Mechanical Engineer, Electrical Integration (Nuclear)

Location: 100% onsite at hirify.global’s headquarters in El Segundo, California, United States. Extended hours and weekends may be required as necessary.

Salary: $124,500–$172,725 annually, plus equity.

Company

hirify.global is a startup founded in 2020 that develops mass-produced, transportable nuclear microreactors, including the 1 MW Kaleidos reactor for critical infrastructure, remote sites, and commercial customers.

What you will do

• Design and own mechanical aspects of electrical assemblies, including control panels, enclosures, brackets, mounts, and supports.
• Route and retain cables and wiring harnesses while addressing strain relief, bend radius, serviceability, and constrained packaging of sensors, actuators, connectors, and electrical hardware.
• Create 3D CAD models and 2D drawings in Siemens NX, including tolerance stack-ups and GD&T basics.
• Perform first-order static, shock, and vibration load calculations, thermal analysis, heat-transfer assessments, and design trade studies.
• Select materials, fasteners, and finishes; maintain documentation for design for manufacturing, assembly, and serviceability.
• Support subassembly design, system integration, troubleshooting, validation, manufacturing coordination, and build and test activities with multidisciplinary engineering teams.

Requirements

• Bachelor’s degree in Mechanical Engineering or a closely related field from an accredited institution.
• At least 3 years of professional hands-on mechanical design experience.
• Experience with Siemens NX or similar 3D CAD tools.
• Experience with the mechanical design of electrical assemblies, including enclosures, brackets, and harness routing principles.
• Basic understanding of structural mechanics, load paths, and first-order stress calculations.
• Knowledge of thermal analysis, heat transfer, and thermal management concepts.
• Ability to read and create mechanical drawings with dimensions and tolerances.
• Strong communication skills and ability to collaborate across mechanical, electrical, software, and systems disciplines.
• Must work 100% onsite at El Segundo HQ and be able to comply with applicable U.S. export controls.

Nice to have

• At least 5 years of professional hands-on mechanical design experience.
• Mechanical design experience in high-reliability or harsh environments such as nuclear, aerospace, defense, or industrial settings, including thermal cycling, shock, vibration, or radiation exposure.
• Experience with FEA or CFD tools for structural and thermal analysis beyond first-order hand calculations.
• Hands-on experience supporting build, integration, and floor testing, including design iteration based on manufacturing feedback.

Culture & Benefits

• Full-time employees receive substantial incentive stock options, comprehensive medical, vision, dental, and other benefits.
• Eight weeks of paid parental leave for all parents, with additional paid pregnancy leave for California employees.
• Eligible employees receive full coverage for a Nuclear Engineering Certificate Program through Penn State University.
• Flexible PTO, catered daily lunch, snacks and drinks, and company and team events.
• Work is primarily onsite, with a remote workday allocation.