Test Engineer, Mechanical/Fluids

The role

You will drive test operations for the development, qualification, and acceptance of nuclear microreactor technology. The role focuses on fluid and mechanical systems through test planning, execution, and hardware integration.

What you will do

• Perform testing as a Test Conductor/Test Director
• Partner with design engineers to develop innovative test methods
• 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
• Support one-off test campaigns to drive hardware risk reduction
• Ensure compliance with DOE and NRC standards

Required qualifications

• 2+ years of full-time professional experience in engineering problem-solving, including system design, analysis, or testing
• Bachelor’s degree from an accredited institution in mechanical, manufacturing, or other related engineering discipline
• Ability to apply first principles thinking to solve problems and make decisions in uncertain or ambiguous situations
• Background in highly regulated industries (e.g., nuclear, aerospace, aviation, maritime)
• Demonstrated ability to lead projects and work independently
• Strong technical fundamentals in fluids and thermodynamics
• Strong written and verbal communication skills
• Flexible and adaptable mindset
• Must be willing to work extended hours and weekends as necessary
• Must work 100% onsite at El Segundo HQ

Nice to have

• Prior experience working in a fast-paced test environments (e.g., rocket engine testing, turbopump testing, component level testing)
• Familiarity in safety protocols, and high-reliability operations, high pressure gases, safety engineering (FMECAs, Keep-out Zone)
• Experience in regulated or high-reliability environments (nuclear, aerospace, aviation, maritime)
• Experience with high pressure gases, pressure safety and stored energy
• Experience with thermal, material, and mechanical test fixtures
• Experience designing, fabricating, or operating fluid systems; ability to read P&IDs and drawings
• Knowledge of instrumentation: pressure transducers, flow meters, thermocouples, RTDs, accelerometers
• Experience with DAQ, PLCs, and analysis tools (e.g., Beckhoff, Python, MATLAB)
• Familiarity with ASME B31.3, B31.1, and BPVC Sections III/VIII
• Experience with leak detection methods (helium, pressure decay)

Benefits

• 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
• Daily catered lunch
• Free snacks and drinks
• Flexible PTO policy

Before you apply

• Any job offer will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls

About the company

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force.