Radiant is seeking a Senior Electrical Engineer with a strong focus on 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. You will serve as the technical authority for custom hardware, owning the design and development of high-reliability, low-noise printed circuit boards - from requirements definition and schematic capture through layout, bring-up, validation, and field deployment.