Mechanical Engineer, Fluids Systems (Nuclear)

TL;DR

Mechanical Engineer, Fluids Systems (Nuclear): Designing and owning critical fluid systems for portable nuclear microreactors with an accent on thermal-hydraulic analysis, component selection, and production. Focus on converting reactor core heat into electrical power through the design of primary loop subsystems and power conversion loops.

Location: Must work 100% onsite at El Segundo HQ. No visa sponsorship available.

Salary: $107.5K – $150K + Equity

Company

hirify.global is a startup building the world’s first mass-produced, portable nuclear microreactors to provide critical power for hospitals, data centers, and military bases.

What you will do

• Own end-to-end engineering of fluid systems and components, including compressors, valves, and heat exchangers.
• Perform complex thermal and fluids analysis using first-principle hand calculations and FEA tools to drive design decisions.
• Conduct trade studies to optimize system performance and ensure alignment with program requirements.
• Develop and execute manufacturing instructions, assembly plans, and test protocols.
• Manage the Bill-Of-Materials (BOM) and develop a reliable supplier network for all components.
• Lead risk analysis (FMEA) for subsystems and provide technical expertise to multidisciplinary teams.

Requirements

• Bachelor’s degree in Mechanical, Materials, Aeronautical, Civil, or Structural Engineering.
• 2+ years of experience in designing, building, and testing fluids systems.
• Proficient knowledge of fluid dynamics, thermodynamics, and heat exchanger design and analysis.
• Must be able to comply with U.S. export controls.
• Unable to provide visa sponsorship.
• Willingness to work extended hours and weekends as necessary.

Nice to have

• Knowledge of thermodynamic power cycles and experience with piping systems for thermal growth.
• Experience with process piping design and testing codes, such as ASME B31.3 and ASME PCC-2.
• Proficiency in fluid system modeling using Matlab or Python.
• Experience in design for manufacturability (DFM) and operating test stands.

Culture & Benefits

• Comprehensive health, vision, and dental insurance with high employer coverage.
• Substantial incentive stock plan for all full-time employees.
• Daily catered lunch, free snacks, and drinks at the El Segundo headquarters.
• Flexible PTO policy and 8 weeks of paid parental leave.
• Strong in-person camaraderie through team-bonding events and happy hours.