Staff Mechanical Engineer, Fluid Systems

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.

Radiant is seeking a highly motivated Staff Mechanical 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 :

• Bachelor’s degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering.   

• Experience with fluid system architecture design.  

• 8+ 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 :  

• Professional Engineer (PE) Mechanical license.

• 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.

• 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.

• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.

• 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 full-time 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: [email protected].
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.