Staff/Principal Software Engineer, Radiant Nuclear

• Bachelor's degree in computer science, physics, mechanical engineering, or a related engineering field
• 6+ years of professional software engineering experience with deep expertise in developer productivity, software tooling, infrastructure, high-performance computing (HPC), or platform engineering.
• Expert-level proficiency in programming languages such as Python, Golang, Rust, C#, or C/C++
• Deep understanding of system design, data structures, algorithms, and distributed systems architecture with a track record of designing systems from the ground up
• Strong foundation in software engineering best practices, including version control, code review, testing, and CI/CD methodologies
• Extensive hands-on experience in distributed software development, building systems, and infrastructure automation
• Expert-level knowledge of containerization (Docker), orchestration (Kubernetes), and infrastructure-as-code tools (Terraform, Ansible, etc.)
• Significant experience architecting and implementing systems in hybrid cloud/on-premises environments, specifically AWS and Linux
• Familiarity with Git version control, Docker containerization, and common CI/CD frameworks (ArgoCD, GitHub Actions, GitLab CI/CD, Jenkins, CircleCI, Azure Pipelines, or similar) for automated build and deployment pipelines
• Must work 100% onsite at El Segundo HQ
• Must be willing to work extended hours and weekends as necessary to accomplish our mission

Desirable

• Radiant is seeking a Senior Software Engineer for Internal Tools & Infrastructure to develop the software infrastructure, developer tooling, and data processing capabilities that power our engineering organization
• In this deeply technical role, you will design and implement platform systems that enable faster iteration on reactor designs, sophisticated Digital Twin simulation and visualization, and data-driven analysis across the company
• You will work in a highly interdisciplinary environment to solve complex technical challenges that accelerate our path to deploying the world's first mass-produced nuclear reactor
• Develop and implement core infrastructure systems for internal tools, compute platforms, CI/CD pipelines, and data processing at scale
• Design and build internal developer tooling, including CI/CD pipelines, version control systems, artifact management, build systems, developer environments, testing frameworks, and release processes
• Hands-on development of full-stack web applications that provide real-time monitoring, Digital Twin visualizations, simulation post-processing, and analysis tools for Kaleidos reactor systems
• Build infrastructure and tooling necessary to maintain high-quality standards and detect issues in real time across engineering systems
• Collaborate on technical initiatives across software, simulation, electrical, mechanical, and nuclear teams
• Work across teams to integrate software with hardware platforms, control systems, and external software tools
• Design and build internal developer tooling, scientific tooling, including CI/CD pipelines, version control systems, artifact management, build systems, developer environments, testing frameworks, and release processes

• 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