Engineering Jobs in Oakbrook Terrace, IL

Job Description: Sr. Project Manager

Reports To: Director of Operations

FLSA: Exempt

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

Company Overview

Admiral Heating has been a trusted leader in commercial and industrial HVAC solutions in the Chicagoland area for over 70 years. Specializing in union construction projects and service work, we partner with contractors, developers, and building owners to deliver custom engineered heating, ventilation, and air conditioning solutions. Our reputation is built on quality workmanship, deep industry relationships, and a commitment to long-term customer success.

Admiral Heating operates on EOS (Entrepreneur Operating System). Our Core Values which we require all employees to exemplify are: Safety and Quality First, Intensely Diligent, Own it!, Innovative Approach, Proudly Humble of our Reputation and Exceed Expectations.

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

Job Duties and Responsibilities:

• Preparation of project budget based on the takeoff estimate
• Plan, organize and manage the construction project in all areas from start to successful completion including contract proposal, budget, change orders, materials procurement, billing, and collection.
• Comply with project contract including legal notifications, scope administration, change order procedures, billing, contract schedules, claims procedures and other contract requirements.
• Responsible for cost management. Monitor efficiency and production for compliance with labor budget.
• Work with field and others on the project team to maintain project tracking and reporting to ensure work progress and budget compliance.
• Control, collect and disseminate all project documentation.
• Maintain professional and timely communication with the general contractor, design team, owner, subcontractors, various company divisions and other key participants.
• Ensure the procurement of major equipment and fixtures
• Assure that all production meets quality control standards. Protect and mitigate liability.
• Support and participate in the company safety program.
• Take off, estimate and Formulate change order requests in a timely and efficient manner and updated internal budgets.
• Proactively manage construction costs to promote the overall projects success
• Communicate with management, vendors, and construction team as necessary.
• Responsible for ensuring project management team delivers projects within estimated gross profit
• Assist estimating team as requested

Qualifications, Competencies, & Abilities:

• Structure and content of the English language including the meaning and spelling of words, rules of composition, and grammar.
• Excellent time management and organizational skills.
• Self-Motivated, with the ability to work with little or no supervision.
• Strong level of attention to detail.
• Use logic and reasoning to identify the strengths and weaknesses of alternative solutions, conclusions or approaches to problems.
• Excellent interpersonal skills, and the ability to communicate information and ideas both verbally and written so others will understand.
• Ability to manage and prioritize multiple projects and deadlines.
• Work and communicate effectively with individuals at all levels, including executives.

Physical Demands and Working Environment:

The conditions herein are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential job functions.

• Environment: Work is performed primarily in a standard office environment.
• Physical: Primary functions require sufficient physical ability and mobility to work in an office setting; to stand or sit for prolonged periods of time; to occasionally stoop, bend, kneel, crouch, reach, and twist; to lift, carry, push, and/or pull light to moderate amounts of weight; to operate office equipment requiring repetitive hand movement and fine coordination including use of a computer keyboard; to travel to other locations using various modes of private and commercial transportation; and to verbally communicate to exchange information.
• Vision: See in the normal visual range with or without correction.
• Hearing: Hear in the normal audio range with or without correction.

Education and Experience:

• Bachelor’s degree in project management, engineering, finance or business from an accredited college or university or associate’s in business or accounting preferred.
• Fluent with Microsoft Office Suite.
• 7 Plus Years’ experience in related industry or Project Management field is preferred
• Extensive knowledge of HVAC, Duct work and piping

Compensation & Benefits

• Base Salary range $120,000 - $180,000
• Bonus and Profit Sharing up to 30% of base salary
• Fidelity 401k Plan with all fees paid by Admiral
• 401k Safe Harbor Match of 4%
• BCBS PPO and HMO Health Insurance Options (Admiral pays 75%)
• Dental and Vision Plans (Admiral pays 75%)
• Tuition Reimbursement
• Generous PTO Policy
• Paid Holiday’s
• 100% Admiral paid Long and Short Term and Short
• $20,000 Admiral Paid Life Insurance
• Flexible Spending and Dependent Care Accounts
• Employee Assistance Plan
• CTA and Parking Reimbursement
• Employee events throughout the year

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

This job description does not list all the duties of the job. You may be asked by managers to perform other instructions and duties. This job description may be revised from time to time and does not constitute a contract for employment.

Company Description

Nesko Electric Company is a privately held, state-licensed engineering and contracting firm located in Broadview, IL. The company specializes in design/build projects such as medical, industrial, houses of worship, primary and secondary education, commercial, and institutional projects.

Role Description

This is a full-time on-site role for an Electrical Estimator. The Electrical Estimator will be responsible for day-to-day tasks related to estimating costs, controlling costs, and managing electrical contracting projects.

Qualifications

• Expertise in Electrical Estimating and Cost Control. (5 Years Minimum)
• Experience in Electrical Contracting and/or Electrical Engineering
• Strong understanding of Electricity and Electrical Systems
• Bachelor's degree in Electrical Engineering or related field preferred
• Excellent communication and organizational skills
• Ability to manage multiple projects and deadlines
• Strong attention to detail and ability to work independently
• Experience in the construction or electrical industry is a plus

About Us: 

Go2 Logistics has been delivering reliable freight transportation and logistics services to companies of all sizes for over a decade. Committed to quality, safety, and reliability, Go2 has built a strong reputation among its valued clients, who depend on the timely and precise delivery of their shipments. With multiple terminals across the country, Go2 Logistics is able to offer top-tier logistics solutions. Our services include refrigerated LTL, dry LTL, dedicated truckloads, air freight, intermodal, as well as warehousing and cold storage.

Job Summary:

The Safety Coordinator is responsible for promoting and maintaining a safe work environment across all operations within the freight logistics company. This role ensures compliance with federal, state, and local safety regulations, company policies, and industry best practices. The Safety Coordinator works closely with drivers, warehouse personnel, and management to prevent accidents, reduce risk, and enhance safety culture.

Key Responsibilities:

·        Monitor and enforce company-wide safety programs and policies, ensuring driver and employee compliance with industry regulations.

·        Conduct regular safety audits, inspections, and risk assessments across terminals, warehouses, and transportation operations.

·        Investigate accidents, incidents, and near-misses, and develop corrective action plans to prevent recurrence.

·        Ensure compliance with OSHA, DOT, FMCSA, and other relevant federal and state regulations.

·        Maintain and update safety records, reports, and documentation for management review and regulatory compliance.

·        Deliver safety training programs to drivers, warehouse staff, and other personnel, including defensive driving, hazard recognition, and emergency procedures.

·        Assist in developing emergency response procedures and ensure all employees are aware of protocols.

·        Collaborate with HR, operations, and management teams to address safety concerns and implement improvements.

·        Track safety performance metrics and report trends, recommendations, and progress to management.

·        Promote a proactive safety culture and continuous improvement across all departments.

Qualifications:

·        Bachelor’s degree in Occupational Safety, Logistics, Industrial Engineering, or related field preferred.

·        2+ years of experience in safety coordination, preferably in freight, logistics, or transportation.

·        Knowledge of OSHA, DOT, FMCSA regulations, and industry best practices.

·        Strong analytical and problem-solving skills.

·        Excellent communication and training delivery skills.

·        Ability to work independently and collaboratively with diverse teams.

·        Proficient in Microsoft Office Suite and safety management software.

What We Offer:

·        Competitive salary and comprehensive benefits package including health, dental, vision, legal, STD, LTD, and pet insurance. Company-paid dental, vision, and life insurance for employees.

·        Opportunities for career growth and advancement within a growing company.

• ·        A supportive, collaborative, and dynamic work environment that encourages innovation and teamwork.

The Project Manager at RWE Design Build is responsible for planning, coordinating, and overseeing veterinary clinic construction projects from conception to completion. This includes budgeting, scheduling, ensuring compliance with safety and building regulations, and managing project teams.

Responsibilities:

• Responsible for planning, executing, and completing construction projects on time and within budget, while ensuring adherence to quality and safety standards.
• Overseeing the entire project lifecycle, from pre-construction planning to project closeout.
• Developing and managing project schedules, budgets, and resource allocation.
• Collaborating with architects, engineers, and subcontractors to ensure project specifications are met.
• Managing project documentation, permits, and regulatory compliance.
• Conducting regular site visits and inspections to monitor progress and identify potential issues.
• Resolving conflicts and issues that may arise during construction.
• Ensuring the safety of all personnel on the construction site.
• Communicating with stakeholders to provide project updates and address concerns.

Requirements:

• 4+ years of proven experience as a project manager (running projects independently)
• 4+ years of U.S. ground-up commercial experience
• Bachelor's degree in Construction Management, Engineering, Architecture, or related field preferred.
• Proficient in Procore & MS Project
• Familiarity with relevant building codes, regulations, and safety standards
• Willingness to travel to project sites regularly
• Ability to work under pressure and meet tight deadlines.
• Strong negotiation and contract management skills.
• Must be authorized to work in the United States without current or future employer sponsorship.

Benefits:

• Health/Dental/Vision insurance
• 401k with company match
• Long-term/short-term disability
• Life Insurance
• PTO
• Paid holidays

Recruiter/Agency Policy:

RWE Design Build is not accepting submissions from outside recruiters or staffing agencies for this position. Any unsolicited resumes sent to RWE Design Build or its employees will be considered the property of RWE Design Build, and no placement fees will be paid.

Summary

The Project Scheduler is responsible for developing, maintaining, and analyzing construction schedules to support successful project execution across all phases of electrical construction projects. This role partners with project managers, field leadership, and construction operations teams to identify critical path activities, monitor progress, and proactively address schedule risks. By providing accurate forecasting, productivity analysis, and schedule reporting, the Project Scheduler enables informed decision-making to help ensure projects are completed on time and within budget.

What you’ll do:

Schedule Development and Management

• Develop, implement, and maintain detailed construction schedules using Primavera P6 (or similar).

• Collaborate with project managers and field teams to gather schedule inputs related to material procurement, labor planning, and installation sequencing.

• Identify and manage critical path activities to support timely execution of project milestones.

• Process schedule updates, revisions, and logic changes as projects evolve.

• Document scheduling processes and maintain accurate schedule records.

Project Timeline Coordination and Analysis

• Define sequencing and methods of work for electrical installations within the overall construction schedule.

• Monitor project timelines, milestones, and deliverables to track performance against plan.

• Identify potential schedule constraints, delays, and labor impacts, and assist with mitigation strategies.

• Prepare progress updates, look-ahead schedules, and manpower projections to support forecasting and planning.

Reporting and Productivity Insights

• Analyze field installation data to identify trends, productivity impacts, and schedule variances.

• Prepare and distribute schedule and progress reports to project teams and construction leadership.

• Prepare and present succinct schedule summaries with potential risks for executive management.
• • Support construction operations with forecasting tools that enable proactive planning and resource allocation.

Communication and Collaboration

• Maintain frequent, open communication with project teams, general foremen, and project delivery partners.

• Keep stakeholders informed of schedule status, key milestones, and risks.• Support project teams in making data-driven decisions related to schedule and execution.

What you’ll need:

• Bachelor’s degree in Construction Management, Engineering, or a related field required.
• • Minimum of 3 years of experience as a Project Scheduler in construction or a related industry.
• • Intermediate to advanced proficiency in Primavera P6 or similar project scheduling software.
• • Demonstrated experience developing and managing schedules for large, multi-phase construction projects.
• • Solid knowledge of electrical construction; data center construction experience preferred.
• • Strong analytical skills with the ability to interpret schedule data and identify trends.
• • Excellent organizational, time-management, communication, and collaboration skills.
• • Proactive, detail-oriented mindset with the ability to influence project outcomes.

Certifications (Preferred)

• PMI Scheduling Professional (PMI-SP) certification preferred.

• Certified Associate in Project Management (CAPM) preferred.

Physical Demands

• Work performed in both office and active construction site environments.

• Occasional site visits to local Chicagoland jobsites.

• Ability to sit, stand, and walk for extended periods during office and field activities.

Founded in 1912, Continental Electrical Construction Company is the number one electrical construction company in Chicago and its suburbs, as well as one of the largest in the Midwest. Dozens of landmark structures bear our imprint. From high rises to health care facilities, factories to financial centers, data centers to educational facilities, hotels to recreational and shopping centers, Continental satisfies all electrical construction needs.

Working for Continental Electrical Construction provides:

• Assistance, tools, and resources for success

• A collaborative, engaging, and respectful workplace

• Fulfilling career opportunities and skills development

• A values-based working environment:

E: Everyone United

N: Nurture Communication

E: Enforce Accountability

R: Relationships Matter

G: Growth and Development

Y: You Make the Difference

Continental Electrical Construction offers a competitive salary that may vary based on the scope and responsibilities of the role and the candidate’s relevant experience, education, and skills. We also offer a comprehensive benefits program including medical, dental, and vision insurance; 401(k) with company match; profit sharing; retirement benefits; company-provided life and disability insurance; generous paid time off; paid holidays; parental leave; volunteer time off; tuition assistance; Employee Assistance Program; and company-subsidized wellness programs.

Continental Electrical Construction is an equal opportunity employer and does not discriminate in employment on the basis of race, color, religion, national origin, citizenship status, ancestry, age, gender, gender identity, sexual orientation, marital status, pregnancy, physical or mental disability, military status, arrest or conviction record, source of income, or credit history.

The objective of the Senior Project Manager is to lead and mentor project teams, serve as a trusted partner to customers, and oversee the successful planning, design, procurement, and execution of electrical construction projects while meeting schedule, budget, and quality objectives.

Essential Duties

• Plan, prepare and/or review technical specifications, contract documents, and estimates
• Review electrical drawings and specifications for lighting, power distribution, data/voice cabling, special systems, and fire alarm systems
• Responsible for total management of multiple complex and/or large-scaled projects over a $5M+ threshold from time of assignment to turnover of operations
• Expected to manage an aggregate of $15M+ in billings annually
• Interact with Customers, Vendors, Field and Engineering teams to ensure project is completed on schedule and within budget
• Work with superintendents and foremen to plan, organize, and direct activities related to projects
• Conduct site visits to identify and solve problems and verify that construction is proceeding in accordance with design specs
• Provide mentorship and guidance to Junior Project Management team
• Continually seeks opportunities to increase customer satisfaction and develop lasting relationships

Qualifications

• Bachelor of Science degree in Electrical or Mechanical Engineering; or Field experience preferred
• 8+ years Project Management experience
• Experience with oversight of $5M+ in Contract Value
• Effectively lead and mentor Junior Project Management employees
• Customer relationship-oriented
• Strong time management and organizational skills
• Ability to meet critical deadlines
• Ability to be self-motivated, proactive, and an effective team player

As a Project Manager II with Graycor Construction Company, you will have the authority to drive successful project results, moving your projects from preconstruction through final closeout in the safest manner possible while maintaining the highest quality standards.

AS A PROJECT MANAGER II, YOU WILL HAVE THE OPPORTUNITY TO:

• Ensure all safety compliance and quality programs are being executed on the project site. Safety is one of our core values.
• Actively participate in bidding and pre-construction services.
• Represent Graycor as the client’s primary contact. Openly and confidently communicate with all other parties involved with the project, establishing trust and rapport with owners, architects, engineers, and subcontractors.
• Manage the performance of the professional support personnel on the project site. This typically includes a Project Engineer or Assistant Project Manager, Field Superintendents, and administrative staff.
• Maintain strict control over the budget and keep project on schedule, ensuring ongoing profitability.
• Execute subcontracts and purchase orders, and approve subcontractor invoices and change requests. Negotiate contract changes with the client. Complete close-out requirements for projects and collect final payment.
• Mentor and train Project Engineers and Assistant Project Managers to ensure their ongoing career growth and development.
• Implement new ideas. Be an active member and leader within the Graycor Construction Company, actively participating in committees, make recommendations for new initiatives, and embrace new policies related to Safety, Quality, Continuous Improvement Programs, Lean Construction, and Zero Punch Lists.

TO BE A SUCCESSFUL IN THIS ROLE, YOU WILL NEED:

• A minimum of seven (7) years of relevant construction operations experience, with experience managing distribution center and/or light industrial manufacturing construction projects.
• A bachelor degree, preferably in construction management, engineering or a related field.
• Ability and willingness to travel up to 20%.
• The desire to succeed. Our best Project Managers are strong leaders—self-starters who drive excellence and meet high standards.
• Effective communication skills to motivate your team, delegate tasks, and present proposals to clients with competence and confidence.
• The fortitude to juggle competing priorities in a fast-paced environment. Multi-tasking with a sense of urgency while maintaining strong attention to detail and accuracy is crucial.
• Ability to construct a critical path project schedule using scheduling software. We use Primavera v6.

WHY JOIN OUR GROWING, DYNAMIC TEAM?

Building Your Future is How We Build Ours. At Graycor, we seek out those with the highest potential and provide an empowering environment with tools that allow you to take ownership in your career development.

Stability Means Staying Ahead of the Curve. Graycor is committed to continuous improvement and reinvesting in evolving technologies. To ensure stability, we have a diversified project portfolio in a broad range of niche markets nationwide.

We Are Family. This is why we have an intense commitment to Safety. We want to make sure that every member of our Graycor family goes home each day to theirs. Our family-owned company also sponsors wellness and charitable events, casual employee get-togethers, lunch and learns, and other fun social events.

Our Greatest Asset? Our Name. Reputation is grown over time. Our dedication to our people and building trust has enabled us to cultivate long-term relationships with each other, our clients, and our partners.

Join the Graycor Family of Companies.

We’re Building Something More.

ABOUT THE GRAYCOR FAMILY OF COMPANIES

Established in 1921, the Graycor Companies provide General Contracting and Construction Management services to a wide variety of industrial and commercial construction markets across the US, Canada and Mexico. As a top ranking industry leader, Graycor commits to safe working environments, demands excellence and rewards passion.

As a diversified leader, we offer a competitive salary and comprehensive benefits package.

For more information, visit our website at Graycor family of companies is an Equal Employment Opportunity employer

Project Engineer – Commercial Construction

Location: Western Suburbs

Salary: $65k-$75k

Position Summary

Our client is a smaller but dynamic GC / CM delivering high quality commercial construction projects around Chicagoland. They value collaboration, integrity, innovation, and client satisfaction. We’re seeking a motivated Project Engineer to support project teams and help ensure builds are delivered on time, on budget, and with the highest standards of quality.

Key Responsibilities

• Review construction drawings, specifications, and contract documents to understand scope and identify any gaps or discrepancies.
• Support material, labor, and equipment take-offs, assist with quantity verification and preliminary cost estimates.
• Support scheduling: help develop and maintain project schedules, track progress, and coordinate with subcontractors, vendors, and design/engineering teams to keep work aligned.
• Manage project documentation: maintain logs for RFIs, submittals, change orders, subcontracts, permits, and daily/weekly reports.
• Assist with cost control: track costs vs. budget, monitor change-order requests, support procurement, and help forecast cost-to-complete estimates.
• Facilitate communication among all stakeholders — owners, architects/engineers, subcontractors, trade-partners, and internal team members — to ensure collaboration and smooth workflow.
• Support quality assurance and compliance: verify that work adheres to project specifications, safety standards, and regulatory requirements.
• Participate in project meetings, site visits, inspections, and coordinate close-out documentation at project completion.

Qualifications & Skills

• Bachelor’s degree in Construction Management, Civil/Structural Engineering, or related field; or equivalent experience.
• 1-3 years of experience in commercial construction, general contracting, or construction management, preferably with exposure to estimating, takeoffs, and subcontractor coordination.
• Strong ability to read and interpret construction drawings, plans, and specifications.
• Proficiency with construction management and documentation tools/software (e.g., Procore, Bluebeam) and Microsoft Office.
• Excellent organizational, communication, and problem-solving skills. Ability to coordinate multiple tasks and stakeholders simultaneously.
• Detail-oriented with a strong sense of accountability for budget, schedule, and quality.
• Team-oriented mindset and ability to thrive in a collaborative environment.

What You’ll Get Working Here

• Base salary from $65k-$75k, performance bonuses, 401k
• Diverse portfolio of interesting and complex projects
• A collaborative, professional work environment built on strong relationships with subcontractors, owners, and design professionals.
• Unlimited growth potential with a clear path to APM and beyond

Job Description: Licensed Professional HVAC Design Engineer

Reports To: President

FLSA: Exempt

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

Company Overview

Admiral Heating has been a trusted leader in commercial and industrial HVAC solutions in the Chicagoland area for over 70 years. Specializing in union construction projects and service work, we partner with contractors, developers, and building owners to deliver custom engineered heating, ventilation, and air conditioning solutions. Our reputation is built on quality workmanship, deep industry relationships, and a commitment to long-term customer success.

Admiral Heating operates on EOS (Entrepreneur Operating System). Our Core Values which we require all employees to exemplify are: Safety and Quality First, Intensely Diligent, Own it!, Innovative Approach, Proudly Humble of our Reputation and Exceed Expectations.

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

Job Duties and Responsibilities:

• Develop, review, and approve mechanical system designs for HVAC systems.
• Prepare and certify engineering drawings, technical specifications, and calculations in accordance with applicable standards and regulations.
• Conduct system load analyses, equipment selections, and energy performance evaluations.
• Oversee all phases of project development from concept through construction completion.
• Coordinate with multidisciplinary teams including architectural, electrical, civil, and structural engineering professionals.
• Perform field inspections and provide technical support during construction and commissioning.
• Ensure all designs comply with state and local building codes, ASHRAE, IMC, and NFPA standards.
• Provide technical guidance, mentorship, and quality assurance oversight for junior engineering staff.
• Participate in project meetings, client presentations, and design reviews.
• Maintain a current understanding of emerging technologies, materials, and industry trends relevant to mechanical systems design

Qualifications, Competencies, & Abilities:

• Extensive knowledge of mechanical systems and the ability to design commercial HVAC, duct, and piping systems.
• Proficiency in HAP and E20 software.
• Strong knowledge of AutoCAD and ability to prepare and review detailed drawings.
• Experience in design-build delivery, construction administration, or BIM coordination.
• LEED accreditation or demonstrated experience with sustainable design practices.
• Excellent command of the English language, including grammar, spelling, and written composition.
• Exceptional organizational and time management skills.
• Self-motivated, with the ability to work independently and manage multiple priorities.
• Strong attention to detail and analytical problem-solving skills.
• Effective interpersonal and communication skills, both verbal and written.
• Ability to work collaboratively with individuals at all levels of the organization, including executives.

Physical Demands and Working Environment:

The conditions herein are representative of those that must be met by an employee to successfully perform the essential functions of this job. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential job functions.

• Environment: Work is performed primarily in a standard office environment.
• Physical: Primary functions require sufficient physical ability and mobility to work in an office setting; to stand or sit for prolonged periods of time; to occasionally stoop, bend, kneel, crouch, reach, and twist; to lift, carry, push, and/or pull light to moderate amounts of weight; to operate office equipment requiring repetitive hand movement and fine coordination including use of a computer keyboard; to travel to other locations using various modes of private and commercial transportation; and to verbally communicate to exchange information.
• Vision: See in the normal visual range with or without correction.
• Hearing: Hear in the normal audio range with or without correction.

Education and Experience:

• Bachelor’s degree in Mechanical Engineering MEP
• Active Professional Engineer (PE) license in the State of Illinois
• Fluent with Microsoft Office Suite.
• 7 Plus Years’ experience minimum, 10 Plus preferred
• Extensive knowledge of HVAC, duct work and piping
• Proficiency in HAP, E20, and AutoCAD suite software

Compensation and Benefits

• Base Salary Range $120,000 - $180,000
• Bonus and Profit Sharing up to 30% of base salary
• Fidelity 401k Plan with all fees paid by Admiral
• 401k Safe Harbor Match of 4%
• BCBS PPO and HMO Health Insurance Options (Admiral pays 75%)
• Dental and Vision Plans (Admiral pays 75%)
• Tuition Reimbursement
• Generous PTO Policy
• Paid Holiday’s
• 100% Admiral paid Long and Short Term and Short
• $20,000 Admiral Paid Life Insurance
• Flexible Spending and Dependent Care Accounts
• Employee Assistance Plan
• CTA and Parking Reimbursement
• Employee events throughout the year

IF INTERESTED IN THIS POSITION, PLEASE EMAIL RESUME TO:

This job description does not list all the duties of the job. You may be asked by managers to perform other instructions and duties. This job description may be revised from time to time and does not constitute a contract for employment.