Principal Electrical Engineer, Electronics

Principal Electrical EngineerRadiant is seeking a Principal Electrical Engineer with deep expertise in PCB design to define and lead the electrical architecture for terrestrial reactor control systems, with a long-term path toward space reactor applications. You will serve as the foremost technical authority for custom hardware across the organization — setting design standards, driving architecture decisions, and owning the end-to-end development of high-reliability, low-noise printed circuit boards from requirements definition and schematic capture through layout, bring-up, validation, and field deployment.This role emphasizes full-stack PCB development, including mixed-signal design, high-speed interfaces, power distribution, and signal integrity, while supporting data acquisition, signal conditioning, estimation, and real-time processing functions critical to reactor control. As a principal-level contributor, you will shape the technical roadmap for Radiant's hardware platform and mentor engineers across the electrical team.Responsibilities & Duties:Own the design and development of multilayer PCBs for reactor control and instrumentation systems (terrestrial, with future space applications).Define and own the electrical architecture strategy for mixed-signal systems, including power distribution, analog front ends, and digital control interfaces.Design low-noise analog front-end circuits and ensure robust integration with ADC/DAC and digital subsystems.Perform schematic capture, component selection, and PCB layout with focus on signal integrity, power integrity, grounding, and EMI/EMC mitigation.Develop and review high-speed, high-precision layouts (e.g., sensor interfaces, data-acquisition paths, communication buses).Bring up, debug, and validate hardware, including board-level testing, instrumentation, and root-cause analysis.Create and execute hardware validation and qualification test plans for performance, reliability, and environmental conditions.Collaborate cross-functionally with firmware, FPGA, DSP, and responsible engineers to ensure seamless hardware/software integration.Provide technical leadership and mentorship to junior and senior electrical engineers; lead design reviews and own hardware risk identification and mitigation.Required Qualifications & Skills:Bachelor's degree in Electrical Engineering or a related field.8+ years of experience designing custom PCBs, including multilayer and mixed-signal boards.Demonstrated experience setting electrical architecture direction and driving decisions across complex, multi-disciplinary programs.Strong experience with schematic capture and PCB layout tools (e.g., Altium, Cadence, or similar).Solid understanding of signal integrity, power integrity, grounding strategies, and EMI/EMC mitigation techniques.Experience with analog and mixed-signal design, including sensor interfaces, ADC/DAC integration, and low-noise design practices.Familiarity with high-speed interfaces (e.g., SPI, I2C, UART, Ethernet) and layout constraints.Hands-on experience with board bring-up, debugging, and lab instrumentation (oscilloscopes, spectrum analyzers, VNAs, etc.).Ability to work across disciplines and support system integration in a complex engineering environment.Desired Qualifications & Skills:Master's degree in Electrical Engineering or a related field.Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial).Familiarity with radiation effects and radiation-tolerant electronics design.Experience with power electronics or power distribution design.Exposure to FPGA or embedded systems to support hardware/software co-design.Familiarity with nuclear instrumentation or detector interface electronics.Experience with design for manufacturability (DFM), design for test (DFT), and production bring-up.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.