Staff Mechanical Engineer (Nuclear Reactor)

Location: Onsite in Torrance, California, United States. Applicants must be legally authorized to work in the United States as a U.S. citizen or lawful permanent resident.

Salary: $175,000–$225,000 USD per year

Company

hirify.global develops scalable, high-temperature nuclear power systems for industry, hydrogen, and next-generation manufacturing. The Numenor team is building a flagship reactor plant from its first unit through a repeatable production line.

What you will do

• Own the mechanical design basis for major reactor-plant systems, including requirements, interfaces, margins, materials, and code selection.
• Set design direction, make technical acceptability decisions, lead design reviews, and drive systems from concept through design freeze.
• Perform and review stress, thermal, fluid, FEA, and CFD analyses while setting analysis approaches for the team.
• Take designs through procurement specifications, vendor selection, factory build, assembly, testing, and commissioning of the first unit.
• Define qualification and verification plans, support integrated testing, and design for manufacturing and production repeatability.
• Collaborate with systems engineering, safety, IC&E, quality, and supply chain; mentor engineers and lead root-cause investigations.

Requirements

• Bachelor’s degree in Mechanical Engineering or a related field.
• 8+ years of mechanical engineering experience with complex hardware such as pressure systems, heat-transfer equipment, mechanisms, or large structures.
• Experience owning a major system technically, setting margins, and making design decisions.
• Experience leading mechanical scope from concept through build, test, and commissioning.
• Strong foundation in stress analysis, thermal design, materials, and pressure-vessel and piping codes.
• Proficiency with CAD tools such as SolidWorks, Creo, NX, or similar, plus engineering drawing standards.
• Legal authorization to work in the United States as a U.S. citizen or lawful permanent resident is required.

Nice to have

• Master’s degree in Mechanical Engineering or a related field.
• Experience with high-temperature, high-pressure systems, pressure vessels, heat exchangers, and piping.
• First-of-a-kind hardware experience in aerospace, power generation, oil and gas, or defense.
• Experience with helium or other gas systems, sealing, leak tightness, rotating equipment, precision mechanisms, actuators, and qualification testing.
• Working knowledge of ASME Section VIII and B31.3 pressure-vessel and piping codes.
• Design-for-manufacture experience and scaling from prototype to series production.
• Nuclear industry experience in commercial, defense, or national-laboratory settings.
• Mechanical PE license.

Culture & Benefits

• High-impact startup environment with substantial ownership, autonomy, and opportunities for rapid growth.
• Competitive base salary, equity ownership, and comprehensive medical benefits.
• Unlimited PTO, free daily onsite lunch and dinner, and a generous PPE stipend.
• Direct collaboration with experienced operators, engineers, and industry leaders.
• Opportunity to build and scale advanced energy technology from the ground up.