Senior Process Engineer (Nuclear Reactor)

Location: Torrance, California, United States; onsite

Salary: $140,000–$180,000 USD annually

Company

hirify.global develops scalable, high-temperature nuclear power systems for industry, hydrogen, and next-generation manufacturing. The Numenor team is building the company’s next reactor and its production line.

What you will do

• Own the process architecture and design of helium services, purification, and systems interfacing with the primary helium loop and pressure boundary.
• Perform mass and energy balances, pressure-drop and heat-transfer analyses, equipment sizing, gas-flow analysis, and transient system analysis.
• Develop PFDs, P&IDs, equipment and piping specifications, engineering calculations, and operating procedures.
• Specify and integrate pressure vessels, heat exchangers, adsorption systems, compressors, valves, piping, instrumentation, and gas analyzers.
• Lead technical requirements, vendor selection, manufacturing-document reviews, fabrication oversight, inspections, acceptance testing, installation, startup, commissioning, and troubleshooting.
• Collaborate with mechanical, systems, safety, IC&E, quality, and supply-chain teams; mentor junior engineers and improve process-engineering standards.

Requirements

• Bachelor’s degree in Chemical Engineering, Mechanical Engineering, Nuclear Engineering, or a related field.
• 5+ years designing industrial process systems, gas-handling systems, thermal-fluid systems, or related energy systems.
• Experience taking complex engineered systems from concept through build, test, and commissioning.
• Strong foundation in thermodynamics, fluid mechanics, and process-engineering principles.
• Experience developing PFDs, P&IDs, process calculations, equipment specifications, and operating procedures.
• Familiarity with industrial instrumentation, process controls, and gas-analysis systems.
• Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident.

Nice to have

• Master’s degree in Chemical Engineering, Mechanical Engineering, Nuclear Engineering, or a related field.
• Experience with helium, cryogenic, high-pressure gas, gas-purification, or vacuum systems, including sealing and leak tightness.
• Knowledge of helium coolant chemistry, impurity control, moisture management, graphite compatibility, and gas sampling.
• First-of-a-kind system experience in aerospace, power generation, oil and gas, chemical processing, or defense.
• Working knowledge of ASME Section VIII and B31.3 pressure-vessel and piping codes and industrial gas-handling standards.
• Experience designing for manufacture and scaling systems from prototype to series production.
• Nuclear industry experience, including HTGRs or other advanced reactors, is a plus but not a prerequisite.

Culture & Benefits

• High-impact startup environment with significant ownership, autonomy, and opportunities for career growth.
• Equity ownership and competitive base salary.
• Comprehensive medical benefits and unlimited PTO.
• Free daily lunch and dinner provided onsite, plus a generous PPE stipend.
• Direct collaboration with experienced operators, engineers, and industry leaders while building advanced energy technology from the ground up.