Senior Test Engineer, Mechanical/Fluids (Nuclear Microreactors)

Location: 100% onsite at the El Segundo, California headquarters, United States; extended hours and weekends may be required.

Salary: $133.5K–$184.8K annually, plus equity.

Company

hirify.global develops mass-produced, transportable nuclear microreactors, including the 1 MW Kaleidos reactor for critical infrastructure and commercial applications.

What you will do

• Own test strategy across development, qualification, and production acceptance phases, defining objectives, success criteria, instrumentation, and data requirements.
• Plan and execute fluid, mechanical, and thermal tests from component level through full-system campaigns.
• Serve as Test Conductor and Test Director while translating designs and requirements into executable test procedures.
• Integrate plumbing, instrumentation, data acquisition, controls, fixtures, and hardware into test setups.
• Identify hazards and mitigations for pressurized and high-energy tests, including FMECA and keep-out zones.
• Analyze test data, compare results with analytical predictions, support root-cause investigations, and improve test processes.

Requirements

• 5+ years of full-time professional engineering experience involving system design, analysis, or testing.
• Bachelor’s degree from an accredited institution in mechanical, manufacturing, or a related engineering discipline.
• Background in a highly regulated industry such as nuclear, aerospace, aviation, or maritime.
• Strong technical fundamentals in fluids and thermodynamics.
• Ability to apply first-principles thinking, make decisions under ambiguity, lead projects, and work independently.
• Strong written and verbal communication skills.
• Flexible, adaptable, and self-driven approach with the ability to identify requirements with minimal direction.
• Must be willing to work extended hours and weekends as necessary.

Nice to have

• Experience with fast-paced test environments, high-reliability operations, high-pressure gases, proof and leak testing, and pressure safety.
• Experience designing, fabricating, or operating fluid systems and reading P&IDs and drawings.
• Knowledge of pressure transducers, flow meters, thermocouples, RTDs, accelerometers, thermal/material/mechanical fixtures, DAQ, and PLCs.
• Experience with Beckhoff, Python, MATLAB, Ion, Epsilon3, NX CAD, or Teamcenter.
• Familiarity with ASME B31.3, B31.1, and BPVC Sections III/VIII, plus helium and pressure-decay leak detection.

Culture & Benefits

• Full-time employment with incentive stock plan, comprehensive medical, vision, dental, FSA/HSA, and commuter benefits.
• Eight weeks of paid parental leave for all parents, with additional paid pregnancy leave for California employees.
• Fully covered Nuclear Engineering Certificate Program through Penn State University for eligible employees.
• Flexible PTO, catered lunch, snacks, drinks, and company and team events.
• Onsite work at the El Segundo headquarters, with a limited remote workday allocation.

Hiring process

• Applications may be submitted by contacting recruiting@hirify.globalnuclear.com directly for immediate opportunities.
• Compensation and level are determined through evaluation of interview performance, experience, education, and qualifications.
• Any offer is contingent on the applicant’s capacity to comply with U.S. export controls applicable to the technology.