Senior Fluid Systems Engineer

About Radiant

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys 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. Radiants 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

Radiant is seeking a highly motivated Senior Fluid Systems Engineer to own critical Kaleidos fluid systems from preliminary design through build and production. These systems include the primary loop subsystems and power conversion loop serving to convert heat from the reactor core into electrical power. You will be responsible for the following: trade studies component selection thermal hydraulic analysis piping design vendor selection assembly and testing. You will have an instrumental impact of fueling the first new commercial reactor design in over 50 years by 2026.

Responsibilities & Duties:

• Own end-to-end engineering of fluid systems and components including compressors valves and heat exchangers.

• Perform complex thermal and fluids analysis to drive design decisions verify system performance and ensure structural integrity using first-principle hand calculations and finite element tools.

• Perform trade studies to optimize system and meet program requirements.

• Develop and execute manufacturing/assembly instructions and test plans.

• Create and manage a Bill-Of-Materials (BOM).

• Find and develop suppliers for all components.

• Own subassembly design manufacturing and test schedules.

• Own risk analysis (FMEA) for subsystems.

• Collect requirements provide expertise and feedback to engineers in other functional areas via clear constructive communication.

Required Qualifications & Skills:

• Bachelors degree from an accredited institution in Mechanical Materials Aeronautical Civil or Structural Engineering.

• Experience with fluid system architecture design.

• 5 years of experience in designing building and testing fluids systems.

• Proficient knowledge in fluid dynamics and thermodynamics.

• Proficient knowledge of heat exchanger design and analysis methods.

Desired Qualifications & Skills:

• Knowledge of thermodynamic power cycles.

• Prior experience with designing piping system for thermal growth using hand calculations and FEA tools.

• Experience with process piping design and testing codes such as ASME B31.3 and ASME PCC-2.

• Prior experience with fluid system modeling via Matlab/Python.

• Experienced in design for manufacturability and ramping up hardware build in a production environment.

• Experienced in designing and operating test stands.

• Takes extreme ownership of work and a high degree of responsibility.

• Excellent communication across multidisciplinary teams.

• Prior nuclear experience in not required for this role.

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. Radiants 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 todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

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 applicants capacity to serve in compliance with U.S. export controls.

Required Experience:

Senior IC