Engineering Jobs in South Gate, CA

About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We're designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

Operations Engineer

As an Operations Engineer, you will be the heartbeat of schedule execution for Castelion's hypersonic weapons development. You will architect and maintain integrated master schedules that span concept design, engineering development, hardware production, flight test, and operational deployment. Working across engineering, manufacturing, and government-program stakeholders, you will keep aggressive timelines on track and ensure that every milestone is grounded in technical reality.

This role demands a strategic thinker who is equally comfortable with hands-on execution and thrives in a dynamic startup environment. This person can bring order to complexity while supporting multiple high-stakes government programs.

Responsibilities

• Integrated Master Scheduling: Build and maintain end-to-end schedules from early design through full-rate production and fielding of hypersonic weapon systems.
• Critical Path Management: Identify dependencies, risks, and recovery options to keep programs aligned with contractual commitments and customer milestones.
• Cross-Functional Coordination: Partner with engineering leads, program managers, and operations teams to ensure schedule accuracy and timely updates.
• Data-Driven Insights: Develop tools, dashboards, and reports that provide real-time visibility to leadership and government customers.
• Process Improvement: Gain deep understanding of Castelion's engineering and manufacturing workflows to drive schedule fidelity and continuous improvement.
• Rapid Response: Lead high-tempo reviews, update schedules in response to evolving priorities, and escalate risks before they become blockers.
• Customer Interface: Provide schedule briefings and status updates to U.S. Government stakeholders, supporting formal reviews and contractual reporting

Basic Qualifications

• Bachelors degree in engineering, operations management, business, or a related technical field.
• 3+ years of experience in project planning, integrated master scheduling, or operations engineering.
• Proficiency with Smartsheet, Microsoft Project, Primavera, or comparable scheduling tools.
• Strong grasp of critical-path analysis, risk assessment, and work breakdown structures.
• Demonstrated ability to manage multiple complex projects in a fast-paced, cross-functional environment.
• Exceptional attention to detail and clear written and verbal communication skills.

Preferred Skills and Experience

• Experience with first-of-a-kind engineering projects or defense hardware production.
• Familiarity with hypersonic or missile-system development life cycles.
• Background in government acquisition programs and contractual reporting (e.g., CDRLs, IMS).
• Experience integrating third-party schedules and external supplier data into a master plan.
• Active Top Secret/SCI clearance.

All employees are granted long-term stock incentives as part of their employment at Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year.

Leadership Qualities

Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion's mission and consistently look for ways to contribute to the company's technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements:

• To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We design, build, and test next generation weapon systems to give America and its Allies a definitive edge in defense capabilities.

Automation and Controls Engineer

The Automation and Controls Engineer will design, build, and commission robust manufacturing systems for production of hypersonic-flight components.

Success requires a practical application of engineering principles to design, build, test, and commission process hardware, integrate new technologies into our production line, and integrate process equipment and technologies within our production line. We are seeking a hands-on problem solver with strong expertise in electro-mechanical system design and automation systems, as well as experience working with machinery and production environments.

The key to excelling in this position is the effective application of mechanical, electrical, and control systems expertise to enable our manufacturing processes.

Responsibilities

• Design, build, customize, and test hardware and control systems for integration into composite manufacturing equipment balancing process requirements, cost and leadtime considerations.
• Partner with mechanical, materials, and manufacturing engineering teams to align on hardware requirements and design solutions.
• Mature manufacturing processes via the implementation of process control systems and procedures to ensure production consistency and reliability.
• Work with suppliers and vendors to define specifications and ensure on-time delivery of equipment for production needs.
• Troubleshoot hardware malfunction issues to minimize downtime and improve operations.
• Provide guidance and implement robust plans for hardware maintenance and calibration to ensure reliable operation of the manufacturing equipment.

Basic Qualifications

• Bachelor’s degree in mechanical engineering, electrical engineering, aerospace engineering or industrial engineering.
• 2+ years of experience in a fast-paced aerospace, automotive, or manufacturing production environment.
• Experience identifying, trouble shooting and rectifying complex manufacturing issues involving multiple production resources in a deadline driven environment.
• Understanding of manufacturing processes (machining, welding, forming, composites).
• Strong mechanical aptitude and willingness to engage in hands-on work to test and implement ideas.
• CAD / CAM (Siemens NX).
• Computer Programming (Python, C, NodeJS, HTML, CSS).

Preferred Skills & Experience

• Master’s degree in mechanical engineering, electrical engineering, aerospace engineering or industrial engineering.
• 4+ years of experience in a fast-paced aerospace manufacturing and production environment.
• Automation (PLC programming, Industrial Robotics).
• CNC Machining.
• IoT / Connected factory concepts.
• Networking skills.

Leadership Qualities

• Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to work independently and resolve minor issues in development with minimal oversight and support.
• High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion’s mission and consistently look for ways to contribute to the company’s technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.
• Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements

• To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

All employees are granted long-term stock incentives as part of their employment at Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers four weeks of paid time off per year.

About Castelion

Castelion is bringing a new approach to defense development and production: one that focuses on short, iterative design cycles, rapid testing in development, and modern commercial manufacturing strategies for production at scale. We’re designing, building, and testing next generation long range strike weapons systems to give America and its Allies a definitive edge and deter future conflicts.

HIMARS Specialist

The HIMARS Specialist will serve as Castelion’s internal subject matter expert (SME) on HIMARS employment, operations, and tactical integration. This individual will translate firsthand operational experience into actionable guidance for engineering, manufacturing, testing, and customer engagement teams.

You will play a critical role in ensuring our systems are intuitive, survivable, rapidly employable, and aligned with how warfighters actually operate.

Responsibilities

• Serve as the internal SME on HIMARS operations, tactics, techniques, and procedures (TTPs)
• Provide operator-informed input into system architecture, human-machine interface (HMI), mobility concepts, and reload workflows
• Advise engineering teams on real-world constraints including crew ergonomics, field maintenance, deployment timelines, and survivability considerations
• Support design reviews to ensure operational realism is embedded in system decisions
• Participate in field tests, live fire events, and mobility demonstrations to evaluate usability and mission flow
• Assist Business Development and Program teams with customer engagement, CONOPS development, and operational briefings
• Develop training concepts and documentation rooted in real operational experience
• Identify capability gaps and improvement opportunities based on firsthand system use

Basic Qualifications

• Prior experience operating the M142 HIMARS in an operational military environment
• Deep understanding of HIMARS crew operations, mission planning, reload procedures, and fire mission execution
• Experience in deployed, training, or live-fire environments
• Ability to communicate operational insights clearly to engineering and technical teams
• Active U.S. security clearance or ability to obtain one

Preferred Skills and Experience

• Experience serving as Section Chief, Platoon Sergeant, Fire Direction Specialist, or similar leadership role
• Instructor or evaluator experience within a HIMARS unit
• Exposure to joint fires integration and coordination with higher-echelon fire control systems
• Familiarity with modern digital fire control and targeting workflows
• Experience supporting acquisition, test, or modernization efforts

All employees are granted long-term stock incentives as part of their employment as Castelion. All employees receive access to comprehensive medical, vision, and dental insurance, and the company offers three weeks of paid time off per year.

Leadership Qualities

Bias to Action and Creative Problem Solving. Desire and experience questioning assumptions in ways that lead to break through ideas that are ultimately implemented. Successfully bring in applicable processes/concepts/materials from other industries to achieve efficiency gains. Ability to personally resolve minor issues in development without requiring significant support.

High Commitment, High Initiative. A successful candidate will have a genuine passion for Castelion’s mission and consistently look for ways to contribute to the company’s technical goals and prevent hardware blockers. Ability to work in a fast paced, autonomously driven, and demanding atmosphere. Strong sense of accountability and integrity.

Clear Communicator. Proactively communicates blockers. Trusted in previous roles to be voice of company with regulators, suppliers, gate keepers and customers. Capable of tactfully managing relationships with stakeholders to achieve company-desired outcomes without compromising relationships. Emails, IMs and verbal interactions are logical, drive clarity, and detailed enough to eliminate ambiguity.

ITAR Requirements:

• To conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State.

Employment with Castelion is governed on the basis of competence and qualifications and will not be influenced in any manner by race, color, religion, gender, national origin/ethnicity, veteran status, disability status, age, sexual orientation, gender identity, marital status, mental or physical disability or any other legally protected status.

MECHANICAL ENGINEER OPENING IN COMPTON CA. WE ARE LOOKING FOR A STRONG MECHANICAL ENGINEER WHO COMES FROM A MANUFACTURING ENVIRONMENT. LOOKING FOR SOMEONE WITH AN ENGINEERING DEGREE AS WELL. MUST HAVE AT LEAST 10 YEARS EXPERIENCE AS WELL.

THIS IS 100% ONSITE ROLE IN THE MANUFACTURING PLANT AS WELL

SALARY: $150K-$200K NO BONUSPosition Overview

Key Responsibilities & Achievements

• Led the design, development, and validation of complex mechanical products, systems, and assemblies from concept through production release.
• Created and maintained detailed 3D models, assemblies, and manufacturing drawings using SolidWorks (Expert Level) for prototyping and full-scale production.
• Translated conceptual designs into manufacturable components, applying expertise in metals, plastics, soft goods, textiles, precision mechanisms, and integrated assemblies.
• Worked hands-on with prototypes and production components to validate fit, form, and function; conducted structured testing and verification activities.
• Performed FMEA, tolerance stack-up analysis, and validation testing to ensure reliability, safety, and regulatory compliance.
• Leveraged rapid prototyping and 3D printing processes to accelerate development cycles and validate design feasibility.
• Collaborated cross-functionally with design, manufacturing, supply chain, and quality teams to align engineering intent with production capabilities.
• Supported patent documentation and participated in intellectual property reviews for innovative mechanical designs.
• Identified and implemented process improvements, reducing manufacturing costs while enhancing product performance and durability.
• Ensured compliance with quality control standards, safety regulations, and ISO 9001 quality management systems.

Technical Expertise

• SolidWorks (Advanced Modeling, Complex Assemblies, GD&T, Drafting)
• Rapid Prototyping & Additive Manufacturing
• Precision Mechanisms & Mechanical Assemblies
• Injection Molding, Tooling, Machining, and Casting
• Metals & Plastics for Durable/Safety Equipment
• Reverse Engineering & Design Optimization
• ISO 9001 Quality Systems & Documentation
• Ergonomic & Industrial Design Principles
• Patent Documentation & Product Innovation

Core Competencies

• Advanced problem-solving and root cause analysis
• High attention to detail and organizational discipline
• Strong written and verbal communication skills
• Cross-functional leadership and collaboration
• Independent project execution and deadline accountability
• Commitment to product safety, precision engineering, and innovation

Job Description:

Distribution Center Design Lead/Architect (Industrial Engineering / Material Flow / Automation / Operations)

Role Summary:

We are seeking a hands‑on Conceptual Design Lead who can own and drive the creation of the future‑state operating model for our Client’s new distribution center. This role blends leadership and deep technical design, combining Industrial Engineering, Material Flow/Facility Design, Operations, and Automation experience to deliver a cohesive concept that defines capacity, flow, labor, and automation strategy. The ideal candidate is equally comfortable leading workshops, building models, mapping flows, structuring deliverables, and making executive‑level recommendations.

What You’ll Do

• Lead Phase 1 Conceptual Design, acting as the primary architect of the future‑state DC and the coordinator for all SMEs (Operations, IE, Strategy, Transportation, Automation, WMS/IT).
• Build the 5‑year demand/capacity model, including peak week/day/hour throughput, SKU cube/velocity analysis, and storage strategy.
• Design end‑to‑end material flows (inbound → putaway → storage → picking → packing → shipping → returns), aligning process engineering with automation options.
• Create the facility conceptual layout (zones, dock strategy, storage types, work areas) and define envelope requirements (clear height, bays, docks, space allowances).
• Evaluate automation strategies (AutoStore, Exotec, AMRs, traditional MHE), producing trade‑offs, sizing, and throughput scenarios.
• Partner with Operations SMEs to define service models, exception paths, staffing needs, and productivity assumptions.
• Work with Strategy & Transportation Analysts to align network role, transit expectations, and upstream/downstream constraints.
• Collaborate with WMS Architect & IT Integration Architect to define system capabilities, integration points, and functional requirements linked to flow design.
• Facilitate working sessions and drive the team toward a unified Phase 1 Concept Design Package including options, recommendations, risks, and CapEx/OpEx bands.
• Present conceptual alternatives and recommendations to senior leadership and support Stage Gate 1 approvals.

What You Bring

• 7+ years in Industrial Engineering, Material Flow Design, Automation Engineering, or Operations Design for distribution/fulfillment centers.
• Demonstrated ability to design DC flows from scratch and translate requirements into conceptual layouts and automation configurations.
• Experience working with or evaluating automation technologies such as AutoStore, Exotec, AMRs, conveyors, goods‑to‑person, or high‑density storage systems.
• Strong command of capacity modeling, process mapping, labor modeling, and storage/slotting logic.
• Proven ability to lead cross‑functional workshops, synthesize inputs from multiple SMEs, and deliver polished executive-level design deliverables.
• A “builder” mindset — comfortable rolling up your sleeves, doing the analysis, and also driving the broader team toward alignment.
• Ability to collaborate effectively with WMS/IT, Operations, Strategy, and Real Estate partners during early design.

Why This Role Matters

Phase 1 sets the foundation for the entire DC program, defining the operating model, automation direction, labor model, and facility envelope that flow into site selection, financial modeling, detailed design, TI, procurement, and go‑live.

We need a leader who can think strategically and produce high‑quality designs — someone who can be the center of gravity for the conceptual phase and ensure the right decisions are made early, with clarity and speed.

Who is Spinnaker SCA?

Spinnaker SCA, a Publicis Sapient company, is a supply chain consultancy purpose-built for today’s volatility and tomorrow’s opportunities. We design and deliver smarter supply chains using a hands-on blend of strategic thinking, digital systems know-how, and practical execution.

From network design and demand planning to warehouse automation and AI-powered analytics, we help companies design intelligently, implement seamlessly, and grow exponentially. If you’re ready to help rethink what supply chains can be—and have a little fun while doing it—we’d love to hear from you.