Senior Reactor 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, including the 1-megawatt Kaleidos reactor for rapid-deploy power applications.

What you will do

• Lead testing and verification of reactor components, core assemblies, reactivity control mechanisms, instrumentation, and related subsystems.
• Own testing from requirements definition and planning through execution, data analysis, documentation, and technical review.
• Develop test plans, procedures, instrumentation requirements, and acceptance criteria for hardware performance and safety verification.
• Collaborate with nuclear, mechanical, thermal, controls, and test engineering teams on test strategies and technical challenges.
• Analyze experimental results against analytical predictions, investigate failures and anomalies, and drive corrective actions.
• Support reactor operations, commissioning, integrated testing, readiness assessments, and configuration control.

Requirements

• Bachelor's degree in nuclear engineering, mechanical engineering, or a related technical discipline.
• 5+ years of experience in reactor engineering, hardware testing, design verification, or complex hardware development.
• Experience developing and executing component or subsystem tests, including instrumentation, data analysis, and performance evaluation.
• Strong fundamentals in mechanical systems, heat transfer, materials, instrumentation, and component performance.
• Experience creating technical procedures, acceptance criteria, engineering analyses, and root-cause investigations.
• Must work 100% onsite at the El Segundo headquarters and be willing to support extended hours when needed.

Nice to have

• Master's degree or Ph.D. in nuclear engineering, mechanical engineering, or a related discipline.
• Experience with advanced reactors, microreactors, high-temperature gas-cooled reactors, core assemblies, or safety-critical hardware.
• Familiarity with reactor physics, thermal-hydraulics, nuclear safety, reactor operations, commissioning, or startup.
• Experience with data acquisition systems and testing under demanding thermal, mechanical, or environmental conditions.
• Proficiency with Python, MATLAB, or similar engineering tools, and familiarity with DOE, NRC, nuclear standards, or quality assurance requirements.

Culture & Benefits

• Full-time employees receive a substantial incentive stock plan.
• Medical, vision, dental, life, accident, hospital, critical illness, commuter, FSA, and HSA benefits are available.
• Eight weeks of paid parental leave for all parents, with additional paid pregnancy leave for California employees.
• Flexible PTO, a remote workday allocation, catered lunch, and complimentary snacks and drinks.
• Company and team events, happy hours, and an in-person collaborative work environment near the Pacific Ocean.