Principal Turbomachinery Engineer

About the Company

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt, fail-safe microreactor designed to provide critical power for hospitals, data centers, and remote sites.

Responsibilities

• Serve as Responsible Engineer for the turbomachinery mechanical system
• Own the mechanical architecture and design strategy for high-speed rotating assemblies
• Lead rotor dynamics, structural integrity, and life analysis for rotating components
• Define and flow down requirements from system-level constraints
• Lead detailed design of rotors, shafts, housings, and support structures
• Perform and review structural and thermal analysis
• Partner with electrical engineering on alternator rotor integration
• Support assembly, integration, and test of turbomachinery hardware
• Define validation strategies including spin testing and thermal testing

Requirements

• B.S. in Mechanical Engineering or related field
• 8+ years of experience designing high-speed rotating machinery
• Deep expertise in structural analysis and mechanical design of turbomachinery
• Experience with bearings, seals, and high-speed shafting design
• Expert-level proficiency with ANSYS, NX, and Teamcenter
• Strong understanding of tolerancing, GD&T, and precision mechanical assembly
• Hands-on experience with assembly, integration, and troubleshooting
• Ability to work 100% onsite in El Segundo

Preferred Qualifications

• 10+ years of turbomachinery or rotating equipment experience
• M.S. or Ph.D. in Mechanical Engineering
• Experience with closed-loop Brayton cycle systems
• Familiarity with high-temperature materials and extreme environment design
• Experience scaling hardware from prototype to production

Benefits

• Substantial incentive stock plan
• 100% medical coverage for employees (up to silver level)
• 100% vision and dental coverage for employees
• 8-weeks of paid parental leave
• Daily catered lunch, free snacks, and drinks
• Flexible PTO policy