Staff Nuclear Engineer

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

Salary: $185,000–$225,000 per year, plus equity

Company

hirify.global is a startup developing mass-produced, portable nuclear microreactors, including the 1-megawatt Kaleidos reactor for hospitals, data centers, remote sites, and military bases.

What you will do

• Provide technical leadership across reactor physics, core performance, neutron and radiation transport, shielding, dose and activation, thermal-hydraulics, safety analysis, instrumentation and controls, and reactor operations.
• Own nuclear engineering projects from requirements definition and design trades through model development, analysis, technical review, testing, and final documentation.
• Develop, review, and improve high-fidelity transport models for reactor design, safety, testing, and regulatory evaluations.
• Translate analytical results into requirements and design decisions affecting the core, shielding, control systems, fluid systems, structures, and surrounding hardware.
• Lead multidisciplinary trades with reactor systems, thermal, mechanical, electrical, test, operations, safety, and regulatory teams.
• Establish verification and validation, peer review, configuration control, uncertainty evaluation, technical documentation, and analytical methods.

Requirements

• Bachelor’s degree in nuclear engineering or a related technical discipline.
• 8+ years of relevant experience in reactor design, analysis, testing, licensing, safety, or operations.
• Deep knowledge of neutron transport theory, Monte Carlo simulation, nuclear data, statistical convergence, criticality, reactivity, depletion, power distribution, shutdown margin, and uncertainty analysis.
• Professional experience developing and applying MCNP, OpenMC, or comparable neutron and radiation transport models.
• Experience translating analysis into reactor design decisions, technical requirements, safety conclusions, or regulatory documentation.
• Ability to work independently, communicate complex technical conclusions, and drive multidisciplinary problems through closure.

Nice to have

• Master’s degree or Ph.D. in nuclear engineering or a related discipline.
• Experience with advanced reactors, microreactors, high-temperature gas-cooled reactors, or first-of-a-kind nuclear systems.
• Experience with SCALE, Serpent, Shift, Griffin, MOOSE-based applications, Python, or coupled multiphysics analyses.
• Familiarity with DOE authorization, NRC licensing, nuclear industry codes and standards, or regulatory safety analysis.
• Experience with reactor testing, commissioning, startup, mentoring, or technical review.

Culture & Benefits

• Full-time employment with substantial incentive stock eligibility.
• Medical, vision, dental, One Medical, FSA/HSA, commuter, life, accident, hospital, and critical illness 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.
• Mission-driven engineering environment with extended hours when needed and in-person collaboration at the El Segundo headquarters.