Senior FPGA Engineer; El Segundo, California,

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without the need to refuel. 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.

Radiant’s unique, practical approach to nuclear development utilizes modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries beginning in 2028.

Radiant is seeking a driven FPGA Engineer to contract with our Embedded Systems team. You will be responsible for designing, developing, and validating FPGAs used in the reactor instrumentation and control system for safety critical applications, sensor and actuator handling, and communication systems. This role requires working with hardware engineers, embedded software engineers, and test engineers in a cross-functional setting to develop cohesive designs that meet the demands of controlling and monitoring fission reactors.

You will be a key contributor in testing the first commercial reactor design in over 50 years.

This role is based onsite full-time in El Segundo, CA.

• Onsite, 40 hours a week minimum.
• Own the design of sensor processing systems from concept to integration.
• Implement logic designs in VHDL.
• Write automated verification tests.
• Work directly with embedded software engineers to deliver complete products.
• Collaborate with cross-functional mechanical, software, and control teams.

• Bachelor’s degree in computer engineering, electrical engineering, or a related field.
• 5+ years of experience working with FPGAs.
• Knowledge of VHDL.
• Experience troubleshooting timing closure issues.
• Experience with multi‑clock designs.
• Understanding of verification methodologies and frameworks.

• Experience with embedded C/C++.
• Experience with Microchip Polar Fire SoC platform.
• Experience with Linux and bash shell scripting.
• Experience with Docker.
• Excellent documentation skills and ability to collaborate in multidisciplinary environments.
• Cross‑functional team with embedded software, FPGA, and hardware all together.
• Opportunities for technical growth outside of pure software.
• Opportunity to own designs from concept to completion.

This is a non‑exempt hourly role eligible for overtime pay.

$50 – $150 USD

Radiant compensates people for impact and invests in those who continue to raise the bar. Radiant’s 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.

• Stock:
  Substantial incentive stock plan for all full‑time employees.
• Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.
• One Medical:
  Sponsored memberships for eligible employees and their 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.
• Burgeoning satellite offices in Oak Ridge, TN and Washington, D.C., near Capitol Hill.

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 applicant’s capacity to serve in compliance with U.S. export controls.

For immediate opportunities or to discuss this role further, contact us directly at