Senior DevOps Engineer

Castelion is moving incredibly fast to develop and deliver advanced defense systems at a time when execution matters more than ever. We believe focus, ownership, and excellence are decisive advantages - and we're building a world-class team to turn bold ideas into real capability.

This is a rare opportunity to join at an early stage, where you'll have significant ownership, collaborate with exceptional teammates, and make a direct, measurable impact on our mission and the future of the company - regardless of your function.

Castelion is seeking a Senior DevOps Engineer to help scale and automate our software development and test infrastructure. This role will focus on closing the gap between required engineering tooling and automated processes across the software lifecycle.

You will design and implement CI/CD workflows, integrate software pipelines with hardware-in-the-loop (HIL) testing environments, and improve the reliability and efficiency of our development infrastructure. This role is ideal for engineers with backgrounds in DevOps, infrastructure engineering, or Site Reliability Engineering (SRE) who enjoy working close to both software and hardware teams to streamline complex engineering workflows.
Design, build, and maintain CI pipelines to support rapid and reliable software development and testing
Integrate CI workflows with hardware-in-the-loop (HIL) and automated test environments
Improve automation across build, test, deployment, and release processes
Design and manage development infrastructure supporting engineering teams
Maintain and improve containerized environments using Docker and Kubernetes
Support hybrid infrastructure across on-premise systems, lab environments, and cloud services
Implement and maintain tooling that supports embedded software, robotics, and simulation workflows
Integrate build systems, artifact management, and test frameworks into automated pipelines
Work closely with software, simulation, and hardware teams to remove bottlenecks in engineering workflows
Improve reliability, monitoring, and observability of internal development platforms
Implement monitoring and telemetry solutions using tools such as Grafana
Diagnose and resolve infrastructure, networking, and performance issues
Enforce secure development and infrastructure practices
Manage access controls, secrets management, and system configuration across environments

Bachelor's degree in Computer Science, Software Engineering, or a related field
7+ years of experience in DevOps, infrastructure engineering, or Site Reliability Engineering
Strong experience administering Linux-based systems
Proficiency in scripting languages such as Python, Bash, or Shell
Experience designing and maintaining CI/CD pipelines (Jenkins, GitHub Actions, or similar)
Hands-on experience with containerization and orchestration technologies (Docker, Kubernetes)
Strong understanding of Git and modern software development workflows
Experience troubleshooting infrastructure, networking, and build system issues
Castelion offers a generous benefits package. Please refer to the bottom of our Careers page for more details.  
Other Duties 
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties or responsibilities that are required of the employee for this job. Duties, responsibilities and activities may change at any time with or without notice. 
Additional Eligibility Requirements 
This position may require access to classified information or restricted U.S. Government sites, systems, or information, as determined by the Company and/or applicable U.S. Government requirements. If the position is so designated, your employment in the role may be contingent upon your ability to obtain and maintain the required U.S. Government security clearance or other government authorization, and to satisfy any citizenship or other eligibility requirements imposed by applicable law, regulation, executive order, or government contract requirements. You will be notified if and when such requirements apply. 
Affirmative Action/EEO Statement 
Castelion is an

Citizen