Senior Test Engineer, Mechanical/Fluids

The role

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

What you will do

• Own and lead the test strategy across development, qualification, and production acceptance phases
• Define test objectives, plans, success criteria, instrumentation strategies, and data requirements
• Serve as the technical authority for test methods, measurement quality, and data integrity
• Translate analytical predictions and design requirements into targeted test campaigns
• Serve as Test Conductor/Test Director
• Plan and execute fluid, mechanical, and thermal tests on Kaleidos hardware
• Partner with design engineers to develop test methods and fixtures
• Integrate hardware into test setups including plumbing, instrumentation, data acquisition, and controls
• Author and maintain test procedures meeting DOE/NRC-aligned documentation standards
• Analyze test data and support root cause investigations

Required qualifications

• 5+ 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

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 overseeing proof and leak testing, guiding technicians, and activating test skids/stands
• Experience with high pressure gases, pressure safety and stored energy
• 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 thermal, material, and mechanical test fixtures
• Experience with DAQ, PLCs, and analysis tools (e.g., Beckhoff, Python, MATLAB)
• Familiarity with ASME B31.3, B31.1, and BPVC Sections III/VIII

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 made 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.