Senior DevOps Engineer

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 the need to refuel. Portable nuclear power with rapid deploy capability can replace similar-sized diesel generators, and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development utilizes 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 beginning in 2028.

Senior DevOps Engineer

Radiant is seeking a driven Sr DevOps Engineer to lead software infrastructure, deployment, and automation projects. In this role, you will collaborate across the entire org and work closely with the software team to design scalable, secure, and resilient DevOps practices, tools, and systems. The infrastructure you manage, pipelines you build, and analysis tools you create and maintain will be used to design, run, and analyze the first new reactor design in 50 years. You will have the opportunity to build a strong foundation for production.

Responsibilities And Duties

- Architect, implement, and maintain infrastructure across AWS and on-premises Linux environments, ensuring high availability, security, and performance for mission-critical systems.

- Own and optimize Kubernetes and Docker container orchestration to run simulations, internal tools, and engineering applications at scale.

- Design, build, and optimize CI/CD pipelines using Git, Argo, and other automation tools to enable rapid, reliable software delivery across engineering teams.

- Develop internal tools supporting build systems, testing frameworks, deployment automation, and developer environments.

- Develop computational analysis tools for the digital twin platform, implementing automated profiling and monitoring to optimize HPC workloads for reactor modeling.

- Implement and manage infrastructure-as-code practices using Terraform or similar tools to ensure reproducible, version-controlled infrastructure deployments.

- Establish and maintain observability, monitoring, and logging infrastructure to ensure system reliability and enable rapid incident response.

- Design and maintain high-performance networking infrastructure for distributed simulation systems, optimizing data transfer between HPC clusters.

- Work across engineering teams to understand infrastructure requirements and eliminate bottlenecks that impact development velocity.

- Own the technical direction of platform infrastructure and establish standards for deployment, monitoring, and operational excellence.

Required Qualifications And Skills

- Bachelor's degree in computer science, engineering, or a related technical field.

- 8+ years of professional experience in DevOps, Site Reliability, Infrastructure, or Platform Engineering. - Expert-level proficiency in programming languages such as Python, Golang, Rust, C#, or C/C++.

- Expert-level proficiency with Kubernetes and Docker for orchestration and deployment.

- Experience with Git and CI/CD tools (Argo, GitLab CI, Jenkins, GitHub Actions), designing automated build, test, and deployment pipelines.

- Strong coding skills, developing automation and monitoring tools, internal applications, and infrastructure software.

- Ability to work from Radiant's office in El Segundo, CA (greater Los Angeles), full-time

Desired Qualifications And Skills

- Experience deploying and maintaining cloud-native applications in production, including hands-on work with microservices, architectures, service mesh technologies, and distributed systems.

- Familiarity with infrastructure monitoring and observability tools like Datadog, Grafana, InfluxDB, Prometheus, Nagios, etc.

- Working experience in secrets management, Identity and access management, network security, vulnerability scanning, etc.

- Experience in highly regulated industries (aerospace, defense, automotive, nuclear, or medical devices).

- Passion for clean, maintainable code and building automation that enhances developer productivity and accelerates engineering velocity.

- Experience working cross-functionally with engineering teams in different disciplines such as mechanical, electrical, materials, and nuclear.

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.

Total Compensation And 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 your interview performance, experience, education, and qualifications.

Benefits And Perks For Eligible Employees

- Stock: Substantial incentive stock plan for all full-time employees. - Medical: 100% premium coverage for base Silver level plan for employee + 50% premium coverage for dependents. Platinum plans available.

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

- Vision: 100% premium coverage for top tier plan + 50% for dependents. - Dental: 100% premium coverage for top tier plan (including orthodontia) + 50% for dependents.

- Voluntary life, accident, hospital, critical illness, commuter and FSA/HSA are offered as employee contributed benefits.

- 8-weeks of paid parental leave for all parents. Additional paid pregnancy leave for CA employees.

- Daily catered lunch. Free snacks and drinks.

- Flexible PTO policy. Remote workday allocation.

- Company and team-bonding events, happy hours and in-person camaraderie.

- Beautiful El Segundo headquarters close to the Pacific Ocean.

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.