Senior Thermo-Mechanical Design Engineer (Nuclear Energy)

Location: On-site in Torrance, California, United States

Salary: $140,000–$185,000 per year, plus equity

Company

hirify.global is a Series B startup developing mass-producible, inherently safe microreactors for terrestrial, underwater, and space applications.

What you will do

• Serve as the Responsible Engineer for the Reactor Cavity Cooling System (RCCS).
• Perform thermal-fluid, mechanical, and structural analyses for piping, ducts, stacks, supports, filtration equipment, and reactor cavity structures.
• Define system architecture, operating limits, design margins, and control strategies.
• Develop engineering calculations, system specifications, interface definitions, design reports, and technical justifications for licensing and design reviews.
• Design and support component- and system-level testing, including test articles, instrumentation plans, test stands, and validation procedures.
• Coordinate with reactor systems, structures, licensing, manufacturing, procurement, suppliers, and operations through design, testing, and deployment.

Requirements

• Bachelor’s degree in Mechanical, Aerospace, Nuclear Engineering, or a related discipline focused on thermal-fluid sciences and heat transfer.
• 5+ years of professional experience designing, analyzing, or developing thermal-fluid, HVAC, heat-transfer, or cooling systems.
• Experience with thermal, fluid-flow, and structural engineering calculations.
• Ability to work effectively on multidisciplinary engineering teams and communicate technical concepts to varied stakeholders.
• Ability to work long hours and weekends when necessary for critical milestones.
• Applicants must be U.S. citizens or nationals, lawful permanent residents, refugees, asylees, or eligible to obtain required U.S. government authorizations under export regulations.

Nice to have

• Master’s degree or higher in Mechanical, Aerospace, Nuclear Engineering, Thermal Sciences, or a related field.
• Experience with natural circulation, buoyancy-driven, or convective heat-transfer systems and CFD or multiphysics simulation.
• Expertise in HVAC or industrial ventilation, including equipment selection, ducting, filtration, airflow management, and performance testing.
• Proficiency with ANSYS, COMSOL Multiphysics, FEA, or CFD tools.
• Knowledge of materials, thermal stresses, creep, corrosion, environmental degradation, ASME Boiler & Pressure Vessel Code, or ASME B31 piping codes.

Culture & Benefits

• Significant stock option package in addition to salary.
• Work in a new 322,000-square-foot facility supporting collaboration, R&D, and production.
• Values include systems thinking, end-user focus, unconventional problem-solving, in-person collaboration, and operating through ambiguity.
• Opportunities to support customers, users, and stakeholders directly throughout the product lifecycle.