Principal Turbomachinery Engineer

The role

The Principal Turbomachinery Engineer serves as the Responsible Engineer for the turbomachinery within a nuclear-driven power generation system. This role owns the mechanical design, integrity, and performance of the core rotating assembly for a 1MW closed-loop Brayton cycle.

What you will do

• 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.
• Make technical decisions on rotor layout, shafting, bearings, seals, materials, and clearances.
• Ensure designs meet performance, reliability, safety, and regulatory requirements.
• Lead detailed design of rotors, shafts, housings, and support structures.
• Test and validate turbomachinery through model correlation and performance verification.
• Perform and review structural and thermal analysis.
• Partner with electrical, thermal, manufacturing, and test teams.

Required qualifications

• B.S. in Mechanical Engineering or related field.
• 10+ 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 analysis tools (e.g., ANSYS).
• Advanced use of NX and Teamcenter.
• Strong understanding of tolerancing, GD&T, and precision mechanical assembly.
• Experience owning hardware through design, build, and test cycles.
• Hands-on experience with assembly, integration, and troubleshooting of turbomachinery.
• Strong system-level thinking and mechanical intuition.
• Excellent engineering judgment and decision-making capability.
• Ability to influence without authority across cross-functional teams.

Nice to have

• Experience with closed-loop Brayton cycle systems or similar energy systems.
• Familiarity with high-temperature materials and extreme environment design.
• Experience integrating mechanical systems with high-speed electric machines.
• Prior experience as a Responsible Engineer for complex hardware.
• Experience scaling hardware from prototype to production.

Benefits

• Substantial incentive stock plan for all full-time employees.
• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
• One Medical: Sponsored memberships for employees and their dependents.
• Vision: 100% top tier plan coverage + 50% for dependents.
• Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.
• Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
• 8-weeks of paid parental leave for all parents.
• Additional paid pregnancy leave for CA employees.
• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University.
• Daily catered lunch.
• Free snacks and drinks.
• Flexible PTO policy.

Before you apply

• Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.

About the company

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force.