Electrical Test Engineer

Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.

Job Overview

We are seeking a detail-oriented and innovative

Electrical Test Engineer

to join our multidisciplinary team. In this role, you will develop and execute testing strategies for the electrical systems critical to the operation of our SMRs, including power conversion, control systems, and instrumentation. You’ll be hands-on with prototype systems, working closely with design, firmware, and safety teams to ensure system integrity, performance, and compliance.

Key Responsibilities

- Write, execute, and document test plans for electrical subsystems including power electronics, control boards, wiring harnesses, and embedded systems.

- Build and maintain test setups and automated test infrastructure for validation and verification of electrical components.

- Troubleshoot and resolve issues during system integration and testing phases.

- Collaborate cross-functionally with mechanical, nuclear, and software teams to define interface requirements and ensure test coverage.

- Perform root cause analysis and recommend design improvements based on test data.

- Ensure compliance with applicable regulatory standards (e.g., NEC, IEEE, IEC, NRC guidelines).

- Contribute to safety analyses and quality documentation to support certification efforts.

Qualifications

- Bachelor’s or Master’s degree in Electrical Engineering, or a related field.

- 3+ years of experience in electrical test engineering, preferably in high-reliability or safety-critical environments (e.g., aerospace, automotive, energy).

- Strong knowledge of electrical circuit analysis, instrumentation, and test methodologies.

- Proficiency with lab equipment (oscilloscopes, power analyzers, DAQs) and test automation tools (Python, LabVIEW, etc.).

- Experience testing power electronics (DC-DC converters, inverters, etc.) and digital/analog circuits.

- Hands-on experience with PCB bring-up, debug, and failure analysis.

- Experience working with voltages up to 480VAC/1000VDC.

- Familiarity with nuclear or radiation-tolerant electronics is a plus.

- Excellent communication skills and ability to work in a fast-paced, team-oriented environment.

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.

Employee Benefits For Eligible Employees

- Stock: Substantial incentive stock plan for all full time, salaried 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 are offered as employee contributed benefits.

- Free snacks and drinks onsite.

- Flexible PTO policy.

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.