Senior Power Electronics Engineer

About Radiant 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, fail‑safe microreactor that can be transported anywhere power is needed and run for up to 5 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. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory‑built microreactors that use existing, well‑qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory this summer, with initial customer deliveries beginning in 2028. Location: El Segundo, CA Employment Type: Full time Location Type: On‑site Department: Engineering / Electrical Engineering Compensation Annual Salary Range: $158,000 – $219,450 Equity offered Role Overview The Senior Power Electronics Engineer will lead the design and development of power electronics for our nuclear‑driven high‑speed generator. Responsibilities include designing high‑voltage and high‑speed generator drives, DC‑DC converters for high‑voltage batteries, and standalone and grid‑tied inverters. You will own power electronics design, analysis, simulation, and component selection, and collaborate with cross‑functional teams, vendors, and government partners to bring the first nuclear microreactor to market. Responsibilities & Duties Design power electronic systems to convert AC and DC power sources into stable grid‑compatible voltages and frequencies. Configure and own system active rectifiers, inverters, and DC‑DC converters. Apply EMI/EMC strategies, including line filter, capacitor, grounding, and isolation selection. Design and validate gate drivers, power stages, magnetics, and controls. Model and simulate inverters in detail. Build a fully functioning inverter autonomously. Perform formal circuit analysis, including derating and worst‑case scenarios. Optimize loss, efficiency, and conduct thermal analysis of the inverter. Required Qualifications & Skills Bachelor’s degree in Electrical Engineering, specializing in power electronics. 6+ years of experience designing high‑voltage and high‑power electronics. Expertise in high‑voltage power semiconductor selection (Si/SiC/GaN, IGBT, diodes, MOSFETs), gate driver, and protection circuit design. Strong experience in high‑voltage (≥800V) power electronics design, including AC‑DC inverters and DC‑DC converters. Deep understanding of PWM switching techniques (DPWM, ZCS, ZVS). Proficiency with at least one common power electronics tool (PLECS, PSCAD, dSPICE, PSIM, or Simplorer). Expertise in EMI/EMC filter design for stability, noise rejection, and threat signal survival. Solid understanding of capacitor and super‑capacitor design and selection (electrolytic, film, ceramic, tantalum). Desired Qualifications & Skills 8+ years of design experience in high‑voltage and high‑power electronics. Experience with magnetics design, including transformers and inductors for high‑frequency power conversion. Familiarity with functional safety standards (IEC61508 or equivalent) and fault‑tolerant design practices; background in aerospace, defense, or nuclear applications a plus. Startup experience or ability to thrive in a fast‑paced development environment. Demonstrated experience in embedded programming with C/C++. Additional Requirements Willingness to work extended hours and weekends as necessary. Must work 100% onsite at El Segundo HQ. Benefits & Perks Substantial incentive stock plan for all full‑time employees. Medical: 100% up to base silver level plan for employee; 50% for dependents, with options up to Platinum. One Medical sponsored memberships for employees and dependents. Vision and dental: 100% top‑tier coverage for employees, 50% for dependents. Voluntary life, accident, hospital, critical illness, commuter, and FSA/HSA as employee‑contributed benefits. 8‑weeks paid parental leave for all parents; additional paid pregnancy leave for CA employees. Daily catered lunch, free snacks and drinks. Flexible PTO policy and remote workday allocation. Company and team‑bonding events, happy hours, and in‑person camaraderie. Beautiful El Segundo headquarters close to the Pacific Ocean. EEO Statement 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 or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law. 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. #J-18808-Ljbffr