Lead Electrical Motor Design Engineer

Radiant•El Segundo, CA

6h•Onsite

About The Position

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 failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. Portable nuclear power with rapid deploy capability can replace similar-sized diesel generators, and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028. Radiant is seeking a Lead Electrical Motor Design Engineer to own the architecture, technical direction, and execution of high-speed alternators and primary loop motors for our nuclear-driven power generation systems. This role leads the electric machine design function responsible for our 1MW high-speed rotating machinery central to commercializing Earth’s first mass-produced nuclear reactors. You will set the technical vision for motor design while guiding structural, thermal, and system integration efforts. As a player-coach, you will both contribute directly to design work and mentor a team of engineers to deliver safe, reliable, and production-ready generator systems. This is a hands-on technical leadership role with significant cross-functional influence.

Requirements

B.S. in Electrical Engineering or Mechanical Engineering with specialization in electric machines or rotating machinery
5+ years of experience designing high-voltage, high-power electric motors and/or generators
Demonstrated expertise in permanent magnet motor design for +1kV, +1MW applications operating at up to 40,000 rpm
Strong proficiency with electromagnetic analysis tools (Ansys Motor-CAD, Maxwell, or equivalent)
Experience with structural and thermal analysis of high-speed rotating machinery
Deep understanding of motor–inverter interactions and power electronics integration
Experience leading complex electromechanical development efforts
Hands-on experience with assembly, integration, and testing of electric machines
Must be willing to work extended hours and weekends as necessary to accomplish our mission
Must work 100% onsite at El Segundo HQ
This is an exempt salaried role.

Nice To Haves

10+ years of generator design experience
M.S. or Ph.D. in Electrical or Mechanical Engineering
Knowledge of motor control systems including SVM
Experience scaling hardware from prototype to production
Prior experience leading small, high-performance engineering teams
Experience defining engineering standards and technical processes
Strong system-level thinking and architectural judgment
Ability to balance technical depth with execution speed
Clear communicator capable of aligning cross-functional teams
High ownership mindset and mission-driven motivation
“One team” mentality across engineering disciplines

Responsibilities

Technical Ownership & Architecture
Own system-level architecture and technical roadmap for 1MW, 30krpm alternators and primary loop motors
Lead electromagnetic design of permanent magnet machines for closed-loop Brayton cycle power systems
Define and flow down generator requirements from system-level constraints
Establish best practices for modeling, simulation, validation, and documentation
Make key technical decisions on topology selection, magnetics, insulation systems, cooling strategies, and manufacturability
Ensure designs meet performance, reliability, safety, and regulatory requirements
Team Leadership
Lead and mentor a team of motor design engineers
Conduct design reviews and provide guidance on electromagnetic, structural, and thermal analysis
Drive technical prioritization, risk management, and execution planning
Build engineering rigor, documentation standards, and repeatable development processes
Cross-Functional Integration
Partner closely with turbomachinery, power electronics, thermal, packaging, and software teams
Optimize electromechanical interfaces between generator, inverter, and control systems
Collaborate with manufacturing to transition from prototype to scalable production
Own technical engagement with external vendors and suppliers
Prototyping, Testing & Validation
Oversee development and qualification testing of electric machines
Guide bench, dynamic, and system-level testing campaigns
Lead root cause analysis and rapid design iteration cycles
Maintain hands-on involvement in assembly, integration, and troubleshooting as needed

Benefits

Stock: Substantial incentive stock plan for all full-time employees.
Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
One Medical: Sponsored memberships for eligible employees and their dependents.
Vision: 100% premium coverage for top tier plan + 50% for dependents.
Dental: 100% premium coverage for top tier plan (including orthodontia) + 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.
Daily catered lunch. Free snacks and drinks.
Flexible PTO policy. Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.
Burgeoning satellite offices in Oak Ridge, TN and Washington, D.C., near Capitol Hill.