Senior Test Engineer

About the Company

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 designed to provide critical power to hospitals, data centers, and remote sites.

Responsibilities

• Perform testing as a Test Conductor/Test Director to ensure procedures align with real-world execution
• Partner with design engineers to develop innovative test methods for complex mechanisms and structures
• Support testing and iterative improvements of fluid, electrical, and structural hardware
• Identify and develop appropriate suppliers for component sourcing and fabrication
• Drive initiatives for continuous improvement in test processes and data delivery quality
• Ensure compliance with DOE and NRC standards in procedural documentation

Requirements

• 5+ years of professional engineering experience in system design, analysis, or testing
• Bachelor’s degree in mechanical, manufacturing, or a related engineering discipline
• Background in highly regulated industries such as nuclear, aerospace, aviation, or maritime
• Strong technical fundamentals in fluids and thermodynamics
• Ability to work 100% onsite in El Segundo, CA

Preferred Qualifications

• Prior experience as an operator in fast-paced test environments (e.g., rocket engines, turbopumps)
• Experience designing, fabricating, or operating fluid systems
• Knowledge of instrumentation including pressure transducers, thermocouples, and accelerometers
• Ability to interpret engineering standards like ASME 31.3, 31.1, and ASME Boiler Code
• Proficiency with Ion, Epsilon3, NX CAD, Teamcenter, or Beckhoff PLC Controllers

Benefits

• Substantial incentive stock plan
• Comprehensive medical, vision, and dental coverage
• 8 weeks of paid parental leave
• Daily catered lunch and free snacks
• Flexible PTO policy