El Segundo, California, United States · On-site
$158k–$219k/yr
About Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can b…
Skills: Thermodynamic modeling, Systems engineering, Fluid dynamics, Power cycle design, Matlab
El Segundo, California, United States · On-site
$177k–$266k/yr
RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: Secret TRAVEL: Yes, 25% of the TimeDescription At Northrop Grumman, our employees have incredible opportunit…
Skills: Environmental Control Systems, Thermal Fluid Architecture, System Test & Verification, Subsystem Performance Modeling, Liquid Cooling Systems
El Segundo, California, United States · On-site
$134k–$190k/yr
About Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can b…
Skills: Supplier Quality Management, Supplier Qualification, Quality Auditing, Root Cause Analysis, Corrective Action Management
El Segundo, California, United States · On-site
$177k–$266k/yr
RELOCATION ASSISTANCE: Relocation assistance may be available CLEARANCE REQUIRED FOR START: Yes CLEARANCE TYPE: Secret TRAVEL: Yes, 25% of the TimeDescription At Northrop Grumman, our employees have incredible opportunit…
Skills: Flight Control Algorithms, Guidance Navigation and Control, Control Laws, Linear and Non-linear Dynamic Simulation, MATLAB
El Segundo, California, United States · On-site
$160k–$180k/yr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Flight Electronics Design, Avionics, PCB Design, Power Distribution Systems, Analog Circuit Design
El Segundo, California, United States · On-site
$190k–$250k/yr
CHAOS Industries is redefining modern defense with a multi-product portfolio that gives the ultimate advantage—domain dominance. The company's products are powered by Coherent Distributed Networks (CDN™), empowering warf…
Skills: Financial planning and analysis, Corporate planning, Scenario planning, Long-range modeling, Board reporting
El Segundo, California, United States · On-site
About Rivian Rivian is on a mission to keep the world adventurous forever. This goes for the emissions-free Electric Adventure Vehicles we build, and the curious, courageous souls we seek to attract. As a company, we con…
Skills: Vehicle diagnosis, Automotive repair, Electrical systems, High voltage systems, Chassis service
El Segundo, California, United States · Remote OK
$140k–$215k/yr
MANAGER / DIRECTOR, FINANCIAL PLANNING & ANALYSIS EL SEGUNDO, CA | MOORESVILLE, NC | OR FULLY REMOTE | FULL-TIME | REPORTS TO: CFO Cambium is a global company building the advanced materials base for reindustrialization …
Skills: Financial planning and analysis, Financial modeling, Strategic planning, KPI framework, Budgeting
El Segundo, California, United States · On-site
$178k–$245k/yr
As a global leader in semiconductor solutions in power systems and IoT, Infineon enables game-changing solutions for green and efficient energy, clean and safe mobility, as well as smart and secure IoT. Together, we driv…
Skills: Power electronics, DC-DC converter topologies, Magnetic components, Semiconductor characteristics, PCB layout
El Segundo, California, United States · On-site
$24/hr–$45/hr
Senior R&D Laboratory Technician – Formulation El Segundo, CA | Full-Time | On-Site Must be a U.S. Persons due to the nature of our work. Defense, aerospace, and other high-performance applications demand new material so…
Skills: Formulation, Resin mixing, Composite materials, Laboratory procedures, Analytical testing
El Segundo, California, United States · On-site
$90k–$95k/yr
Company Description CREATIVITY IS OUR SUPERPOWER. It’s our heritage and it’s also our future. Because we don’t just make toys. We create innovative products and experiences that inspire fans, entertain audiences and deve…
Skills: Mechanical Engineering, Product Development, SolidWorks, Creo, FEA
El Segundo, California, United States · On-site
$20/hr–$30/hr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Circuit Design, System Analysis, Troubleshooting, Prototyping, System Integration
El Segundo, California, United States · On-site
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Test engineering, Software testing, Test automation, Test planning, Troubleshooting
El Segundo, California, United States · On-site
$20/hr–$30/hr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Structural analysis, Mechanical engineering, Aerospace engineering, Structural engineering, Python
El Segundo, California, United States · On-site
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Project management, Aerospace engineering, Technical scheduling, Risk management, Microsoft Excel
El Segundo, California, United States · On-site
$30/hr–$42/hr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Mechanical Engineering, CAD, SolidWorks, Finite Element Analysis, FEA
El Segundo, California, United States · On-site
$20/hr–$30/hr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Manufacturing Engineering, 3D Modeling, SolidWorks, Analytical Skills, Problem Solving
El Segundo, California, United States · On-site
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Additive manufacturing, Mechanical engineering, Aerospace engineering, Electrical engineering, CAD
El Segundo, California, United States · On-site
$160k–$260k/yr
Amca is building America’s new industrial base. Since the 1990s, our ability to build new aviation and military systems and maintain the ones we already have has eroded. Today, the gap between what the nation needs to pr…
Skills: Electrical engineering, Aerospace hardware, Power electronics, Analog circuit design, Digital circuit design
El Segundo, California, United States · On-site
$85k–$115k/yr
A New Paradigm For Space Operations. Who We Are: Space Kinetic is a dual use space technology startup building a completely new architecture for space operations – one that brings the advantages of proliferated drone tec…
Skills: Procurement, Supplier Management, Material Planning, Inventory Management, ERP Systems
El Segundo, California, United States • On-site
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The engineer will own system-level thermodynamic performance modeling for nuclear power conversion architecture, including design and off-design operating conditions. They will also serve as the primary technical interface for control systems engineering and lead root-cause analysis for cycle performance anomalies.
Candidates must hold a bachelor's degree in Mechanical, Aerospace, Chemical, or Systems Engineering with at least 5 years of relevant experience. Proficiency in thermodynamic modeling tools like MATLAB, Simulink, or Python is required, along with strong first-principles analytical skills.
Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.
Radiant is seeking a Senior Thermofluids Systems Engineer, Power Conversion to own system-level thermodynamic modeling of our power conversion architecture. This architecture converts heat from nuclear fission into electricity for the customer. You will define operating points that balance system performance and constraints, deliver clear boundary conditions for the teams building fluid systems and turbomachinery, and serve as the primary technical bridge into control systems engineering & reactor modeling teams. This role is critical to delivering the first new commercial reactor design in over 50 years.
Own system-level thermodynamic performance modeling of the power conversion architecture, including design and off-design operating points across startup, shutdown, transients, and off-nominal conditions.
Develop and maintain interface requirements and boundary conditions (pressures, temperatures, flow rates, control signals) for fluid system components, pressure equipment, turbomachinery, and power electronics.
Work with engineers owning hardware and subsystems to develop architectural changes accommodating nominal and off-nominal operation, driving trades across performance, cost, weight, schedule, and safety.
Serve as the primary interface to control systems engineering, providing plant-level dynamic behavior models, operating envelopes, and control-relevant boundary conditions for reactor control scheme development.
Build and maintain performance models (e.g., MATLAB, Python, Simulink) characterizing fluid system behavior across all operating states.
Lead root-cause analysis for cycle performance anomalies, correlating test data with system models to inform engineers owning hardware components.
Perform or review trade studies to optimize cycle and fluid system architecture against program requirements.
Own system-level risk analysis (FMEA) for fluid subsystems and cycle performance.
Communicate clearly with both technical and non-technical audiences across multidisciplinary teams.
Bachelor's degree in Mechanical, Aerospace, Chemical, or Systems Engineering from an accredited institution.
5+ years of experience in thermodynamic/power cycle modeling, systems engineering, or performance engineering, including requirements development and system-level verification.
Strong working knowledge of thermodynamics and fluid dynamics as applied to power generation cycle design.
Proficiency in system modeling tools such as MATLAB, Simulink, or Python for performance and simulation analysis.
Strong first-principles analytical skills, with the ability to manage competing priorities and communicate program status clearly.
Experience with fluid system architecture, including piping, compressors, valves, and heat exchangers.
Experience supporting control scheme development for thermal or power generation plants.
Familiarity with process piping and pressure vessel codes such as ASME B31.3, BPVC Section VIII, and BPVC Section III.
Experience with turbomachinery performance modeling or heat rejection system design (e.g., cooling towers, air-cooled condensers).
Experience supporting hardware build, assembly, and test in a production or development environment.
Prior experience with FMEA and formal risk management processes.
Nuclear industry experience is a plus but not required.
Must be willing to work extended hours and weekends as necessary to accomplish our mission.
Must work 100% on-site at El Segundo HQ.
Stock: Substantial incentive stock plan for all full-time employees.
Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
One Medical: Sponsored memberships for employees and their dependents.
Vision: 100% top tier plan coverage + 50% for dependents.
Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.
The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: [email protected].
We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.
This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.
Making Nuclear Power Portable.
Radiant is building the world’s first mass-produced portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1 MW failsafe microreactor that can be transported anywhere power is needed. Founded in 2020, Radiant plans to test its first reactor in 2026, with initial customer deployments beginning in 2028.
Offices: 1921 E Maple Ave, El Segundo, California 90245, US
Based on 586 listings with disclosed salaries, most manufacturing jobs in El Segundo, CA pay between $91k–$213k per year. Individual offers vary with seniority, company size, and specialization.
There are currently 645 open manufacturing positions in El Segundo, CA listed on Clera. New openings are added daily as companies post roles.
Companies currently hiring include Boeing, Varda Space Industries, Radiant, CHAOS Industries, RTX, among others. Browse the listings above to see every active employer.
Yes — 39 of the 645 open manufacturing positions offer remote or hybrid work (5 remote, 34 hybrid).
Each listing links directly to the employer's application page. Apply early — fresh listings get the most recruiter attention in the first two weeks.
