Radiant · El Segundo, CA
ABOUT RADIANT Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. Rising energy demand is straining the U.S. grid and driving up utility costs, emissions, and interconnection backlogs. Radiant decentralizes energy, producing power close to where it’s used. Its first reactor, Kaleidos, is a factory-built, 1-megawatt, fail-safe microreactor that can be transported by land, sea, or air and runs up to 5 years without refueling. Deployed locally without a decade-long build or permitting fight, Kaleidos provides independent power for critical infrastructure like military bases, data centers, hospitals, and remote sites. Founded in 2020, Radiant is under contract to deliver power to the U.S. Army, Air Force, Navy, and has pre-order agreements with Equinix, with deployments beginning in 2028. ABOUT THE ROLE Radiant is seeking a Principal or Staff Electrical Engineer to define and lead the electrical architecture for Kaleidos, our commercial microreactor targeted for customer deployment in 2028. The work spans full-stack PCB development, mixed-signal design, high-speed interfaces, power distribution, and signal integrity to support the data acquisition, signal conditioning, and real-time processing that reactor control depends on. You will serve as the technical lead for custom hardware, setting design standards, driving architecture decisions, and owning high-reliability, low-noise board development from requirements definition and schematic capture through layout, bring-up, validation, and field deployment. You will shape the hardware roadmap and guide the electrical team's technical direction as we scale toward first commercial deployments in 2028. RESPONSIBILITIES & DUTIES: - Own the boards that control a fission reactor: multilayer mixed-signal designs for reactor control and instrumentation, terrestrial today with space applications ahead. - Define and own the electrical architecture strategy for mixed-si…
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