Principal Electrical Engineer (Electronics)

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 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-signal systems: power distribution, analog front ends, and digital control interfaces Design low-noise analog front-end circuits and integrate them with ADC/DAC and digital subsystems Own schematic capture, component selection, and layout, including high-speed and precision routing for sensor interfaces, data acquisition paths, and communication buses, with focus on signal integrity, power integrity, grounding, and EMI/EMC mitigation Bring up, debug, and validate hardware hands-on through board-level testing, instrumentation, and root-cause analysis Write and execute the validation and qualification plans that prove performance, reliability, and environmental margin Work directly with firmware, FPGA, DSP, and responsible engineers at the hardware-software boundary Provide technical leadership and mentorship across the electrical team, lead design reviews, and own hardware risk identification and mitigation Benefits Equity: Substantial incentive stock plan for all salaried employees Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans Flexible PTO policy Vision: 100% coverage + 50% for dependents Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits Dental: 100% coverage, orthodontia extra, 50% for dependent Beautiful El Segundo headquarters close to the Pacific Ocean Team-bonding company outings, happy hours and in-person camaraderie Solid command of signal integrity, power integrity, grounding strategies, and EMI/EMC mitigation Bachelor’s degree in Electrical Engineering or a related field Prior experience shipping hardware you designed, carried from requirements through layout, bring-up, and qualification into production or field deployment Hands-on experience with board bring-up, debugging, and lab instrumentation (oscilloscopes, spectrum analyzers, VNAs) Demonstrated experience setting electrical architecture direction and driving decisions across complex, multi-disciplinary programs Familiarity with high-speed interfaces (SPI, I2C, UART, Ethernet) and their layout constraints Strong experience with schematic capture and PCB layout tools (Altium, Cadence, or similar) 8+ years designing custom PCBs, including multilayer and mixed-signal boards Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial) Analog and mixed-signal design experience, including sensor interfaces, ADC/DAC integration, and low-noise practices Experience with power electronics or power distribution design Familiarity with nuclear instrumentation or detector interface electronics Exposure to FPGA or embedded systems supporting hardware/software co-design Master’s degree in Electrical Engineering or a related field Familiarity with radiation effects and radiation-tolerant electronics design Experience with DFM, DFT, and production bring-up #J-18808-Ljbffr