Senior Software Engineer, Simulation

Radiant Industries•El Segundo, CA

1d•Onsite

About The Position

Radiant is seeking an experienced Senior Software Engineer to design and implement robust software systems that power our reactor simulation and Digital Twin capabilities. In this role, you will serve as a key technical contributor on a high-performing team, owning the architecture, tooling, and infrastructure—including evaluation and integration of frameworks, third-party software, and simulation tools—that enables our simulation engineers to model, test, and validate reactor systems—accelerating our path to commercialization.

Requirements

Bachelor's degree in physics, mechanical engineering, computer science, or a similar field.
5+ years of professional software engineering experience with significant depth in high performance computing (HPC), computational science, Machine Learning, or a related advanced computing field.
Expert-level proficiency in programming languages such as Python, Rust, or C/C++.
Strong background in 3rd party simulation tools, physics-based modeling, numerical methods, or computational science with proven ability to execute technical strategy.
Proficiency with visualization frameworks, open source platforms, 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.

Nice To Haves

Advanced degree (Master's or Ph.D.) in physics, computer science, mechanical engineering, 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.
Experience with Machine Learning, Deep Learning, or other probabilistic modeling techniques.
Experience in highly regulated industries (aerospace, defense, automotive, nuclear, or medical devices).

Responsibilities

Implement and contribute to software architecture for simulation systems across thermal, hydraulic, and nuclear reactor multi-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.
Evaluate and recommend third-party software tools, open source libraries, and simulation frameworks for adoption by the team.
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.

Benefits

Substantial incentive stock plan for all full-time employees.
100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.
Sponsored memberships for employees and their dependents.
100% top tier plan coverage + 50% for dependents.
100% top tier plan coverage, orthodontia extra, 50% for dependents.
Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.
8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.
Daily catered lunch.
Free snacks and drinks.
Flexible PTO policy.
Remote workday allocation.
Company and team-bonding events, happy hours and in-person camaraderie.
Beautiful El Segundo headquarters close to the Pacific Ocean.