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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. Founded in 2020 and headquartered in El Segundo, CA, Radiant is preparing to test its first reactor at Idaho National Laboratory with initial customer deliveries planned for 2028.
As a Materials Engineer focused on moderator materials, you will own the full lifecycle of in-core moderator and reflector materials development and qualification for Kaleidos. This is a hands-on, high-impact role in a fast-paced, cross-functional environment where you will directly influence the success of a next-generation nuclear technology.
Key responsibilities include:
- Plan and execute materials testing campaigns to obtain properties that inform design decisions
- Develop and qualify application-specific manufacturing processes (graphitization, hot isostatic pressing, extrusion, etc.)
- Provide expert guidance on materials selection for moderator and reflector components
- Lead R&D efforts for advanced moderator and reflector materials
- Coordinate testing with in-house equipment and external labs/vendors
- Evaluate data quality and accuracy for the company materials database
- Define or improve manufacturing processes to achieve desired material properties
You will work closely with design and operations teams in a collaborative environment with access to modern materials testing and characterization equipment.
REQUIREMENTS:
- Bachelor's degree in Materials Science and Engineering, or Mechanical, Aeronautical, Nuclear, or Chemical Engineering with materials science focus
- 2+ years of experience in development, testing, and/or analysis of materials for demanding load cases and environments
- Hands-on experimental or testing experience in laboratory or production environments
DESIRED QUALIFICATIONS:
- Master's or PhD in Materials Science and Engineering or related engineering discipline with materials focus
- Experience with development and qualification of nuclear moderator and reflector materials for high-temperature and irradiation environments
- Knowledge of standard test methods for materials and experience developing design allowables
- Strong organizational, written, and oral communication skills
- Demonstrated ability to work collaboratively with design and operations teams
- Experience with text-based software development tools (Python or similar)
