Principal Electrical Engineer, Electronics

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-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.

Required Qualifications & Skills:

• Bachelor’s degree in Electrical Engineering or a related field.

• 8+ years designing custom PCBs, including multilayer and mixed-signal boards.

• Prior experience shipping hardware you designed, carried from requirements through layout, bring-up, and qualification into production or field deployment.

• Demonstrated experience setting electrical architecture direction and driving decisions across complex, multi-disciplinary programs.

• Strong experience with schematic capture and PCB layout tools (Altium, Cadence, or similar).

• Solid command of signal integrity, power integrity, grounding strategies, and EMI/EMC mitigation.

• Analog and mixed-signal design experience, including sensor interfaces, ADC/DAC integration, and low-noise practices.

• Familiarity with high-speed interfaces (SPI, I2C, UART, Ethernet) and their layout constraints.

• Hands-on experience with board bring-up, debugging, and lab instrumentation (oscilloscopes, spectrum analyzers, VNAs).

• Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial).

Desired Qualifications & Skills:

• Master’s degree in Electrical Engineering or a related field.

• Familiarity with radiation effects and radiation-tolerant electronics design.

• Experience with power electronics or power distribution design.

• Exposure to FPGA or embedded systems supporting hardware/software co-design.

• Familiarity with nuclear instrumentation or detector interface electronics.

• Experience with DFM, DFT, and production bring-up.

Additional Requirements:

• Must be willing to work extended hours and weekends as necessary to accomplish our mission.

Benefits and Perks

• Stock: Substantial incentive stock plan for all full-time employees.

• Daily catered lunch. Free snacks and drinks.

• Flexible PTO policy. Remote workday allocation.