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.

About the Role

We’re looking for a Structural Analyst, Turbomachinery to take ownership of the structural, thermal, and mechanical performance of high-speed rotating machinery, including compressors, turbines, and pumps in our power generation and primary cooling systems.   

You’ll work hand-in-hand with mechanical designers, build engineers, and test teams to ensure hardware performs as expected under extreme mechanical and thermal loads. You’ll contribute to trade studies, iterative design, prototype builds, simulations, and testing, making a tangible impact on Radiant’s mission. 

Responsibilities & Duties:

• Perform structural and thermal analyses of turbomachinery components and assemblies (i.e. compressors, turbines, rotors, electric motors, bearings, seals, and housings) to guide design decisions and ensure reliability under operational and transient conditions. 

• Evaluate static and dynamic mechanical performance, thermal stresses, and coupled thermal-structural effects. 

• Conduct fatigue, durability, and rotor-bearing performance analyses for high-speed rotating systems. 

• Support analysis of airflow, heat transfer, and temperature distributions within turbomachinery components as part of thermal and structural evaluation. 

• Troubleshoot and investigate complex interactions between mechanical, thermal, and rotor system behavior. 

• Collaborate with mechanical design, build, and test teams to optimize component designs, assembly processes, and thermal management strategies. 

• Support prototype and first-article testing, including test article integration, instrumentation setup, data collection, and analysis. 

• Document technical results, communicate findings, and provide actionable guidance to cross-functional teams. 

Required Qualifications & Skills: 

• B.S. in Mechanical, Aerospace, or Structural Engineering, or a related STEM field. 

• 3–5 years of relevant experience performing structural, thermal, or turbomachinery analysis. 

• Strong foundation in classical mechanics, stress analysis, and heat transfer principles. 

• Hands-on experience with finite element analysis (ANSYS, Abaqus, or equivalent) for structural and thermal simulations. 

• Familiarity with airflow, temperature distributions, and coupled thermal-structural evaluations within rotating machinery. 

• Strong problem-solving, communication, and documentation skills. 

Desired Qualifications & Skills:

• M.S. in Mechanical, Aerospace, or Structural Engineering. 

• Experience with rotor dynamics, critical speed assessment, and vibration/stability evaluations. 

• Hands-on experience with high-temperature materials, thermal stress, and high-speed bearing design. 

• Prior experience in energy, power generation, or regulated industries (nuclear, aerospace). 

• Knowledge of industry standards (API, ASME, ISO). 

• Prior hands-on experience with assembly, rotor stacking, or prototype hardware is a plus.

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission. 

• Must work 100% onsite at El Segundo HQ.

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.