Mechanical Engineering Graduate

Job Description About Radiant Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. 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. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028.
Contribute to the design, analysis, and testing of our microreactor.
Support system-level testing, troubleshooting, and design iteration to accelerate KDU development.
BS or MS in Mechanical Engineering, Aerospace Engineering, or a related discipline.
Graduating in December 2026 or Spring 2027
Strong foundation in engineering first principles, including but not limited to thermodynamics, fluid mechanics, statics, dynamics, and strength of materials.
Hands-on experience in design and build through projects, research, labs, or internships.
Proficiency with engineering tools (e.g., CAD, analysis software, lab instrumentation).
Stock: Substantial incentive stock plan for all full-time employees.

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
• One Medical: Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
• Flexible PTO policy. Remote workday allocation.
• Radiant’s 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.

If that’s you, contact us directly for immediate opportunities: View email address on us.fitly.work.
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. This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.