Software Engineer - Full Stack 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 and other Kaleidos systems. * Improve representations 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 engineering, physics, 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: * 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 achieve company goals. * Must work 100% onsite at El Segundo HQ.