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ABOUT RADIANT 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, 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. Radiant’s 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 to lead the electrical system architecture and test infrastructure for Kaleidos, Radiant's commercial microreactor unit targeted for deployment in 2028. You will own end-to-end electrical integration, from early architecture and requirements definition through hardware bring-up, testing, and commissioning, and serve as the technical authority, ensuring the electrical and validation systems are ready to support that milestone. The ideal candidate brings deep electrical engineering expertise, strong systems-level thinking, and a track record of leading complex hardware programs from concept to deployment. You are equally comfortable making architecture decisions independently and collaborating across mechanical, software, and systems engineering teams. RESPONSIBILITIES & DUTIES - Define and own electrical and software integration requirements spanning power distribution, signal conditioning, sensor mapping, actuator interfaces, and device simulation. - Own and build out the electrical test infrastructure for Kaleidos, and establish the test environment as a foundational asset to validate the commercial unit ahead of the 2028 deployment target. - Establish and maintain communication between hardware, control systems, and software interfaces. - Define and drive electrical validation strategy; develop test procedures, methodologies, and best practices. - Manage schedule, budget, and vendor management for electrical hardware and integration activities. - Optimize test and validation processes; develop tooling and automation to improve efficiency. - Support electrical integration across multiple critical systems and subsystems. - Lead design reviews and effectively communicate technical decisions to cross-functional stakeholders. (Electrical integration, embedded, software, controls.) REQUIRED QUALIFICATIONS - BS in Electrical Engineering or related discipline from an accredited institution. - 10+ years of progressive electrical engineering experience, including hands-on hardware design, integration, and test. - Demonstrated experience setting technical direction, mentoring engineers, and driving programs with significant scope and ambiguity. - Demonstrated ability to work under tight timelines and deliver a functional product that meets requirements. - Experience with DAQ and test systems (e.g., NI PXI, dSpace, Speedgoat, or similar platforms). - Proficiency with software and scripting environments (e.g., LabVIEW, TestStand) - Proficiency with data acquisition systems, test execution, and validation frameworks. - Strong electrical and software debugging and root cause analysis skills. - Experience working cross-functionally with software, mechanical, and systems engineering teams. - Proficiency in at least one scripting or programming language (Python, C++, C#, or similar). DESIRED QUALIFICATIONS: - MS or PhD in Electrical Engineering, or a related discipline. - Familiarity with real-time simulation systems and/or FPGA-based hardware. - Experience with controls fu