectives.
- Safeguard classified/proprietary material, hardware, and documentation.
Qualifications You Must Have
- Requires a degree in Science, Technology, Engineer and Mathematics and a minimum of 5 years prior relevant experience
- A minimum of two (2) years of experience managing safety, compliance, and processes in an Engineering, or similar, environment.
Qualifications We Prefer
- A Bachelor of Science degree in Business Administration or STEM field.
- Experience with chemical handling, metrology, and property control requirements and processes.
- Possess strong organizational, coordination, planning, analytical, and problem-solving skills.
- Exemplary oral communication and interpersonal/human relations skills.
- Leadership behaviors and willingness to make decisions and embrace change.
- Experience developing solutions and maintaining audit readiness procedures and goals for an organization.
- Experience working directly with engineers, technicians, and leadership in an engineering lab environment in the areas of safety, security, compliance, and property management.
- Experience with EHS, NISPOM, and Foreign Object Elimination processes.
What We Offer
- Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation.
- Work Schedule: 9/80 schedule (every other Friday off)
- Relocation Eligibility: This position is eligible for relocation
Learn More & Apply Now!
- Please consider the following role type definition as you apply for this role.
- Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products.
- This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here:
- Tucson, AZ:
#LI-SP1
As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.
The salary range for this role is 86,800 USD - 165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.
Privacy Policy and Terms:
Click on this link to read the Policy and Terms
Date Posted:
2026-02-02Country:
United States of AmericaLocation:
US-AZ-TUCSON-M10 ~ 3360 E Hemisphere Loop ~ BLDG M10Position Role Type:
OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements:
The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceSecurity Clearance Type:
DoD Clearance: SecretSecurity Clearance Status:
Active and existing security clearance required after day 1At Raytheon , the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. Our team solves tough, meaningful problems that create a safer, more secure world.
The Mechanical Engineering group in the Shipboard Effectors Department seeking an experienced Mechanical Engineer REA (Responsible Engineering Authority) to contribute to the mechanical technical team for a common Guidance Unit (Stack). This role is primarily responsible for maintaining mechanical Technical Data Package (TDP) configuration changes, driving producibility updates, supporting failure investigations, supporting alternate component and material evaluations and testing, providing support across the full spectrum of mechanical, environmental, structural, and thermal engineering disciplines. Additionally, the mechanical engineer will be part of a small team of mechanical engineers, ensuring successful support of both production and development efforts.
This is an onsite role and located in Tucson, Az.
What You Will Do
Serve as the mechanical engineer to support documentation, mechanical, environmental, structural, and thermal aspects of different stack configurations.
Contribute to a small team of mechanical production REAs supporting mechanical production and development efforts, ensuring technical excellence and alignment with program objectives.
Oversee and manage all mechanical, slice and stack TDP configuration changes, ensuring updates address producibility improvements, yield optimization, and design enhancements.
Lead efforts to analyze and incorporate producibility updates into designs to improve manufacturing efficiency and reduce production defects.
Support failure investigations, conducting root cause analyses and implementing corrective actions to resolve systemic mechanical issues.
Provide technical guidance on mechanical design, analysis, and integration challenges, ensuring compliance with program requirements and performance specifications.
Drive design for manufacturability (DFM) practices and lead efforts to identify and implement cost-saving opportunities in mechanical assemblies.
Collaborate with cross-functional teams, including systems engineering, quality, and supply chain, to resolve mechanical engineering challenges and ensure seamless integration of stack configurations.
Provide oversight and review of hardware performance during environmental testing, including structural and thermal analysis, to ensure compliance with design requirements.
Maintain and update mechanical TDPs, processing engineering change requests such as IRs, CNs, SRs, and variances to ensure accurate and current documentation.
Positive attitude toward being mentored by experienced technical team members and subject matter experts within Raytheon.
Qualifications You Must Have:
Typically requires a Bachelors Degree in Science, Technology, Engineering, and Mathematics (STEM) and a minimum of 5 years of prior relevant experience or an advanced degree in a related field and minimum 3 years experience.
Five years’ experience in mechanical design and design documentation
Experience with 3D CAD tools (modeling and drawing)
Experience with Geometric Dimensioning & Tolerancing (GD&T) per ANSI Y14.5
Experience with the packaging of electronics assemblies
Knowledge of environmental testing and hardware performance validation, including structural and thermal analysis.
The ability to obtain and maintain a US security clearance. U.S. citizenship is required as only U.S. citizens are eligible for a security clearance.
Qualifications We Prefer
Strong interpersonal and communication skills; both verbal and written
Experience in mechanical sub-systems packaging, materials, interconnects, or large assembly development
Experience with managing engineering change processes, including IRs, CNs, SRs, and variances.
Proficient in Creo (modeling and drawing) and Windchill (PDM)
Strong understanding of design for manufacturability (DFM) and design for producibility (DFP) principles.
Active DoD issued security clearance
Experience working in the aerospace and defense industry.
Advanced degree in Engineering discipline
What We Offer
Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation.
Please consider the following role type definition as you apply for this role.
Onsite : Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products.
As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.
The salary range for this role is 86,800 USD - 165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.
Privacy Policy and Terms:
Click on this link to read the Policy and Terms
Date Posted:
2026-02-02Country:
United States of AmericaLocation:
US-AZ-TUCSON-M10 ~ 3360 E Hemisphere Loop ~ BLDG M10Position Role Type:
OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements:
Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceSecurity Clearance Type:
DoD Clearance: SecretSecurity Clearance Status:
Ability to obtain INTERIM U.S. government issued security clearance is required prior to start dateAt Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. Our team solves tough, meaningful problems that create a safer, more secure world.
The Mechanical Engineering group in the Shipboard Effectors Department is currently searching for an experienced Mechanical Design Engineer to work on a multi-discipline team to support design and upgrades of Shipboard Effectors products and subsystems.
This is an onsite role and located in Tucson, AZ.
What You Will Do:
Utilizing strong mechanical hardware design experience and knowledge with ruggedized structures, interconnects, cooling, and electronics integration
Supporting all phases of programs from capture and concept development through production
Developing technical solutions to a wide range of complex problems related to the entire product life cycle including proposal, design, manufacture, integration and test of electronics for multiple military programs
Supervising the definitions of mechanical outline and construction details, component selection and specification, mechanical and assembly drawings, electrical/RF layout, and delivering the final technical data package
Employing transition-to-production practices with the ability to lead a design release into production
Tracking, reporting, and meeting cost, schedule, quality, and performance requirements for the finished product, including Earned Value (EV) management and Estimate at Complete (EAC) inputs
Preparing proposal inputs on behalf of the product area
Providing technical conscience, challenged with making sure the product and process meet appropriate standards and requirements while helping to remove roadblocks
Working with minimal direction or supervision, while exercising considerable latitude in determining the technical objectives of the assignment while meeting cost, schedule, quality, and performance requirements for the finished product.
Leading a small team of mechanical engineers when required
Interacting frequently with senior personnel, occasionally including external customers, on significant technical matters often requiring coordination between organizations.
Qualifications You Must Have:
Typically requires a degree in Science, Technology, Engineering or Mathematics (STEM) and a minimum of 8 years of prior relevant experience or An Advanced Degree in a related field and minimum 5 years experience.
A minimum of eight (8) years of experience in the design of electronics packaging for military or aerospace or commercial applications
Experience with GD&T (Geometric Dimensioning & Tolerances)
The ability to obtain and maintain a US security clearance prior to the start date. U.S. citizenship is required as only U.S. citizens are eligible for a security clearance
Qualifications We Prefer:
Experience with ANSI drawing standards and/or first order or structural analysis techniques.
Experience with design to military standards
Strong technical background with high technical aptitude
Strong leadership skills and project management, sub contract management experience
Experience with CREO (Pro/E) or similar 3D solid modeling software
Cognizant of machine suppliers’ capabilities or have direct experience in a manufacturing and assembly support role for producibility
Familiarity with the design and manufacturing processes of CCAs, mechanical/RF components, metal housings, structures, and electronics assemblies
Must have a working knowledge of Microsoft Office (Word, Excel, PowerPoint)
Very strong verbal and written communications and interpersonal skills when working with team members and customers
Advanced degree in Mechanical, Electrical or Aerospace Engineering
What We Offer
Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation.
Learn More & Apply Now!
RTX solves some of the toughest challenges in aerospace and defense. That requires expansive thinking and bold innovation.
Please consider the following role type definition as you apply for this role.
Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products.
As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.
The salary range for this role is 107,500 USD - 204,500 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills. Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement. Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance. This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply. RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.
Privacy Policy and Terms:
Click on this link to read the Policy and Terms
Date Posted:
2026-02-27Country:
United States of AmericaLocation:
US-AZ-TUCSON-M10 ~ 3360 E Hemisphere Loop ~ BLDG M10Position Role Type:
OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements:
The ability to obtain and maintain a U.S. government issued security clearance is required. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceSecurity Clearance Type:
DoD Clearance: SecretSecurity Clearance Status:
Active and existing security clearance required after day 1At Raytheon, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. Our team solves tough, meaningful problems that create a safer, more secure world.
This is a Program direct-support position and requires a technical understanding of piece part electronic components and their assembly level applications. This candidate will transition into a key leadership position in the supporting program Obsolescence Integrated Product Team and will drive issue resolution for situations involving obsolescence.
The selected candidate will perform and/or assist in the performance of Parts Engineering, Components Engineering or Applications Engineering tasks supporting programs in the Proposal, System Design Description, Low Rate Initial Production, Production and Support phases. Position will require day to day interface with Designers, Contracts, Estimating, Supply Chain, Program Management, and other disciplines.
This position is an onsite role, located in Tucson, AZ.
What You Will Do:
- Understand and/or generate a program statement of work (SOW) and other defined customer component application requirements.
- Develop and/or sustain a proactive Obsolescence Management process to deliver cost saving obsolescence mitigation strategies and solutions.
- Drive resolution through support or execution of lifetime buys, selections of alternate parts, redesign efforts or other mitigation strategies and will facilitate and support contract negotiations, basis of estimates, and supplier statements of work for proposal efforts.
- Interact with Program and customer leadership on a regular basis to communicate status of mitigation strategies.
- Conduct trade study analysis help identify cost effective obsolescence driven cut in points for proposed unit redesigns.
Qualifications You Must Have:
- Typically requires a Bachelor’s in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of 5 years of prior relevant experience with any combination of the following:
- Experience with proactive and reactive component obsolescence management methodologies.
- Experience with data collection, analysis, and presentation skills to adequately discuss system impact of component obsolescence issues.
- Experience with project management working with schedules, costs, and integration of stakeholder needs throughout the obsolescence process.
- Financial and Contract Management experience with proposals, BOE, EVMs, SOWs, CLINs and CDRLs.
- Experience with BOM (Bill of Material) development and management for developmental and production programs.
- Risk and Opportunity business case analysis experience supporting sustainment vs redesign cut in decisions.
Qualifications We Prefer:
- Master’s Degree in Electrical Engineering or other related science or engineering discipline
- Ability to navigate multiple complex processes and tools.
- Understanding of the application of technical theories and concepts as they apply to electronic components and the parts management field.
- Ability to read and interpret engineering drawings and hierarchy definition.
- Knowledge of component failure modes by commodity
- Knowledge of Component MIL drawings, standards, test specifications, and associated QPLs and QMLs
- Knowledge of component selection, screening, qualification, and derating for use in military, and aerospace flight applications
- Knowledge of analog design and analysis, general knowledge of digital circuitry and interfaces
- Excellent communication skills to interface with other Integrated Product Team members, including Electrical Engineering, Mechanical Engineering, Supply Chain Management, Quality, Operations, and Supplier Engineering.
- Capable of supporting regular customer interactions including but not limited to leadership engagements, responding to proposal requests and contract negotiations.
- Outstanding organizational, presentation and technical skills.
- Ability to multi-task and appropriately prioritize responsibilities.
- Willingness to support occasional travel.
What We Offer
Our values drive our actions, behaviors, and performance with a vision for a safer, more connected world. At RTX we value: Trust, Respect, Accountability, Collaboration, and Innovation.
This position offers relocation based on candidate eligibility.
Learn More & Apply Now!
This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here:
As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.
The salary range for this role is 86,800 USD - 165,200 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement.Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance.This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.
Privacy Policy and Terms:
Click on this link to read the Policy and Terms
Date Posted:
2026-02-17Country:
United States of AmericaLocation:
US-AZ-TUCSON-805 ~ 1151 E Hermans Rd ~ BLDG 805Position Role Type:
OnsiteU.S. Citizen, U.S. Person, or Immigration Status Requirements:
Active and transferable U.S. government issued security clearance is required prior to start date. U.S. citizenship is required, as only U.S. citizens are eligible for a security clearanceSecurity Clearance Type:
DoD Clearance: SecretSecurity Clearance Status:
Ability to obtain INTERIM U.S. government issued security clearance is required prior to start dateAt RTX, the foundation of everything we do is rooted in our values and a higher calling – to help our nation and allies defend freedoms and deter aggression. We bring the strength of more than 100 years of experience and renowned engineering expertise to meet the needs of today’s mission and stay ahead of tomorrow’s threat. Our team solves tough, meaningful problems that create a safer, more secure world.
The Test Equipment Engineering (TEE) organization within RTX drives business success by providing a variety of critical engineering services across product lines and functions.
We have an exciting opportunity for a full-time position of Principal Integrated Product Manager, located onsite in Tucson, Arizona. This position requires leading a team of multi-discipline engineers, providing technical and execution oversight, and managing multiple projects for a program. If you enjoy project management, partnership with other functional organizations, and establish strong relationships with the program office and customer, this is the job for you!
Qualifications You Must Have:
- Typically requires a Bachelor's Degree in Science, Technology, Engineering, or Mathematics (STEM) and a minimum of eight (8) years’ prior relevant experience
- Experience with Earned Value Management System (EVMS) and Program management.
- Experience with Test Systems Engineering or equivalent Engineering experience for both hardware and test software development, integration, verification, validation, and maintenance activities within production, manufacturing, product qualification environments.
- Experience with program management tools such as EVMS, Integrated Master Plan (IMP), Integrated Master Schedule (IMS), and Risk and Opportunity Management.
- Experience with budget, schedule, Estimate at Complete (EAC) process, and financial performance report generation with Test Systems Engineering or equivalent Engineering programs.
- Experience with Budget Change Request (BCR) and Basis of Estimate (BOE) generation for Test Systems Engineering programs.
Qualifications We Prefer:
- Experience in managing multi-disciplinary teams.
- EVMS certification, Program Management certification, or equivalent to Raytheon PM Level 6 certification
- Demonstrate IPTL experience showing the ability to collaborate with program office, cross-functional teams, and internal/external customers.
- Strong influential communication and interpersonal skills with the ability to present analytic and performance results from program to functional leadership.
- Experience in small/medium program execution
- Demonstrate understanding of engineering development, transition to production, production, and maintenance.
- Experience with proposal capture and contract processes from receipt of RFP, preparing Basis of Estimates, proposal submittal, preparing Statements of Work, contract startup and contract close-out.
- Experience with all the functionalities of Automation Test Equipment/Unit Under Test (ATE/UUT).
- Agile Methodologies understanding.
What We Offer:
- Our values drive our actions, behaviors and performance with a vision for a safer, more connected world. At RTX we value Safety, Trust, Respect, Accountability, Collaboration and Innovation.
Learn More & Apply Now!
- Please consider the following role type definitions as you apply for this role.
- Onsite: Employees who are working in Onsite roles will work primarily onsite. This includes all production and maintenance employees, as they are essential to the development of our products.
- This position requires a security clearance. DCSA Consolidated Adjudication Services (DCSA CAS), an agency of the Department of Defense, handles and adjudicates the security clearance process. More information about Security Clearances can be found on the US Department of State government website here:
Location Information:
- Tucson, AZ
As part of our commitment to maintaining a secure hiring process, candidates may be asked to attend select steps of the interview process in-person at one of our office locations, regardless of whether the role is designated as on-site, hybrid or remote.
The salary range for this role is 107,500 USD - 204,500 USD. The salary range provided is a good faith estimate representative of all experience levels. RTX considers several factors when extending an offer, including but not limited to, the role, function and associated responsibilities, a candidate’s work experience, location, education/training, and key skills.Hired applicants may be eligible for benefits, including but not limited to, medical, dental, vision, life insurance, short-term disability, long-term disability, 401(k) match, flexible spending accounts, flexible work schedules, employee assistance program, Employee Scholar Program, parental leave, paid time off, and holidays. Specific benefits are dependent upon the specific business unit as well as whether or not the position is covered by a collective-bargaining agreement.Hired applicants may be eligible for annual short-term and/or long-term incentive compensation programs depending on the level of the position and whether or not it is covered by a collective-bargaining agreement. Payments under these annual programs are not guaranteed and are dependent upon a variety of factors including, but not limited to, individual performance, business unit performance, and/or the company’s performance.This role is a U.S.-based role. If the successful candidate resides in a U.S. territory, the appropriate pay structure and benefits will apply.RTX anticipates the application window closing approximately 40 days from the date the notice was posted. However, factors such as candidate flow and business necessity may require RTX to shorten or extend the application window.RTX is an Equal Opportunity Employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability or veteran status, or any other applicable state or federal protected class. RTX provides affirmative action in employment for qualified Individuals with a Disability and Protected Veterans in compliance with Section 503 of the Rehabilitation Act and the Vietnam Era Veterans’ Readjustment Assistance Act.
Privacy Policy and Terms:
Click on this link to read the Policy and Terms
Job Family : Mechanical Design Engineering
Organization : Data Center Infrastructure Team
Location : Remote* OR Austin, TX
*Requires up to 30% domestic and/or international travel (rare)
How will you make an impact?
We are seeking a highly skilled, technically proficient and detail-oriented Principal Mechanical Engineer with expertise in metal structures, frame design, pipes and fabrication to support the development of power and cooling infrastructure for data centers. This role is critical in designing robust mechanical systems that house and support electrical and thermal management equipment, ensuring structural integrity, manufacturability, and compliance with industry standards.
What will you do?
* Experience designing and integrating hydronic systems including pumps, piping networks, valves, and heat exchangers for data center cooling applications.
* Knowledge of fluid dynamics, pressure drop calculations, and pipe sizing for chilled water and glycol-based systems.
* Understanding of installation constraints, maintenance access, and serviceability in large-scale mechanical infrastructure.
* Design and develop mechanical frames, enclosures, and support structures for data center power and cooling products (UPS systems, battery racks, CRAC units, containment systems, LVS, MVS).
* Perform advanced structural analysis using FEA tools to validate mechanical integrity under static, dynamic, seismic, and thermal loads.
* Analyze load paths, stress concentrations, and fatigue life of structural components to ensure long-term reliability.
* Design metal enclosures with considerations for airflow, thermal containment, EMI shielding, and environmental protection.
* Evaluate and implement new materials, coatings, and fabrication technologies to enhance product performance and reliability.
* Participate in customer engagements and site visits to understand deployment constraints and gather feedback for design improvements.
* Create detailed CAD models and fabrication drawings, including weldments, sheet metal, and machined parts
* Select appropriate materials and fabrication methods to optimize cost, performance, and reliability
* Collaborate with electrical, thermal, and systems engineering teams to integrate mechanical designs with functional components.
* Lead mechanical design reviews and contribute to cross-functional design validation efforts.
* Develop and maintain design documentation including BOMs, specifications, test plans, and engineering change orders (ECOs).
* Drive continuous improvement in mechanical design for manufacturability (DFM), cost reduction, and performance optimization.
* Interface with suppliers and customers to resolve fabrication issues and ensure quality standards are met.
* Support lifecycle management of mechanical components, including obsolescence planning and alternate sourcing.
* Conduct root cause analysis and corrective actions for mechanical failures or field issues.
* Ensure mechanical designs support airflow management, thermal containment, and integration with cooling systems (in-row cooling, rear door heat exchangers).
* Collaborate with compliance and certification teams to ensure mechanical designs meet global regulatory requirements (UL, CE, RoHS, REACH)
* May perform other duties and responsibilities as assigned
How will you get here?
Education :
* Bachelor's Degree in Mechanical Engineering or related engineering discipline.
Experience :
* 8+ years of experience in mechanical design and fabrication, preferably in data center, industrial, or power systems environment.
* Proficiency in CAD tools (SolidWorks, Creo, Inventor) and FEA software (ANSYS, Abaqus).
* Strong knowledge of metal fabrication processes including welding, sheet metal forming, and machining is a must
* Experience with structural design for heavy equipment or large assemblies, and familiarity with thermal and airflow considerations in enclosure design is required
* Excellent communication and cross-functional collaboration skills
Knowledge, Skills, Abilities:
* Excellent interpersonal and communication skills
* Creative, self-motivated, accountable, and team-oriented
* Able to work independently with minimal oversight
* Proficient in reading, analyzing, and interpreting general business publications, professional journals, technical procedures, and government regulations
* Skilled in writing reports, business correspondence, and procedural guides
* Effective at presenting information and responding to management, clients, and public queries
* Capable of influencing others and sharing best practices
* Comfortable working as part of a global team
* Capable of assessing projects, articulating risks, and developing project milestones
* Familiar with stage-gate processes in project lifecycle management (PLCM)
* Able to mentor less experienced engineers
* Ability to travel both domestically and internationally up to 30%
Preferred Qualifications:
* Master's Degree in Mechanical Engineering
* Experience designing mechanical systems for data centers, telecom, or industrial power/cooling products.
* Active Professional Engineer (PE) license.
* Knowledge of regulatory and safety standards applicable to data center infrastructure.
* Hands-on experience with prototype fabrication and testing; Experience working with global suppliers and contract manufacturers a plus
Remote working/work at home options are available for this role.
Job Family: Mechanical Design Engineering
Organization: Data Center Infrastructure Team
Location: Remote* OR Austin, TX
*Requires up to 30% domestic and/or international travel (rare)
How will you make an impact?
We are seeking a highly skilled, technically proficient and detail-oriented Principal Mechanical Engineer with expertise in metal structures, frame design, pipes and fabrication to support the development of power and cooling infrastructure for data centers. This role is critical in designing robust mechanical systems that house and support electrical and thermal management equipment, ensuring structural integrity, manufacturability, and compliance with industry standards.
What will you do?
- Experience designing and integrating hydronic systems including pumps, piping networks, valves, and heat exchangers for data center cooling applications.
- Knowledge of fluid dynamics, pressure drop calculations, and pipe sizing for chilled water and glycol-based systems.
- Understanding of installation constraints, maintenance access, and serviceability in large-scale mechanical infrastructure.
- Design and develop mechanical frames, enclosures, and support structures for data center power and cooling products (UPS systems, battery racks, CRAC units, containment systems, LVS, MVS).
- Perform advanced structural analysis using FEA tools to validate mechanical integrity under static, dynamic, seismic, and thermal loads.
- Analyze load paths, stress concentrations, and fatigue life of structural components to ensure long-term reliability.
- Design metal enclosures with considerations for airflow, thermal containment, EMI shielding, and environmental protection.
- Evaluate and implement new materials, coatings, and fabrication technologies to enhance product performance and reliability.
- Participate in customer engagements and site visits to understand deployment constraints and gather feedback for design improvements.
- Create detailed CAD models and fabrication drawings, including weldments, sheet metal, and machined parts
- Select appropriate materials and fabrication methods to optimize cost, performance, and reliability
- Collaborate with electrical, thermal, and systems engineering teams to integrate mechanical designs with functional components.
- Lead mechanical design reviews and contribute to cross-functional design validation efforts.
- Develop and maintain design documentation including BOMs, specifications, test plans, and engineering change orders (ECOs).
- Drive continuous improvement in mechanical design for manufacturability (DFM), cost reduction, and performance optimization.
- Interface with suppliers and customers to resolve fabrication issues and ensure quality standards are met.
- Support lifecycle management of mechanical components, including obsolescence planning and alternate sourcing.
- Conduct root cause analysis and corrective actions for mechanical failures or field issues.
- Ensure mechanical designs support airflow management, thermal containment, and integration with cooling systems (in-row cooling, rear door heat exchangers).
- Collaborate with compliance and certification teams to ensure mechanical designs meet global regulatory requirements (UL, CE, RoHS, REACH)
- May perform other duties and responsibilities as assigned
How will you get here?
Education:
- Bachelor’s Degree in Mechanical Engineering or related engineering discipline.
Experience:
- 8+ years of experience in mechanical design and fabrication, preferably in data center, industrial, or power systems environment.
- Proficiency in CAD tools (SolidWorks, Creo, Inventor) and FEA software (ANSYS, Abaqus).
- Strong knowledge of metal fabrication processes including welding, sheet metal forming, and machining is a must
- Experience with structural design for heavy equipment or large assemblies, and familiarity with thermal and airflow considerations in enclosure design is required
- Excellent communication and cross-functional collaboration skills
Knowledge, Skills, Abilities:
- Excellent interpersonal and communication skills
- Creative, self-motivated, accountable, and team-oriented
- Able to work independently with minimal oversight
- Proficient in reading, analyzing, and interpreting general business publications, professional journals, technical procedures, and government regulations
- Skilled in writing reports, business correspondence, and procedural guides
- Effective at presenting information and responding to management, clients, and public queries
- Capable of influencing others and sharing best practices
- Comfortable working as part of a global team
- Capable of assessing projects, articulating risks, and developing project milestones
- Familiar with stage-gate processes in project lifecycle management (PLCM)
- Able to mentor less experienced engineers
- Ability to travel both domestically and internationally up to 30%
Preferred Qualifications:
- Master’s Degree in Mechanical Engineering
- Experience designing mechanical systems for data centers, telecom, or industrial power/cooling products.
- Active Professional Engineer (PE) license.
- Knowledge of regulatory and safety standards applicable to data center infrastructure.
- Hands-on experience with prototype fabrication and testing; Experience working with global suppliers and contract manufacturers a plus
Remote working/work at home options are available for this role.
Job Family: Mechanical Design Engineering
Organization: Data Center Infrastructure Team
Location: Remote* OR Austin, TX
*Requires up to 20% domestic and/or international travel (rare)
How will you make an impact?
We are seeking a highly skilled, technically proficient and detail-oriented Principal Mechanical Engineer with expertise in metal structures, frame design, pipes and fabrication to support the development of power and cooling infrastructure for data centers. This role is critical in designing robust mechanical systems that house and support electrical and thermal management equipment, ensuring structural integrity, manufacturability, and compliance with industry standards.
What will you do?
- Experience designing and integrating hydronic systems including pumps, piping networks, valves, and heat exchangers for data center cooling applications.
- Knowledge of fluid dynamics, pressure drop calculations, and pipe sizing for chilled water and glycol-based systems.
- Understanding of installation constraints, maintenance access, and serviceability in large-scale mechanical infrastructure.
- Design and develop mechanical frames, enclosures, and support structures for data center power and cooling products (UPS systems, battery racks, CRAC units, containment systems, LVS, MVS).
- Perform advanced structural analysis using FEA tools to validate mechanical integrity under static, dynamic, seismic, and thermal loads.
- Analyze load paths, stress concentrations, and fatigue life of structural components to ensure long-term reliability.
- Design metal enclosures with considerations for airflow, thermal containment, EMI shielding, and environmental protection.
- Evaluate and implement new materials, coatings, and fabrication technologies to enhance product performance and reliability.
- Participate in customer engagements and site visits to understand deployment constraints and gather feedback for design improvements.
- Create detailed CAD models and fabrication drawings, including weldments, sheet metal, and machined parts
- Select appropriate materials and fabrication methods to optimize cost, performance, and reliability
- Collaborate with electrical, thermal, and systems engineering teams to integrate mechanical designs with functional components.
- Lead mechanical design reviews and contribute to cross-functional design validation efforts.
- Develop and maintain design documentation including BOMs, specifications, test plans, and engineering change orders (ECOs).
- Drive continuous improvement in mechanical design for manufacturability (DFM), cost reduction, and performance optimization.
- Interface with suppliers and customers to resolve fabrication issues and ensure quality standards are met.
- Support lifecycle management of mechanical components, including obsolescence planning and alternate sourcing.
- Conduct root cause analysis and corrective actions for mechanical failures or field issues.
- Ensure mechanical designs support airflow management, thermal containment, and integration with cooling systems (in-row cooling, rear door heat exchangers).
- Collaborate with compliance and certification teams to ensure mechanical designs meet global regulatory requirements (UL, CE, RoHS, REACH)
- May perform other duties and responsibilities as assigned
How will you get here?
Education:
- Bachelor’s Degree in Mechanical Engineering or related engineering discipline.
Experience:
- 8+ years of experience in mechanical design and fabrication, preferably in data center, industrial, or power systems environment.
- Proficiency in CAD tools (SolidWorks, Creo, Inventor) and FEA software (ANSYS, Abaqus).
- Strong knowledge of metal fabrication processes including welding, sheet metal forming, and machining is a must
- Experience with structural design for heavy equipment or large assemblies, and familiarity with thermal and airflow considerations in enclosure design is required
- Excellent communication and cross-functional collaboration skills
Knowledge, Skills, Abilities:
- Excellent interpersonal and communication skills
- Creative, self-motivated, accountable, and team-oriented
- Able to work independently with minimal oversight
- Proficient in reading, analyzing, and interpreting general business publications, professional journals, technical procedures, and government regulations
- Skilled in writing reports, business correspondence, and procedural guides
- Effective at presenting information and responding to management, clients, and public queries
- Capable of influencing others and sharing best practices
- Comfortable working as part of a global team
- Capable of assessing projects, articulating risks, and developing project milestones
- Familiar with stage-gate processes in project lifecycle management (PLCM)
- Able to mentor less experienced engineers
- Ability to travel both domestically and internationally up to 30%
Preferred Qualifications:
- Master’s Degree in Mechanical Engineering
- Experience designing mechanical systems for data centers, telecom, or industrial power/cooling products.
- Active Professional Engineer (PE) license.
- Knowledge of regulatory and safety standards applicable to data center infrastructure.
- Hands-on experience with prototype fabrication and testing; Experience working with global suppliers and contract manufacturers a plus
Remote working/work at home options are available for this role.
Job Family: Mechanical Design Engineering
Organization: Data Center Infrastructure Team
Location: Remote* OR Austin, TX
*Requires up to 20% domestic and/or international travel (rare)
How will you make an impact?
We are seeking a highly skilled, technically proficient and detail-oriented Principal Mechanical Engineer with expertise in metal structures, frame design, pipes and fabrication to support the development of power and cooling infrastructure for data centers. This role is critical in designing robust mechanical systems that house and support electrical and thermal management equipment, ensuring structural integrity, manufacturability, and compliance with industry standards.
What will you do?
- Experience designing and integrating hydronic systems including pumps, piping networks, valves, and heat exchangers for data center cooling applications.
- Knowledge of fluid dynamics, pressure drop calculations, and pipe sizing for chilled water and glycol-based systems.
- Understanding of installation constraints, maintenance access, and serviceability in large-scale mechanical infrastructure.
- Design and develop mechanical frames, enclosures, and support structures for data center power and cooling products (UPS systems, battery racks, CRAC units, containment systems, LVS, MVS).
- Perform advanced structural analysis using FEA tools to validate mechanical integrity under static, dynamic, seismic, and thermal loads.
- Analyze load paths, stress concentrations, and fatigue life of structural components to ensure long-term reliability.
- Design metal enclosures with considerations for airflow, thermal containment, EMI shielding, and environmental protection.
- Evaluate and implement new materials, coatings, and fabrication technologies to enhance product performance and reliability.
- Participate in customer engagements and site visits to understand deployment constraints and gather feedback for design improvements.
- Create detailed CAD models and fabrication drawings, including weldments, sheet metal, and machined parts
- Select appropriate materials and fabrication methods to optimize cost, performance, and reliability
- Collaborate with electrical, thermal, and systems engineering teams to integrate mechanical designs with functional components.
- Lead mechanical design reviews and contribute to cross-functional design validation efforts.
- Develop and maintain design documentation including BOMs, specifications, test plans, and engineering change orders (ECOs).
- Drive continuous improvement in mechanical design for manufacturability (DFM), cost reduction, and performance optimization.
- Interface with suppliers and customers to resolve fabrication issues and ensure quality standards are met.
- Support lifecycle management of mechanical components, including obsolescence planning and alternate sourcing.
- Conduct root cause analysis and corrective actions for mechanical failures or field issues.
- Ensure mechanical designs support airflow management, thermal containment, and integration with cooling systems (in-row cooling, rear door heat exchangers).
- Collaborate with compliance and certification teams to ensure mechanical designs meet global regulatory requirements (UL, CE, RoHS, REACH)
- May perform other duties and responsibilities as assigned
How will you get here?
Education:
- Bachelor’s Degree in Mechanical Engineering or related engineering discipline.
Experience:
- 8+ years of experience in mechanical design and fabrication, preferably in data center, industrial, or power systems environment.
- Proficiency in CAD tools (SolidWorks, Creo, Inventor) and FEA software (ANSYS, Abaqus).
- Strong knowledge of metal fabrication processes including welding, sheet metal forming, and machining is a must
- Experience with structural design for heavy equipment or large assemblies, and familiarity with thermal and airflow considerations in enclosure design is required
- Excellent communication and cross-functional collaboration skills
Knowledge, Skills, Abilities:
- Excellent interpersonal and communication skills
- Creative, self-motivated, accountable, and team-oriented
- Able to work independently with minimal oversight
- Proficient in reading, analyzing, and interpreting general business publications, professional journals, technical procedures, and government regulations
- Skilled in writing reports, business correspondence, and procedural guides
- Effective at presenting information and responding to management, clients, and public queries
- Capable of influencing others and sharing best practices
- Comfortable working as part of a global team
- Capable of assessing projects, articulating risks, and developing project milestones
- Familiar with stage-gate processes in project lifecycle management (PLCM)
- Able to mentor less experienced engineers
- Ability to travel both domestically and internationally up to 30%
Preferred Qualifications:
- Master’s Degree in Mechanical Engineering
- Experience designing mechanical systems for data centers, telecom, or industrial power/cooling products.
- Active Professional Engineer (PE) license.
- Knowledge of regulatory and safety standards applicable to data center infrastructure.
- Hands-on experience with prototype fabrication and testing; Experience working with global suppliers and contract manufacturers a plus
Remote working/work at home options are available for this role.
Job Family: Mechanical Design Engineering
Organization: Data Center Infrastructure Team
Location: Remote* OR Austin, TX
*Requires up to 20% domestic and/or international travel (rare)
How will you make an impact?
We are seeking a highly skilled, technically proficient and detail-oriented Principal Mechanical Engineer with expertise in metal structures, frame design, pipes and fabrication to support the development of power and cooling infrastructure for data centers. This role is critical in designing robust mechanical systems that house and support electrical and thermal management equipment, ensuring structural integrity, manufacturability, and compliance with industry standards.
What will you do?
- Experience designing and integrating hydronic systems including pumps, piping networks, valves, and heat exchangers for data center cooling applications.
- Knowledge of fluid dynamics, pressure drop calculations, and pipe sizing for chilled water and glycol-based systems.
- Understanding of installation constraints, maintenance access, and serviceability in large-scale mechanical infrastructure.
- Design and develop mechanical frames, enclosures, and support structures for data center power and cooling products (UPS systems, battery racks, CRAC units, containment systems, LVS, MVS).
- Perform advanced structural analysis using FEA tools to validate mechanical integrity under static, dynamic, seismic, and thermal loads.
- Analyze load paths, stress concentrations, and fatigue life of structural components to ensure long-term reliability.
- Design metal enclosures with considerations for airflow, thermal containment, EMI shielding, and environmental protection.
- Evaluate and implement new materials, coatings, and fabrication technologies to enhance product performance and reliability.
- Participate in customer engagements and site visits to understand deployment constraints and gather feedback for design improvements.
- Create detailed CAD models and fabrication drawings, including weldments, sheet metal, and machined parts
- Select appropriate materials and fabrication methods to optimize cost, performance, and reliability
- Collaborate with electrical, thermal, and systems engineering teams to integrate mechanical designs with functional components.
- Lead mechanical design reviews and contribute to cross-functional design validation efforts.
- Develop and maintain design documentation including BOMs, specifications, test plans, and engineering change orders (ECOs).
- Drive continuous improvement in mechanical design for manufacturability (DFM), cost reduction, and performance optimization.
- Interface with suppliers and customers to resolve fabrication issues and ensure quality standards are met.
- Support lifecycle management of mechanical components, including obsolescence planning and alternate sourcing.
- Conduct root cause analysis and corrective actions for mechanical failures or field issues.
- Ensure mechanical designs support airflow management, thermal containment, and integration with cooling systems (in-row cooling, rear door heat exchangers).
- Collaborate with compliance and certification teams to ensure mechanical designs meet global regulatory requirements (UL, CE, RoHS, REACH)
- May perform other duties and responsibilities as assigned
How will you get here?
Education:
- Bachelor’s Degree in Mechanical Engineering or related engineering discipline.
Experience:
- 8+ years of experience in mechanical design and fabrication, preferably in data center, industrial, or power systems environment.
- Proficiency in CAD tools (SolidWorks, Creo, Inventor) and FEA software (ANSYS, Abaqus).
- Strong knowledge of metal fabrication processes including welding, sheet metal forming, and machining is a must
- Experience with structural design for heavy equipment or large assemblies, and familiarity with thermal and airflow considerations in enclosure design is required
- Excellent communication and cross-functional collaboration skills
Knowledge, Skills, Abilities:
- Excellent interpersonal and communication skills
- Creative, self-motivated, accountable, and team-oriented
- Able to work independently with minimal oversight
- Proficient in reading, analyzing, and interpreting general business publications, professional journals, technical procedures, and government regulations
- Skilled in writing reports, business correspondence, and procedural guides
- Effective at presenting information and responding to management, clients, and public queries
- Capable of influencing others and sharing best practices
- Comfortable working as part of a global team
- Capable of assessing projects, articulating risks, and developing project milestones
- Familiar with stage-gate processes in project lifecycle management (PLCM)
- Able to mentor less experienced engineers
- Ability to travel both domestically and internationally up to 30%
Preferred Qualifications:
- Master’s Degree in Mechanical Engineering
- Experience designing mechanical systems for data centers, telecom, or industrial power/cooling products.
- Active Professional Engineer (PE) license.
- Knowledge of regulatory and safety standards applicable to data center infrastructure.
- Hands-on experience with prototype fabrication and testing; Experience working with global suppliers and contract manufacturers a plus
Remote working/work at home options are available for this role.