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

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans
• Equity: Substantial incentive stock plan for all salaried employees
• Flexible PTO policy
• Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits
• Vision: 100% coverage + 50% for dependents
• Dental: 100% coverage, orthodontia extra, 50% for dependent
• Team-bonding company outings, happy hours and in-person camaraderie
• Beautiful El Segundo headquarters close to the Pacific Ocean

• 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

• 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