Mechanical Engineer, Electrical Systems

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys first reactor Kaleidos is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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. Radiants unique practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe factory-built microreactors that leverage existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor next year at the Idaho National Laboratory with initial customer deliveries beginning in 2028.

• Support the mechanical design and ownership of electrical components and subsystems including:
• Mechanical design of electrical assemblies such as control panels enclosures brackets mounts and supports
• Cable and wiring harness routing retention strain relief bend radius compliance and serviceability considerations
• Packaging of sensors actuators connectors and electrical hardware within constrained assemblies
• 3D CAD modeling and 2D drawing creation using Siemens NX including tolerance stack-ups and GD&T basics
• Perform first-order load calculations (static shock vibration) to support structural design decisions
• Conduct thermal analysis and heat-transfer assessments for electrical components enclosures and assemblies
• Support selection of materials fasteners and finishes appropriate for electrical thermal and environmental requirements
• Assist in the design and setup of test fixtures and test stands for acceptance and qualification testing
• Participate in system integration troubleshooting and validation activities alongside electrical and systems engineers
• Collect and interpret technical requirements and provide clear constructive feedback across mechanical electrical software and systems disciplines
• Develop document and execute basic test plans and procedures to verify mechanical and thermal performance
• Perform trade studies and first-order analyses to evaluate design options and constraints
• Generate and maintain design documentation to support Design for Manufacturing (DFM) assembly and serviceability
• Support subassembly design coordinate with manufacturing and assist with build and test schedules

• Bachelors degree in Mechanical Engineering or a closely related field from an accredited institution
• Hands-on experience with mechanical design through coursework labs internships senior design projects or engineering clubs
• Proficiency or coursework experience using Siemens NX or similar 3D CAD tools
• Familiarity with mechanical design of electrical assemblies including enclosures brackets and harness routing principles
• Basic understanding of structural mechanics load paths and first-order stress calculations
• Introductory knowledge of thermal analysis heat transfer and thermal management concepts
• Ability to read and create mechanical drawings including dimensions and tolerances
• Strong communication skills and ability to collaborate in a multidisciplinary engineering environment

• Must be willing to work extended hours and weekends as necessary to accomplish our mission
• Must work 100% onsite at El Segundo HQ

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiants 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 todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

Benefits and Perks for Eligible Employees:

• Stock: Substantial incentive stock plan for all full-time employees.
• Medical: 100% premium coverage for base Silver level plan for employee 50% premium coverage for dependents. Platinum plans available.
• One Medical: Sponsored memberships for eligible employees and their dependents.
• Vision: 100% premium coverage for top tier plan 50% for dependents.
• Dental: 100% premium coverage for top tier plan (including orthodontia) 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.

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.

Unfortunately we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicants capacity to serve in compliance with U.S. export controls.