Radiant is seeking an experienced Lead Software Engineer for Simulation to mentor and lead the engineering team responsible for reactor physics modeling, thermal-hydraulics simulations, and Digital Twin development. In this role, you will serve as the technical lead for 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.
Requirements
- 8+ years of professional software engineering experience with significant depth in simulation, scientific computing, or physics-based modeling.
- Deep technical expertise in programming languages such as Python, Rust, C, or C/C++, with demonstrated ability to drive architectural decisions.
- Experience providing technical leadership and mentorship to engineering teams.
- Strong background in simulation tools, physics-based modeling, numerical methods, or computational science with proven ability to guide technical strategy.
- Expertise 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 balance hands-on technical contributions with technical leadership and mentorship.
Responsibilities
- Lead technical architecture and implementation for simulation systems across thermal, hydraulic, and nuclear reactor physics models.
- Mentor and provide technical guidance to simulation engineers developing reactor and subsystem physics models.
- Design and scale software infrastructure to support Digital Twin simulation, visualization, and data processing capabilities.
- Define and own 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 establishing 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.
Other
- Must work 100% onsite at El Segundo HQ.
- Must be willing to work extended hours and weekends as necessary to accomplish our mission.
- Unfortunately, we are unable to provide visa sponsorship at this time.
- 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.
- Bachelor's degree in physics, mechanical engineering, computer science, or a similar field, or equivalent experience
