Senior Embedded Software Engineer, Radiant Nuclear
$158-219.4k
+ Equity
More information about location
5 days a week in office (El Segundo, CA)
Making nuclear power portable
Job no longer available
Making nuclear power portable
201-500 employees
Job no longer available
$158-219.4k
+ Equity
More information about location
5 days a week in office (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
- The ideal candidate will be comfortable working in early design stages and owning designs through production
- Bachelor's degree in computer engineering, computer science, electrical engineering, or a related field
- 5+ years of industry experience in embedded software, including 1+ year of design and architecture ownership
- Hands-on experience with an RTOS (Zephyr, NuttX, ThreadX, etc.)
- Proficiency in C and C++
- Self-directed and proactive — able to operate with autonomy in a fast-moving environment
- Strong communicator with the ability to align cross-functional peers and management
Desirable
- Experience with Zephyr RTOS
- Experience working with Simulink Autocode C++ export
- Experience with CMake
- Comfortable reading and interpreting hardware schematic
What the job involves
- Radiant is seeking a Senior Embedded Software Engineer to design, develop, and test embedded software for instrumentation and control (I&C) systems
- You will develop mission-critical, highly performant embedded systems to interface with sensors and actuators at the heart of a first-of-its-kind energy platform
- You will have the opportunity to build mission-critical software control systems for the first commercialized portable nuclear microreactor — technology that will redefine how the world accesses clean, reliable power
- Design and build reliable, fault-tolerant embedded software for production hardware operating in demanding environments
- Develop and bring up new drivers for I&C hardware across a range of sensing and actuation subsystems
- Lead design reviews, solicit feedback, and drive iterative improvements across the team
- Own the full engineering lifecycle — from architectural design through test, build, and field implementation
- Create robust testing plans, validation frameworks, and thorough documentation that meet rigorous safety standards
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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