Senior Software Engineer, Radiant Nuclear
Simulation
$158-247.3k
+ Offers Equity
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
$158-247.3k
+ Offers Equity
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
- Bachelor's degree in physics, mechanical engineering, computer science, or a similar field, or equivalent experience
- 5+ years of professional software engineering experience with significant depth in simulation, scientific computing, or physics-based modeling
- Strong technical proficiency in programming languages such as Python, Rust, C#, or C/C++, with demonstrated ability to contribute to architectural decisions
- Experience working effectively within engineering teams in a collaborative technical environment
- Strong background in simulation tools, physics-based modeling, numerical methods, or computational science with proven ability to execute technical strategy
- Proficiency 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
- Proven ability to deliver high-quality hands-on technical contributions within a collaborative team environment
Desirable
- Advanced degree (Master's or Ph.D.) in physics, mechanical engineering, computer science, or a similar field
- Experience contributing to simulation or computational modeling, parallel computing, or high-performance computing projects
- 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 translate technical complexity for diverse audiences
- Experience with Machine Learning, Deep Learning, or other probabilistic modeling techniques
What the job involves
- About the Role Radiant is seeking an experienced Senior Software Engineer for Simulation to develop and implement solutions for reactor physics modeling, thermal-hydraulics simulations, and Digital Twin development.
- In this role, you will serve as a key technical contributor on a high-performing team while maintaining technical depth, ensuring our simulation infrastructure enables Radiant to design, test, and validate reactor systems—accelerating our path to commercialization
- Implement and contribute to technical architecture for simulation systems across thermal, hydraulic, and nuclear reactor physics models
- Collaborate with and support simulation engineers developing reactor and subsystem physics models
- Build and maintain software infrastructure to support Digital Twin simulation, visualization, and data processing capabilities
- Contribute to the technical roadmap for thermal and safety analysis simulation. Develop and execute strategies for model tuning as models and frameworks evolve
- Drive technical excellence by following and reinforcing best practices for simulation software development, code quality, and testing standards
- Collaborate cross-functionally with Hardware, Nuclear, and Electrical engineering teams to accelerate software-in-the-loop and hardware-in-the-loop testing capabilities
- Contribute to the delivery of mission-critical internal simulation products while ensuring sustainable development practices and technical debt management
- Support team growth through knowledge sharing and contributing to a high-performance engineering culture
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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