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Radiant is building the world's first mass-produced, portable nuclear microreactors. The Kaleidos 1-megawatt microreactor is designed to be transported anywhere and run for up to 5 years without refueling, targeting hospitals, data centers, remote sites, and military bases as customers. The company was founded in 2020 and plans to test its first reactor at Idaho National Laboratory in summer 2026, with initial customer deliveries beginning in 2028.
You will lead Radiant's nuclear materials team in developing, testing, and qualifying materials and manufacturing processes for the Kaleidos reactor. This is a hands-on leadership role where you will set technical direction, grow the team, and own end-to-end delivery across fuel, moderators, shielding, neutron poisons, and irradiation testing.
Key responsibilities include:
- Setting technical direction for the nuclear materials team, defining project scopes, and developing a roadmap for future reactor designs
- Delivering materials solutions for fuel, moderator, shielding, and neutron poison designs
- Leading and mentoring team members technically and professionally
- Managing the nuclear materials engineering team's technical output and accountability
- Communicating project status, issues, and schedules to teammates and executives
- Presenting to external stakeholders including DOE and NRC
- Reviewing test plans, purchase orders, and analysis
- Managing irradiation testing from experiment design through post-irradiation examination (PIE)
- Providing surge materials engineering support as needed
Radiant offers substantial equity grants, comprehensive health benefits (medical, dental, vision), 8 weeks paid parental leave, daily catered lunch, flexible PTO, and a collaborative team environment near the Pacific Ocean in El Segundo.
REQUIREMENTS:
- Bachelor's degree in Materials Science and Engineering, or in Mechanical, Aeronautical, Nuclear, or Chemical Engineering with materials science focus
- 5+ years of experience in development, testing, and/or analysis of nuclear materials for demanding load cases and environments
- Hands-on experimental or testing experience in laboratory or production environments
- Must be willing to work extended hours and weekends as necessary
- Must work 100% onsite at El Segundo HQ
- Position involves access to technology subject to U.S. export controls; offer contingent on compliance capacity
DESIRED QUALIFICATIONS:
- Master's or PhD in Materials Science and Engineering or related field
- 2+ years of engineering leadership and management experience at companies building/testing hardware for nuclear, aerospace, or extreme environments
- Expert-level competency in fuel, neutron poisons, shielding, or moderators
- Experience with material systems development and qualification for high-temperature and irradiation environments
- Knowledge of standard materials test methods and design allowables development
- 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)
