Principal Electrical Architect — Nuclear Microreactor Hardware

Radiant; El Segundo (CA); On-site; USD 140,000 - 210,000; Full time

Benefits offered by this job

Stock options

Medical coverage

One Medical

Vision coverage

Dental coverage

Flexible PTO

Lunch provided

Parental leave

Education program

Job summary

Radiant in El Segundo, CA seeks a Principal or Staff Electrical Engineer to define and lead the electrical architecture for Kaleidos, our commercial microreactor targeted for customer deployment in 2028. You will own end-to-end PCB development, mixed-signal design, high-speed interfaces, power distribution, and signal integrity for reactor control hardware.

You will mentor the electrical team, drive design reviews, coordinate with firmware, FPGA, and DSP groups, and shape the hardware roadmap as

Qualifications

• Bachelor’s degree in Electrical Engineering or a related field.
• 8+ years designing custom multilayer and mixed-signal PCBs.
• Experience shipping hardware you designed, with ownership across most of the lifecycle.
• Demonstrated experience setting electrical architecture direction and driving decisions across complex, multi-disciplinary programs.
• System-level perspective across design analysis, fabrication, and testing.
• DSP experience applied to data acquisition and real-time signal processing.
• Circuit analysis and simulation experience (PSpice, LTspice).
• Strong schematic capture and PCB layout experience (Altium Designer, Cadence, or similar).
• Strong command of signal integrity, power integrity, and grounding.
• Analog and mixed-signal design experience, including sensor interfaces and ADC/DAC integration.
• Familiarity with high-speed interfaces (SPI, I2C, UART, Ethernet) and their layout constraints.
• Hands-on board bring-up, troubleshooting, and lab instrumentation.
• EMI/EMC mitigation experience.
• Experience designing for high-reliability or harsh environments (nuclear, aerospace, defense, or industrial).

Responsibilities

• Own the multilayer mixed-signal boards that control a fission reactor, terrestrial today with space applications ahead.
• Define the system-level electrical architecture for mixed-signal systems: power distribution, analog front ends, and digital control interfaces.
• Design, analyze, and simulate low-noise analog front ends and integrate them with ADC/DAC, DSP, and digital subsystems.
• Own schematic capture, component selection, and layout, including high-speed and precision routing for sensor interfaces, data acquisition, and communication buses, with focus on signal integrity, power integrity, grounding, and EMI/EMC.
• Bring up, debug, and validate hardware hands-on, and write and execute the qualification plans that prove performance, reliability, and environmental margin.
• Work directly with firmware, FPGA, and DSP engineers at the hardware-software boundary, and with customers and interdisciplinary teams.
• Lead design reviews, mentor the electrical team, and own hardware risk identification and mitigation.

Skills

Multilayer PCB design

Mixed-signal design

Signal integrity

System architecture

Debug/bring-up

High-speed interfaces

Sensor interfaces

Harsh environment design

DSP for real-time processing

Education

Bachelor's degree in Electrical Engineering

Master's degree in Electrical Engineering

Tools

Altium Designer

Cadence

Job description

Radiant in El Segundo, CA seeks a Principal or Staff Electrical Engineer to define and lead the electrical architecture for Kaleidos, our commercial microreactor targeted for customer deployment in 2028. You will own end-to-end PCB development, mixed-signal design, high-speed interfaces, power distribution, and signal integrity for reactor control hardware.

You will mentor the electrical team, drive design reviews, coordinate with firmware, FPGA, and DSP groups, and shape the hardware roadmap as