Senior Power Electronics Engineer

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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.

The Senior Power Electronics Engineer will play a pivotal role in the design and development of the power electronics of our nuclear‑driven high‑speed generator. Responsibilities include but are not limited to the design of high‑voltage and high‑speed generator drives, DC‑DC converters for high‑voltage batteries, and standalone and grid‑tied inverters. You will join the Power Conversion and Electrical Systems team responsible for converting mechanical energy generated from a nuclear reactor to electrical energy to deliver to customers.

You will own power electronics design, analysis, simulation, and component selection. You will partner cross‑functionally with top industry engineers at Radiant, as well as vendors and partner organizations, including government agencies. Your efforts will be instrumental in bringing the first nuclear microreactor to market.

• Design and develop power electronics for a nuclear power generator.
• Build detailed schematics, select components, PCBA layout, prototype, and validate hardware.
• Apply EMI/EMC strategies and underlying physics to engineering problems.
• Utilize expertise in design and validation of gate drivers, power stages, magnetics, and controls.
• Conduct modeling and detailed simulation of inverters.
• Own the design and build a fully functioning inverter autonomously.
• Perform circuit formal analysis, e.g., de‑rating and worst‑case circuit analysis.
• Optimize loss, efficiency, and conduct thermal analysis of the inverter.

• Bachelor’s degree in Electrical Engineering, specializing in power electronics.
• 8+ years of design experience designing high‑voltage and high‑power electronics.

• Expert with high voltage power semiconductor selection (Si/SiC/GaN, IGBT, Diodes, MOSFETs), gate driver, and protection circuit design.
• Strong understanding of different PWM switching techniques, DPWM, ZCS, ZVS.
• Expert with at least one of the common power electronics tools such as PLECS, PSCAD, dSPICE, PSIM, or Simplorer.
• Solid understanding of capacitor and super‑capacitor design and selection, such as electrolytic, film, ceramic, and tantalum.
• Proficiency in EMI/EMC filter design for stability, noise rejection, and surviving threat signals.
• Startup experience or ability to work in a fast‑paced development environment.
• Demonstrated experience in embedded programming with C/C++.

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

Radiant’s new hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of your interview performance, experience, education, and qualifications.

• 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.
• D…