Senior Power Electronics Engineer

Radiant; El Segundo (CA); On-site; USD 150,000 - 210,000; Full time

Benefits offered by this job

Stock plan

Medical coverage

One Medical

Vision coverage

Dental coverage

Parental leave

Educational program with Penn State

Daily catered lunch

Flexible PTO

Team events

Job summary

Radiant in El Segundo, CA seeks a Senior Power Electronics Engineer to lead design of power electronics for a nuclear-driven generator. You will own AC/DC inverters, DC/DC converters, and standalone/grid-tied solutions, collaborating across teams and with vendors to bring the first nuclear microreactor to market.

You will evaluate gate drivers, magnetics, and control strategies, perform detailed simulations, and push for efficiency and reliability in a high-stakes environment.

Qualifications

• BS in Electrical Engineering with focus on power electronics.
• 6+ years in high-voltage, high-power electronics design.
• Experience selecting HV semiconductors (SiC/GaN/IGBT/diodes).
• HV design including AC/DC inverters and DC/DC converters.
• Knowledge of PWM switching: DPWM, ZCS, ZVS.
• Familiarity with EMI/EMC filter design.
• Experience with HV components: capacitors, super-capacitors.
• Proficiency with tools such as PLECS/PSCAD/dSPICE/PSIM/Simplorer.
• Embedded C/C++ experience is a plus.

Responsibilities

• Design power electronic systems to convert AC/DC to stable grid voltages.
• Own active rectifiers, inverters, DC/DC converters and related hardware.
• Apply EMI/EMC strategies, filtering, grounding and isolation.
• Design gate drivers, power stages, magnetics and controls.
• Model and simulate inverters; validate with test data.
• Build and demonstrate a functioning inverter end-to-end.
• Perform circuit analysis including de-rating and worst-case checks.
• Analyze losses, optimize efficiency, and assess thermal behavior.

Skills

HV power electronics

Gate driver design

HV semiconductor selection

PWM techniques

EMI/EMC design

Capacitors & super-capacitors

Tool proficiency

Embedded C/C++

Startup experience

Education

Bachelor's degree in Electrical Engineering (Power Electronics)

Tools

PLECS

PSCAD

dSPICE

PSIM

Simplorer

Job description

About Radiant

Radiant is an El Segundo, CA-based company building the world's only mass-produced, transportable nuclear microreactors. The U.S. grid is under growing strain, with power demand accelerating, driving higher utility costs, rising carbon emissions, and interconnection backlogs. Radiant has a solution, transportable, on-site power. Our first reactor, Kaleidos, is 1 megawatt: small enough to be factory-built, transported by land, sea, or air, and deployed wherever power is needed. 1 MW can power 1000 homes for five years. Ship it back and we refuel for a 20 year operating life. We made energy a product that can be used for critical infrastructure like military bases, data centers, hospitals, and remote sites, as well as the commercial main street businesses that keep America running. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Navy and Air Force and has signed pre-order agreements with Equinix, with deployments beginning in 2028.

About the Role

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'll 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.

Responsibilities & Duties:

• Design power electronic systems to convert AC and DC power sources into stable grid compatible voltages and frequencies.

• Take ownership and configure our systems active rectifiers, inverters, dc/dc converters.

• Apply EMI/EMC strategies to the system design, selection of line filters, capacitors, grounding and isolation.

• 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.

Required Qualifications & Skills:

• Bachelor's degree in Electrical Engineering, specializing in power electronics.

• 6+ 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 experience in high voltage (HV) power electronics design (+800V) including AC/DC inverters, and DC/DC converters.

• Strong understanding of different PWM switching techniques, DPWM, ZCS, ZVS.

• Proficiency with at least one of the common power electronics tools such as PLECS, PSCAD, dSPICE, PSIM, or Simplorer.

• Expertise in EMI/EMC filter design for stability, noise rejection, and surviving threat signals.

• Solid understanding of capacitor and super-capacitor design and selection, such as electrolytic, film, ceramic, and tantalum.

Desired Qualifications & Skills:

• 8+ years of design experience designing high voltage and high-power electronics.

• Experience in magnetics design including transformers and inductors for high-frequency power conversion applications.

• Familiarity with functional safety standards (IEC 61508 or equivalent) and fault-tolerant design practices; background in aerospace, defense, or nuclear applications a plus.

• Startup experience or ability to work in a fast-paced development environment.

• Demonstrated experience in embedded programming with C/C++.

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.

Benefits and Perks

• 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.

• Nuclear Engineering Certificate Program: 100% covered educational program with Penn State University, for eligible employees, to rapidly upscale into nuclear.

• 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.

Total Compensation and Benefits

Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s full-time new hire compensation package includes base salary, substantial equity grants, and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance, experience, education, and qualifications, and are designed to support continued growth as scope, responsibility, and impact expand at Radiant.

The best of today’s advanced reactor builders don’t wait for job postings. They join the winning team.

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.