Software Engineering Manager - Simulation

Software Engineering Manager – Simulation

Radiant is an El Segundo, CA-based startup building the world’s first mass-produced, portable nuclear microreactors. The company’s first reactor, Kaleidos, is a 1-megawatt failsafe microreactor that can be transported anywhere power is needed and run for up to five years without refueling. Portable nuclear power with rapid deployment can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s approach uses modern software engineering to rapidly achieve safe, factory-built microreactors that leverage existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor next year at the Idaho National Laboratory, with initial customer deliveries in 2028.

About the Role

Radiant is seeking a Software Engineering Manager for Simulation to build and lead the engineering team responsible for reactor physics modeling, thermal-hydraulics simulations, and Digital Twin development. In this role you will scale 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.

Responsibilities

• Build, lead, and mentor a team of simulation engineers developing thermal, hydraulic, and nuclear models for reactor and subsystem physics.
• Guide technical architecture and implementation for simulation systems.
• 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 a strategy for model tuning as models evolve.
• Foster a culture of technical excellence by establishing best practices for simulation software development, code quality, and testing.
• Collaborate cross-functionally with Hardware, Nuclear, and Electrical engineering teams to accelerate software-in-the-loop and hardware-in-the-loop testing capabilities.
• Own team delivery of mission-critical internal simulation products while ensuring sustainable development practices and technical debt management.
• Recruit, develop, and retain top engineering talent and build a high-performance team culture.

Required Qualifications

Preferred Qualifications

Work Environment

Total Compensation & Benefits

Radiant’s new-hire compensation package includes base salary, substantial equity grants, and comprehensive benefits. Total compensation and level are determined through a holistic evaluation of interview performance, experience, education, and qualifications.

Benefits and Perks for Eligible Employees

Equal Opportunity Employment

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.

Seniority Level

Mid-Senior level

Employment Type

Full-time

Job Function

Engineering and Information Technology

Industry

Business Consulting and Services

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