Principal Mechanical Design Engineer, Turbomachinery

El Segundo, CAfull time

Remote

senior

$201k–$314k

H1B: no

Radiant Industries Principal Mechanical Design Engineer, Turbomachinery at Radiant Industries responsible for the mechanical design, integrity, and performance of the core rotating assembly in a 1MW closed-loop Brayton cycle. Leads rotor dynamics, structural integrity, and life analysis for high-speed rotating hardware operating at extreme conditions.

Responsibilities

Radiant is seeking a Principal Mechanical Design Engineer, Turbomachinery to serve as the Responsible Engineer for the turbomachinery within our nuclear-driven power generation system. This role owns the mechanical design, integrity, and performance of the core rotating assembly at the heart of our 1MW closed-loop Brayton cycle.
This is a hands-on, high-ownership role focused on technical excellence, sound engineering judgment, and delivering reliable, production-ready turbomachinery.
Technical Ownership & System Architecture
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 and assemblies.
Define and flow down requirements from system-level constraints including thermal, structural, and operational environments.
Make key technical decisions on rotor layout, shafting, bearings, seals, materials, and clearances.
Ensure designs meet performance, reliability, safety, and regulatory requirements.
Establish and uphold standards for mechanical design rigor, analysis quality, and documentation.
Mechanical Design & Analysis
Lead detailed design of turbomachinery components including rotors, shafts, housings, and support structures.

Qualification

Experience with bearingsStrong understanding of tolerancingHands-on experience with assemblyAdditional RequirementsMust work 100% onsite at El Segundo HQ

Required

B.S. in Mechanical Engineering or related field.
10+ years of experience designing high-speed rotating machinery (turbines, compressors, or similar systems).
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) and advanced use of NX and Teamcenter for complex design, simulation, and product lifecycle management.
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.
Clear communicator capable of articulating complex technical concepts.

Preferred

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.
Additional Requirements:
Must be willing to work extended hours and weekends as necessary to accomplish our mission.
Must work 100% onsite at El Segundo HQ.