Radiant
Lead Nuclear Materials Engineer
$140K–$202K
El Segundo, CA · On-site · Full-time · Posted Oct 12, 2026
- Experience
- 5+ years required; 2+ years of engineering leadership and management experience preferred.
- Education
- Bachelor’s degree required; Master’s or PhD preferred. The posting does not state an equivalent-experience alternative.
- Visa sponsorship
- The position involves access to technology subject to U.S. export controls; any offer is contingent on the applicant’s ability to serve in compliance with those controls.
About the job
Leads the nuclear materials team developing, testing, and qualifying materials and manufacturing processes for Radiant’s Kaleidos nuclear microreactor.
What you'll do
- Set the team’s technical direction, project scopes, and materials roadmap; guide engineering activities and team members.
- Deliver materials solutions for fuel, moderators, shielding, and neutron poisons, and manage irradiation testing through post-irradiation examination.
- Oversee technical output, communicate project status, and present to external stakeholders and regulatory bodies.
What they ask for
- Bachelor’s degree in Materials Science and Engineering, or a specified engineering discipline with a materials science and engineering focus.
- 5+ years developing, testing, and/or analyzing nuclear materials for demanding load cases and environments.
- Hands-on experimental or testing experience in laboratory or production environments.
- Willingness to work extended hours and weekends as needed; must work 100% onsite at El Segundo HQ.
Nice to have
- Master’s or PhD in a specified relevant discipline.
- Engineering leadership, nuclear materials expertise, or experience qualifying materials for high-temperature or irradiation environments; Python or similar experience is also noted.
Pay
$140,500 – $202,475 (base salary; the posting labels this as “Compensation” but does not specify whether it is base salary or total pay).
Tools
Python
Model-written summary · the original posting is authoritative