Systems Administrator

*** To be considered for this role, you must be a US Citizen with an active US Government security clearance. Additionally, you must either live near or be willing to move to the Boulder, CO area.***

Centil , a Sabel Systems company, is a mission-focused engineering team supporting some of the highest-priority space defense programs in the U.S. Space Force portfolio, including missile defense and missile warning systems for Space Systems Command. Our work spans Dev Sec Ops , CI/CD product development, and space-domain systems engineering, and our people are embedded directly in the programs they support.

In January 2026, Sabel Systems acquired Centil to expand its Advanced Engineering Services capabilities. For our team, that means access to a broader portfolio of programs, deeper corporate resources, and new career pathways - while preserving the technical ownership and small-team culture that defines how we work. It’s an exciting time to join Centil: we’re growing, the mission portfolio is expanding, and we’re building the team that will define what comes next.

If you are interested in learning more about Centil or our team, check out our website til.io.

This position is for a Systems Administrator in Boulder, CO. You will work closely with a talented team to design, manage, secure and optimize the Information Technology (IT) infrastructure for one of our Department of Defense (DoD) clients. Additionally, you will be tasked with improving the overall project management discipline of our clients by increasing collaboration and innovation and introducing techniques that promote adaptability and flexibility in the face of unpredictable circumstances, and that optimize return on investment expenditures.

This role will focus on design, development, and maintenance of the critical IT systems for a new United States Space Force (USSF) program. Responsibilities will include building, patching, and maintaining computer systems for use across the program lifecycle. Your expertise and commitment to excellence will be vital in maintaining the reliability and performance on these systems in support of the nation’s defense.

This role is an on-site role, and requires, at a minimum, a current US Government Secret clearance, with a TS with SCI eligibility preferred.

• Provide system administration support
• Support version testing and evaluation, and provide feedback to the development and test community
• Assist Configuration Management in software upgrades and changes
• Monitor and correct system performance issues
• Shepherd development activities through the life cycle process by applying appropriate standards, processes, procedures and tools
• Prepare operating procedures/instructions and compile documentation during program development
• Analyze system capabilities to resolve questions of program intent, output requirements, input data acquisition, and program techniques and controls

• US Citizen with a current DoD Secret clearance or higher
• Minimum of five (5) years of experience in Systems Administration designing and maintaining IT systems (excluding help desk experience), with at least eight (8) preferred
• Experience with multiple stages of the program lifecycle (design, integration, test, operations, maintenance)
• Strong knowledge of Linux/RHEL operating systems and network administration
• Familiarity with DoD security regulations and frameworks, such as RMF (Risk Management Framework)
• Experience with virtualization technologies (VMware, Hyper‑V) and cloud services (AWS, Azure)
• Understanding of networking protocols, firewalls, and intrusion detection systems
• Ability to communicate technical information via oral presentation and written format

• Bachelor of Science degree in Computer Science or related technical field (equivalent training/job experience is also acceptable)
• Security certifications such as Security+, CISSP, or equivalent are highly desirable
• Experience working within an agile workflow
• Experience with Jira and Confluence
• Current TS, with SCI eligibility

In addition to job-specific requirements, Centil…