Senior DevOps Engineer

Job Overview

Senior DevOps Engineer

Location: El Segundo HQ

Employment Type: Full time

Location Type: On-site

Department: Engineering

Compensation: Annual Salary Range $133,500 – $218,925 • Offers Equity

About Radiant

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, fail-safe microreactor that can be transported anywhere power is needed and run for up to 5 years without refueling. 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 leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials. Founded in 2020, Radiant is on track to test its first reactor at the Idaho National Laboratory next year, with initial customer deliveries beginning in 2028.

Key Responsibilities

• 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.

Required Qualifications

• 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.

Desired Qualifications

• 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.