Senior Power Electronics Engineer

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Radiant is an El Segundo, California‑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 refueling. 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.

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 designing and developing the power electronics of our nuclear‑driven high‑speed generator. You will design high‑voltage, high‑speed generator drives, DC‑DC converters for high‑voltage batteries, and standalone and grid‑tied inverters. Your responsibilities include owning power electronics design, analysis, simulation, and component selection, while partnering cross‑functionally with top industry engineers, vendors, and partner organizations, including government agencies.

• Design and develop power electronics for a nuclear power generator.
• Build detailed schematics, select components, PCB 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 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 (electrolytic, film, ceramic, 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% 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.
• 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.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

Unfortunately, we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicant’s capacity to serve in compliance with U.S. export controls.