Senior Safety Analysis Engineer (Nuclear)

Location: 100% onsite at hirify.global's headquarters in El Segundo, California, United States

Salary: $150,025–$211,838 per year, plus equity

Company

hirify.global is a startup developing mass-produced, portable nuclear microreactors. Its first reactor, Kaleidos, is a 1-megawatt fail-safe microreactor designed for rapid deployment and operation for up to five years without refueling.

What you will do

• Lead deterministic reactor safety analyses for normal operation, transients, anticipated operational occurrences, and postulated accidents.
• Develop and apply system-level thermal-hydraulic and transient models to evaluate reactor response, operating limits, and safety margins.
• Perform source term, fuel performance, fission product transport, and radiological consequence analyses.
• Evaluate modeling uncertainties, sensitivity studies, bounding assumptions, and phenomena rankings.
• Collaborate with nuclear, mechanical, thermal, materials, controls, testing, and regulatory teams to resolve safety-related technical challenges.
• Prepare and review calculation packages, safety analysis reports, regulatory documentation, and verified and validated analysis methods.

Requirements

• Bachelor's degree in nuclear engineering, mechanical engineering, or a related technical discipline.
• 5+ years of experience in reactor safety analysis, thermal-hydraulics, nuclear systems modeling, or related engineering disciplines.
• Experience with reactor systems or safety analysis codes such as RELAP5-3D, TRACE, SAM, MELCOR, or equivalent tools.
• Strong knowledge of reactor thermal-hydraulics, transient behavior, heat transfer, deterministic safety analysis, reactor physics, fuel performance, and radiological safety.
• Experience evaluating uncertainty, sensitivity, conservatism, source terms, radiological consequences, or safety-related performance calculations.
• Must work 100% onsite at hirify.global's El Segundo headquarters. Strong written and verbal communication skills are required.

Nice to have

• Master's degree or Ph.D. in nuclear engineering, mechanical engineering, or a related discipline.
• Experience with high-temperature gas-cooled reactors, microreactors, advanced reactors, or first-of-a-kind nuclear systems.
• Experience with TRISO fuel, ORIGEN, MACCS, PARFUME, BISON, MCNP, OpenMC, Serpent, or SCALE.
• Familiarity with probabilistic risk assessment, licensing basis events, nuclear quality assurance, DOE authorization, NRC licensing, or nuclear industry standards.

Culture & Benefits

• Substantial incentive stock plan for full-time employees.
• Comprehensive medical, vision, dental, life, accident, hospital, critical illness, commuter, FSA, and HSA benefits.
• Eight weeks of paid parental leave for all parents, with additional paid pregnancy leave for California employees.
• Flexible PTO, a remote workday allocation, daily catered lunch, snacks, drinks, and team events.
• Work from an El Segundo headquarters near the Pacific Ocean.