Radiant Industries

Mechanical Engineer, Fluid Systems - 2026 New Graduate

El Segundo, CA · Contract

Sponsorship not specifiedDetected 50 days ago

MATLABHRISCommunication

About the role

These systems include the primary loop subsystems and power conversion loop, serving to convert heat from the reactor core into electrical power.

Help own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers.
Perform thermal and fluids analysis to drive design decisions, verify system performance, and ensure structural integrity using first-principle hand calculations and finite element tools.
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.
Radiant is an El Segundo, CA-based startup building the world's first mass-produced, portable nuclear microreactors.
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.
Perform trade studies to optimize system and meet program requirements.

Prior nuclear experience in not required for this role.
Experienced in design for manufacturability and ramping up hardware build in a production environment.

Bachelor's degree from an accredited institution in Mechanical, Materials, Aeronautical, Civil or Structural Engineering.
Experience with fluid system architecture design.
Experience in designing, building, and testing fluids systems.
Proficient knowledge in fluid dynamics and thermodynamics.
Desired Qualifications &
Knowledge of thermodynamic power cycles.
Prior experience with fluid system modeling via Matlab/Python.
Experienced in designing and operating test stands.
Takes extreme ownership of work and a high degree of responsibility.
Excellent communication across multidisciplinary teams.
Stock: Substantial incentive stock plan for all full-time employees.

100% top tier plan coverage + 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.
Flexible PTO policy.

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.
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.
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.

This listing is sourced directly from Radiant Industries's careers page and normalized into a canonical job model.