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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. 

 

Senior Software Engineer

Radiant is seeking a driven Senior Software Engineer to work on simulation and analysis. In this role, you will collaborate with the Digital Twin team to improve simulation performance, build data analysis tools, and automate test suites for software verification. 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:

• Design and implement features in our simulation stack to provide an exceptional developer experience for internal users.
• Own simulation automation and runtime performance to enable efficient and compliant safety analysis.
• Collaborate across teams to streamline Digital Twin implementation workflow.
• Define, develop, and maintain various mission-critical internal tools.

Required Qualifications and Skills:

• Bachelor’s degree in computer science or engineering.
• 5+ years of professional experience in Python, C++, C#, or similar object-oriented programming languages.
• Familiarity with Git, Docker, and common CI/CD frameworks.

Desired Qualifications and Skills:

• Highly self-motivated with strong communication skills.
• Experience writing or contributing to simulation tools.
• Experience testing software and hardware systems.
• 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.