About Radiant

Radiant is an El Segundo CA-based startup building the worlds first mass-produced portable nuclear microreactors. The companys first reactor Kaleidos is a 1-megawatt fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals data centers remote sites and military bases. Radiants unique practical approach to nuclear development leverages modern software engineering to rapidly deliver safe factory-built microreactors that use existing well-qualified materials. Founded in 2020 Radiant is on track to test its first reactor at the Idaho National Laboratory this summer with initial customer deliveries beginning in 2028.

About the Role

Radiant 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 Radiants hardware platform and mentor engineers across the electrical team.

Responsibilities and 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 and Skills

• Bachelors 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 and Skills

• Masters 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

Benefits and Perks

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

• Medical: 100% up to base silver level plan for employee 50% dependents offers up to Platinum plans.

• One Medical: Sponsored memberships for employees and their dependents.

• Vision: 100% top tier plan coverage 50% for dependents.

• Dental: 100% top tier plan coverage orthodontia extra 50% for dependents.

• Voluntary life accident hospital critical illness commuter and FSA/HSA are offered as employee contributed benefits.

• 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

• Daily catered lunch. Free snacks and drinks.

• Flexible PTO policy. Remote workday allocation.

• Company and team-bonding events happy hours and in-person camaraderie.

• Beautiful El Segundo headquarters close to the Pacific Ocean.

Total Compensation and Benefits
Radiant compensates people for impact and invests in those who continue to raise the bar. Radiants new hire compensation package includes base salary substantial equity grants and comprehensive health benefits. Total compensation and level are determined through a rigorous evaluation of interview performance experience education and qualifications and are designed to support continued growth as scope responsibility and impact expand at Radiant.

The best of todays advanced reactor builders dont wait for job postings. They join the winning team. If thats you contact us directly for immediate opportunities: .

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race color religion sex sexual orientation gender identity or expression pregnancy age national origin disability status genetic information protected veteran status or any other characteristic protected by law.

Unfortunately we are unable to provide visa sponsorship at this time.

This position involves access to technology that is subject to U.S. export controls. Any job offer made will be contingent upon the applicants capacity to serve in compliance with U.S. export controls.

Required Experience:

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