Principal Electrical Engineer (Integration & Test)

• Radiant is seeking a Principal Electrical Engineer to lead the electrical system architecture and test infrastructure for Kaleidos, our commercial microreactor targeted for deployment in 2028
• You will own end-to-end electrical integration, from architecture and requirements definition through hardware bring-up, testing, and commissioning, and lead the development of Hardware-in-the-Loop (HIL) systems and the broader test environment that validates the reactor before it reaches the field
• As the technical authority across electrical integration and validation strategy, you will set direction independently while collaborating across mechanical, software, and systems engineering
• You will define the electrical architecture behind the first commercialized portable microreactor as we begin deploying to our customers in 2028
• Build the HIL platform from the ground up: plant simulation, real hardware in the loop, and the test environment Kaleidos ultimately ships from
• Own the design, build, and maintenance of electrical test infrastructure, establishing it as a foundational asset for validating the commercial unit ahead of 2028
• Define and own electrical and software integration requirements across power distribution, signal conditioning, sensor mapping, actuator interfaces, and device simulation
• Own the communication layer between hardware, control systems, and software protocol selection, timing, and fault behavior at the boundaries
• Define and drive the electrical validation strategy, developing the test procedures and methodologies the program depends on
• Own schedule, budget, and vendor management for electrical hardware and integration activities
• Drive automation and tooling improvements, with real influence over how the team tests
• Lead design reviews and carry technical decisions to stakeholders across electrical integration, embedded, software, and controls

Benefits

• Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans
• Equity: Substantial incentive stock plan for all salaried employees
• Flexible PTO policy
• Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits
• Vision: 100% coverage + 50% for dependents
• Dental: 100% coverage, orthodontia extra, 50% for dependent
• Team-bonding company outings, happy hours and in-person camaraderie
• Beautiful El Segundo headquarters close to the Pacific Ocean

• Proficiency with test software and scripting environments (LabVIEW, TestStand) and at least one programming language (Python, C++, C#, or similar)
• Experience with DAQ and test systems (NI PXI, dSPACE, Speedgoat, or similar), including test execution and validation frameworks
• Proven ability to deliver a functional product that meets requirements under tight timelines
• 8+ 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
• Strong electrical and software debugging and root cause analysis skills
• BS in Electrical Engineering or a related discipline from an accredited institution
• 5+ years developing hardware-in-the-loop (HIL) systems, including signal conditioning, DAQ/IO interfaces, plant model integration, and embedded controls validation
• Background in high-reliability, safety-critical, or regulated environments (aerospace, defense, nuclear, medical, or automotive)
• Experience working cross-functionally with software, mechanical, and systems engineering teams
• Familiarity with real-time simulation systems and/or FPGA-based hardware
• Hands-on experience with trace capture, data acquisition, and analysis tools
• Experience with controls fundamentals and software testing processes
• MS in Electrical Engineering or a related discipline
• Must work 100% onsite at El Segundo HQ
• Must be willing to work extended hours and weekends as necessary to accomplish our mission

• 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