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.

Role Overview

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.

Responsibilities

• 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

Basic Qualifications

• 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 Equal Opportunity Employer. We are committed to providing equal employment opportunities to all applicants and employees without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, age, disability, genetic information, protected veteran status, or any other characteristic protected by applicable federal, state, or local law.

Castelion is committed to providing reasonable accommodations to qualified individuals with disabilities throughout the application and hiring process. If you require a reasonable accommodation to complete an application, participate in the interview process, or otherwise participate in the hiring process, please contact View email address on click.appcast.io. Requests for accommodation will be considered on an individual basis and handled in accordance with applicable law.

Castelion is committed to fostering a workplace where employment decisions are based on qualifications, business needs, and the ability to perform the essential functions of the role, with or without reasonable accommodation.

This position requires access to export-controlled information, and as such, employment (or hiring of a contractor) is contingent upon the candidate’s ability to access all applicable export-controlled information without additional export licensing being required by the Bureau of Industry and Security and/or the Directorate of Defense Trade Controls.