Mechanical Engineer

Radiant is seeking a highly motivated Mechanical Engineer to join the team responsible for the design, development, and integration of critical mechanical systems for our Kaleidos product. This role involves hands-on mechanical design and analysis of complex hardware operating in demanding environments. The ideal candidate has strong first-principles understanding of structures, materials, fluids, and thermodynamics, and enjoys taking designs from concept through testing and production. Hands-on engineering experience through internships, co-op programs, research projects, or team-based design competitions (e.g., SAE, ASME, Formula SAE) is a strong advantage.

Responsibilities and Duties

• Design, build, and test mechanical components and systems supporting Radiant’s power generation and cooling platforms.

• Develop detailed mechanical designs for components and assemblies, including structural parts, housings, rotating or moving elements, and interfaces.

• Perform static and dynamic structural analyses using hand calculations and FEA tools (ANSYS, Abaqus, or equivalent) to evaluate stresses, deformations, and fatigue life.

• Prepare technical reports, design documentation, and presentation materials to support design reviews and decision-making.

• Support the build, assembly, and testing of prototype, first-article, and production hardware.

Required Qualifications and Skills

• Bachelor’s or Master’s degree in Mechanical Engineering or a related field.

• 2+ years of experience in mechanical design and analysis of hardware, components, or mechanical systems.

• Proficiency in CAD and FEA tools (SolidWorks, ANSYS, Abaqus, or equivalent), including working knowledge of GD&T.

• Strong problem-solving skills and the ability to clearly communicate technical concepts.

Desired Qualifications and Skills

• Experience supporting power, energy, or industrial systems.

• Knowledge of material selection for high-temperature, high-load, or demanding operating environments.

• Hands-on experience with mechanical testing, instrumentation, or experimental validation.

• Exposure to one or more mechanical engineering focus areas such as structures, mechanisms, heat transfer, or dynamics.

• Familiarity with relevant industry standards (ASME, ISO, API, or similar).

• Prior nuclear experience is not required for this role.

Additional Requirements

• Willingness to work extended hours and weekends as necessary to accomplish our mission.

• Ability to work 100% onsite at Radiant’s El Segundo headquarters.

Benefits and Perks

• 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: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage + 50% for dependents.

• Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.

• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.

• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

• Daily catered lunch. Free snacks and drinks.

• Flexible PTO policy. Remote workday allocation.

• Company and team-bonding events, happy hours and in-person camaraderie.

• Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. 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.

The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team. If that’s you, contact us directly for immediate opportunities: recruiting@radiantnuclear.com.

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.

Unfortunately, we are unable to provide visa sponsorship at this time.

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.

Compensation Range: $106,500 - $146,475