Software Engineer, Radiant Nuclear
HIL
$124.5-172.7k
+ Incentive Stock Plan
Office located in El Segundo, CA
Making nuclear power portable
Be an early applicant
Making nuclear power portable
201-500 employees
Be an early applicant
$124.5-172.7k
+ Incentive Stock Plan
Office located in El Segundo, CA
201-500 employees
Company mission
To bring one of the world's first factory-constructed microreactors to market.
Role
Who you are
- BS in Electrical Engineering, Computer Engineering, Mechanical Engineering, Computer Science, or a related field
- 3+ years developing hardware-in-the-loop systems
- Proficient in designing, implementing, and debugging software within HIL frameworks (dSPACE, Speedgoat, etc.)
- Hands-on experience with automated test case development and generating comprehensive test reports
- Experience in MATLAB or Python for data processing, analysis, and visualization
- Skilled in electrical debugging and root cause analysis
- Must be willing to work extended hours and weekends as necessary to accomplish our mission
- Must work 100% onsite at El Segundo HQ
Desirable
- Practical knowledge of the fundamental concepts of controls, software testing, and test processes
- Hands-on skills to design, build, bring up, and debug test benches
- Experience with real-time simulation systems and FPGA-based hardware
- Strong understanding of control fundamentals and software testing processes
- Experience with trace capture tools or data acquisition and analysis tools
- Background in high-reliability, safety-critical, or regulated industry environments (aerospace, defense, nuclear, medical, or automotive)
What the job involves
- Radiant is seeking a Hardware-in-the-Loop (HiL) Engineer to develop Radiant’s HiL systems for current and future products
- In this role, you will be responsible for end-to-end development, including defining system requirements; supporting hardware sourcing and development; developing the software architecture; developing and maintaining the HiL software; developing and maintaining test automation; and supporting integration testing
- This role is ideal for candidates comfortable working both autonomously and with an interdisciplinary team, as well as in early design architecture phases of development
- You will have the opportunity to build electrical integration systems from the ground up that will drive success towards the first high-temperature gas-cooled portable microreactor ever to be commercialized
- Design, develop, and maintain hardware-in-the-loop (HIL) test bench systems
- Develop and maintain the HiL systems plant software
- Support building and configuring test hardware, including power supplies, actuator modeling, and sensor mapping
- Support integrating the HiL software with physics simulation models, including thermal, neutronics, and power generation simulation models
- Own schedule and vendor management for the HIL systems
- Own communication and integration between hardware, control systems, and software interfaces
- Drive optimization of test and validation processes and lead improvements in tooling and automation
- Support the planning, development, and execution of integration tests
- Lead design reviews and communicate technical decisions to cross-functional stakeholders
Our take
To support the clean energy revolution, Radiant Nuclear is developing a portable, containerised nuclear microreactor. Once launched, it will have the potential to provide power to remote parts of the world or act as a backup supply to vital infrastructure such as hospitals and data centres.
Typically, these backup systems are powered by diesel generators - making them extremely bad for the environment. Radiant's microreactors could allow the replacement of these generators whilst supplying the same critical asset support, enabling a substantial reduction in carbon footprint.
Having completed the design phase of the project, Radiant has taken a step closer towards realising its portable microreactor (known as Kaleidos). On the back of impressive Series D funding, the company intends to test a prototype as early as mid-2026 and has secured considerable funding to support its work towards that goal.
Kirsty
Company Specialist at Welcome to the Jungle
Company
Funding (last 2 of 7 rounds)
Dec 2025
$300m
SERIES D
May 2025
$165m
SERIES C
Total funding: $620.7m
Company benefits
- Equity: Substantial incentive stock plan for all salaried employees
- Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans
- Vision: 100% coverage + 50% for dependents
- Dental: 100% coverage, orthodontia extra, 50% for dependent
- Flexible PTO policy
- Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits
- Team-bonding company outings, happy hours and in-person camaraderie
- Beautiful El Segundo headquarters close to the Pacific Ocean
Company HQ
El Segundo, CA
Leadership
Doug Bernauer
(CEO)Previously Senior Avionics Systems Engineer at Space Exploration Technologies and Applications Engineer at Rockwell Automation.
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