Senior Software Engineer, Radiant Nuclear
Simulation
Stock: Substantial incentive stock plan for all full time, salaried employees
More information about location
5 days a week in office (El Segundo, CA)
Making nuclear power portable
Open for applications
Making nuclear power portable
101-200 employees
Open for applications
Stock: Substantial incentive stock plan for all full time, salaried employees
More information about location
5 days a week in office (El Segundo, CA)
101-200 employees
Company mission
To bring one of the world's first factory-constructed microreactors to market.
Role
Who you are
- 5+ years of professional software engineering experience with significant depth in simulation, scientific computing, or physics-based modeling
- Strong proficiency in programming languages such as Python, Rust, C#, or C/C++
- Experience with simulation tools, physics-based modeling, numerical methods, or computational science
- Hands-on experience with numerical solvers, visualization frameworks, and automated testing approaches for scientific software
- Strong foundation in software engineering best practices, including version control, code review, and CI/CD pipelines
- Demonstrated ability to drive technical projects independently with minimal oversight
- Bachelor's degree in physics, mechanical engineering, computer science, or a similar field, or equivalent experience
- Must work 100% onsite at El Segundo HQ
- Must be willing to work extended hours and weekends as necessary to accomplish our mission
Desirable
- Advanced degree (Master's or Ph.D.) in physics, mechanical engineering, computer science, or a similar field
- Experience with simulation or computational modeling, parallel computing, or high-performance computing
- Background with modern simulation frameworks, finite element analysis, or computational fluid dynamics tools
- Track record of successful cross-functional collaboration with Hardware, Nuclear, and Electrical engineering teams
- Strong communication skills with the ability to explain technical concepts to diverse audiences
- Experience with Machine Learning, Deep Learning, AI, or other probabilistic modeling techniques
What the job involves
- You will collaborate with mechanical, electrical, and nuclear teams to simulate physical systems with an appropriate degree of fidelity, write software for deployment to production hardware, and improve our simulation and test software stack, including our cutting-edge, custom-built Digital Twin system
- You will have an opportunity to work in an interdisciplinary environment with a high degree of ownership and drive to move milestones forward to unlock the commercialization of the first mass-produced nuclear reactor
- Develop thermal, hydraulic, and nuclear models for reactor and reactor subsystem physics
- Design and implement technical architecture for simulation systems
- Build software infrastructure to support Digital Twin simulation, visualization, and data processing capabilities
- Contribute to the technical roadmap for thermal and safety analysis simulation. Implement model tuning strategies as models and frameworks evolve
- Establish and champion best practices for simulation software development, code quality, and testing
- Collaborate with Hardware, Nuclear, and Electrical engineering teams to develop software-in-the-loop and hardware-in-the-loop testing capabilities
- Deliver mission-critical internal simulation products while maintaining code quality and managing technical debt
- Mentor junior engineers and contribute to building a high-performance team culture
Our take
To support the clean energy revolution, Radiant Nuclear is developing a portable, containerized 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 centers.
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 realizing its microreactor (known as Kaleidos). 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 6 rounds)
May 2025
$165m
SERIES C
Nov 2024
$100m
SERIES C
Total funding: $320.7m
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.
Victoria (Baggio) S.
(COO)Began at the company as Head of Operations before becoming COO. Previously a Consultant at Happy Returns by PayPal and Director of Customer Service at McMaster-Carr.
Salary benchmarks
We don't have enough data yet to provide salary benchmarks for this role.
Submit your salary to help other candidates with crowdsourced salary estimates.
Share this job
View 16 more jobs at Radiant Nuclear