El Segundo, California, United States · On-site
$173k–$237k/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: Nuclear engineering, Reactor design, Physics, Engineering physics, Team management
El Segundo, California, United States · On-site
$135k–$169k/yr
Title: Systems Integration and Test Engineer Belong. Connect. Grow. with KBR! KBR’s National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence an…
Skills: Systems engineering, Integration and test, SATCOM, Spacecraft hardware, Payload hardware
El Segundo, California, United States · On-site
$140k–$170k/yr
About Varda Low Earth orbit is open for business. Varda is accelerating the development of commercial space infrastructure, from in-orbit pharmaceutical processing to reliable and economical reentry capsules. Varda’s W-S…
Skills: Human Resources, HRBP, People Operations, Organizational design, Workforce planning
El Segundo, California, United States · On-site
$93k–$126k/yr
About Varda Low Earth orbit is open for business. Varda is accelerating the development of commercial space infrastructure, from in-orbit pharmaceutical processing to reliable and economical reentry capsules. Varda’s W-S…
Skills: Calendar management, Travel arrangements, Meeting coordination, Expense reporting, Office administration
El Segundo, California, United States · On-site
SAIC is seeking an experienced Space Systems Engineer to lead a complex systems acquisition within the Space Combat Power systems portfolio. This role requires extensive expertise in government weapon systems engineering…
Skills: Systems Engineering, Strategic Planning, Program Integration, Risk Mitigation, Technical Oversight
El Segundo, California, United States · Hybrid
$95k–$143k/yr
The Aerospace Corporation is the trusted partner to the nation’s space programs, solving the hardest problems and providing unmatched technical expertise. As the operator of a federally funded research and development ce…
Skills: Python, Machine learning, Data science, Artificial intelligence, Deep learning
El Segundo, California, United States · Hybrid
$148k–$200k/yr
Title: Cyber & Cross Domain Solution (CDS) Systems Engineer Belong. Connect. Grow. with KBR! KBR is seeking an experienced Cyber & Cross Domain Solution (CDS) Systems Engineer to support the MSEIT contract at Space Syste…
Skills: Cybersecurity, Cross Domain Solutions, Systems Engineering, DevSecOps, CI/CD
El Segundo, California, United States · Hybrid
$99k–$225k/yr
Space Payload RF Engineer, Lead The Opportunity: Are you ready to lead the design, development, integration, and test of mission‑critical RF payloads that will define the next generation of space vehicles? As an RF engin…
Skills: RF circuit design, Microwave circuit design, Antenna design, Link analysis, Space payload integration
El Segundo, California, United States · Hybrid
$100k–$176k/yr
The Aerospace Corporation is the trusted partner to the nation’s space programs, solving the hardest problems and providing unmatched technical expertise. As the operator of a federally funded research and development ce…
Skills: Structural engineering, Finite element analysis, Solid mechanics, Structural mechanics, Pressure vessels
El Segundo, California, United States · Hybrid
$95k–$147k/yr
Title: Test & Validation Engineer Belong. Connect. Grow. with KBR! KBR is seeking a Test & Validation Engineer to support the MSEIT contract at Space Systems Command (SSC). This role supports the program's testing and va…
Skills: Software testing, Validation, Integration testing, User acceptance testing, Defect management
El Segundo, California, United States · On-site
$118k–$225k/yr
Date Posted: 2026-08-28 Country: United States of America Location: US-CA-EL SEGUNDO-E01 ~ 2000 E El Segundo Blvd ~ BLDG E01 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: The a…
Skills: Manufacturing operations, Program management, New product introduction, Transition to production, Proposal development
El Segundo, California, United States · On-site
$146k–$277k/yr
Date Posted: 2026-08-28 Country: United States of America Location: US-CA-EL SEGUNDO-E01 ~ 2000 E El Segundo Blvd ~ BLDG E01 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: Activ…
Skills: Program management, Cost management, Schedule management, Technical performance, Earned value management systems
El Segundo, California, United States · On-site
$118k–$225k/yr
Date Posted: 2026-08-28 Country: United States of America Location: US-CA-EL SEGUNDO-E01 ~ 2000 E El Segundo Blvd ~ BLDG E01 Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: U.S. …
Skills: Configuration management, Component engineering, Product lifecycle management, Engineering change control, Technical data management
El Segundo, California, United States · On-site
$107k–$147k/yr
Title: Enterprise Test & Evaluation Engineer Belong. Connect. Grow. with KBR! KBR’s National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence an…
Skills: Test and evaluation, Systems engineering, SATCOM, Requirement verification, Test methodology
El Segundo, California, United States · On-site
$91k–$164k/yr
Manufacturing Engineer - Structures & Propulsion - 2nd Shift - Millennium Space Systems Company: Millennium Space Systems Millennium Space Systems, a part of Boeing Defense, Space and Security (BDS), is a fast, agile sma…
Skills: Manufacturing engineering, Mechanical design, Aerospace engineering, CAD software, GD&T
El Segundo, California, United States · On-site
$117k–$176k/yr
The Aerospace Corporation is the trusted partner to the nation’s space programs, solving the hardest problems and providing unmatched technical expertise. As the operator of a federally funded research and development ce…
Skills: C++, Software architecture, Modeling and simulation, Systems engineering, Technical leadership
El Segundo, California, United States · On-site
$116k–$159k/yr
Title: Senior Data Visualization Engineer Belong. Connect. Grow. with KBR! KBR is seeking highly motivated Senior Data Visualization Engineer to design and develop advanced data visualization solutions supporting satelli…
Skills: Data visualization, Software engineering, SATCOM, Power BI, Tableau
Scottsdale, Arizona, United States · On-site
Title: Space Systems Engineer KBR’s National Security Solutions team provides high-end engineering and advanced technology solutions to our customers in the intelligence and national security communities. In this positio…
Skills: Space systems engineering, Orbital mechanics, Navigation, Sensor employment, Communications
El Segundo, California, United States · On-site
$85k–$127k/yr
The Aerospace Corporation is the trusted partner to the nation’s space programs, solving the hardest problems and providing unmatched technical expertise. As the operator of a federally funded research and development ce…
Skills: Agile Coaching, Scrum Framework, Kanban, Conflict Resolution, Product Backlog Refinement
El Segundo, California, United States · On-site
$111k–$199k/yr
Manufacturing Engineer - Structures & Propulsion - 1st Shift - Millennium Space Systems Company: Millennium Space Systems Millennium Space Systems, a part of Boeing Defense, Space and Security (BDS), is a fast, agile sma…
Skills: Manufacturing engineering, Mechanical engineering, Root cause analysis, Engineering drawings, Technical problem-solving
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The Director of Nuclear Engineering will lead and grow a team focused on core physics, shielding, and nuclear instrumentation while managing design and analysis strategies. They are responsible for identifying technical risks, standardizing analysis roadmaps, and ensuring efficient delivery across multiple reactor programs.
Candidates must hold a degree in nuclear engineering or physics and possess at least 10 years of experience in reactor design and analysis. Proficiency in Monte Carlo neutron transport codes and familiarity with DOE or NRC regulatory processes are required.
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 highly motivated Director, Nuclear Engineering to organize nuclear design and analysis strategy spanning the design, operation, and iteration of our microreactor fleet.
Lead and grow a team of nuclear engineers spanning core physics, shielding performance, dose and consequence analysis, and nuclear instrumentation domains
Manage team execution to efficiently deliver against the strategy, remove roadblocks, and adapt to shifting priorities
Identify, manage, and effectively communicate technical, schedule, and regulatory risks
Develop and standardize analysis roadmaps to enable fast iteration across multiple reactor programs
Foster an attitude of ownership and mentorship within the team
Define the approach to nuclear engineering design margins and methodical peer reviews
Interact with universities, national labs, and other outside entities as necessary to accomplish key objectives
Hold a degree in nuclear engineering, physics, or engineering physics from an accredited institution
Minimum 10 years of experience managing a team in reactor design and analysis
Fluency in engineering first principles across nuclear, thermal, electrical, and mechanical domains
Excellence in communicating nuclear engineering concepts to a multidisciplinary audience
Familiarity with DOE authorization and/or NRC requirements and processes, and demonstrated experience with the development of nuclear facility safety bases
Must be willing to relocate to Radiant’s El Segundo office
Experience with Monte Carlo neutron transport codes, including OpenMC, Serpent, or MCNP
Hands-on experience designing products, hardware, or tests
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite 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 1288 listings with disclosed salaries, most engineering jobs in El Segundo, CA pay between $94k–$220k per year. Individual offers vary with seniority, company size, and specialization.
There are currently 1,430 open engineering positions in El Segundo, CA listed on Clera. New openings are added daily as companies post roles.
Companies currently hiring include Boeing, The Aerospace Corporation, RTX, Varda Space Industries, CHAOS Industries, among others. Browse the listings above to see every active employer.
Yes — 155 of the 1430 open engineering positions offer remote or hybrid work (14 remote, 141 hybrid).
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