Senior Software Engineer - Simulation

Radiant is an El-Segundo, CA-based clean energy startup building a nuclear microreactor. A climate-friendly alternative to diesel generators, Radiant's Kaleidos 1MW microreactor will be the world's first portable, zero-emissions power source that works anywhere. We plan to test our development reactor by 2026 and if successful, it will be the first new commercial reactor design to achieve a fueled test in over 50 years. Radiant's goal is to bring one of the world's first factory-constructed microreactors to market. Our microreactor can bring power to remote parts of the world and provide backup power for life-saving applications in hospitals or disaster-relief scenarios.

Software Engineer - Simulation Responsibilities

Radiant is seeking a highly driven Software Engineer with a strong physics or mechanical engineering background. You will collaborate with mechanical, electrical, and nuclear teams to simulate physical systems with an appropriate degree of fidelity, write software that can be deployed 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 milestones forward to unlock commercialization of the first mass-produced nuclear reactor.

Responsibilities and Duties:

- Develop models to simulate reactor physics, thermal hydraulics, and other Kaleidos systems.

- Improve thermal fidelity of reactor components in the Digital Twin.

- Collaborate across teams to accelerate software-in-the-loop and hardware-in-the-loop testing.

- Own mission-critical internal products and tooling.

Required Qualifications And Skills

- Bachelor's degree in physics, mechanical engineering, or similar field from an accredited institution.

- 4+ years of professional experience in Python, C#, C++, or similar object-oriented programming languages.

- Familiarity with software development and documentation best practices, including version control in Git.

Desired Qualifications And Skills

- Advanced degree (Master's or Ph.D.) in physics, mechanical engineering, or similar field from an accredited institution.

- Highly self-motivated with strong communication skills.

- Experience writing or contributing to simulation tools.

- Experience with distributed software development and familiarity with common design patterns.

- Interest in physics, hardware, and electrical engineering.

Additional Requirements

- Must be willing to work extended hours and weekends as necessary to accomplish our mission.

- Must work 100% onsite at El Segundo HQ.

Employee Benefits For Eligible Employees

- Stock: Substantial incentive stock plan for all full time, salaried employees.

- Medical: 100% up to base silver level plan for employee + 50% dependents, offers up to Platinum plans.

- One Medical: Sponsored memberships for employees and their dependents.

- Vision: 100% top tier plan coverage + 50% for dependents.

- Dental: 100% top tier plan coverage, orthodontia extra, 50% for dependents.

- Voluntary Life, Accident, Hospital, Critical Illness, Commuter and FSA are offered as employee contributed benefits.

- Free snacks and drinks onsite.

- Flexible PTO policy.

We are an equal opportunity employer and all qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity or expression, pregnancy, age, national origin, disability status, genetic information, protected veteran status, or any other characteristic protected by law.

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.