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Radiant is building the world's first mass-produced, portable nuclear microreactors. The company's flagship product, Kaleidos, is a 1-megawatt, fail-safe microreactor designed for rapid deployment to hospitals, data centers, remote sites, and military bases, capable of running for up to 5 years without refueling. Founded in 2020, Radiant is preparing for initial customer deliveries in 2028.
As Senior Structures Engineer, you will own the design and development of critical concrete and precast structural systems supporting Radiant's manufacturing and deployment infrastructure. This is a high-impact role solving unique engineering challenges in extreme thermal and seismic environments.
Key responsibilities include:
- Full ownership of concrete structures such as spent fuel dry cask storage systems, factory foundations, and precast elements supporting manufacturing and site operations
- Conducting trade studies and developing designs for static, thermal, and seismic loading conditions
- Performing detailed structural analysis using hand calculations and finite element tools (Abaqus, Ansys, SAP2000)
- Developing and executing construction, fabrication, and test plans for precast and cast-in-place concrete
- Creating and managing Bills-of-Materials (BOM)
- Finding and developing suppliers and fabricators for precast concrete components
- Owning subassembly design, fabrication, and test schedules
- Conducting risk analysis (FMEA) for concrete structural subsystems
- Collaborating with cross-functional teams (mechanical, civil, geotechnical engineers)
Required qualifications: Bachelor's degree in Civil, Structural, or Mechanical Engineering; 5+ years designing concrete or reinforced concrete structures; 4+ years performing structural analysis using both hand calculations and FEA tools.
Desired qualifications include active PE license, experience with ACI 318 reinforced concrete design codes, precast concrete systems design, dry cask storage or spent nuclear fuel storage systems, seismic design/qualification, nuclear facility structural design, GD&T and construction tolerancing, and experience with text-based software development tools.
The role requires 100% onsite work at El Segundo headquarters with willingness to work extended hours and weekends as needed. Radiant offers substantial equity grants, comprehensive health benefits (medical, vision, dental), 8 weeks paid parental leave, daily catered lunch, flexible PTO, and a collaborative team environment near the Pacific Ocean.
