Linux Systems Administrator; Tier I

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The role supports a mission‑critical Department of Defense program dedicated to high‑performance computing operations. This position offers the opportunity to collaborate with senior engineers and system administrators to maintain and optimize advanced computing infrastructure. (This position is for potential upcoming work and does not represent an active opening at this time. Qualified candidates will be contacted once the position becomes available.)

• Perform general Systems Administrator functions supporting all HPC users with courteous responses to their HPC system operations and maintenance activities issues.
• Support Senior Systems Administrators in optimizing the functionality and performance of hardware and software components.
• Ensure availability, integrity, efficiency, and reliability of servers, workstations, and data storage systems (Lustre, Bright Cluster).
• Support other System Administrators in creating, administering, and managing Linux user accounts.
• Triage tier‑1 service desk tickets and produce service ticket reports and performance metrics.
• Support Linux SA and Engineering team in the installation and testing of HPC system components, including setup and configuration of:
• Hardware and software
• Computing and data storage servers
• Networking equipment
• Computing peripherals
• Provide responsive backup management, security issues, set up and configuration of Linux servers and software.
• Perform timely hardware replacement not covered by third‑party vendor maintenance agreements.
• Assist Network personnel in the configuration of networking equipment, ensuring network security, and managing firewalls.
• Implement necessary measures to comply with all Program security requirements.
• Adhere to all IT policies, processes, and procedures.
• Manage changing priorities.

Onsite in Arlington, VA

• Bachelor's degree in STEM discipline (e.g., CS, Engineering, Information Technology, etc.) and 5+ years of relevant experience.
• Current DoD 8140 IAT II Certification (e.g., Security+ CE).
• VMware vSphere 6 and up experience.
• Proficiency in scripting (BASH, Python, or Perl).
• Familiarity with Kubernetes, containerized technology, Ansible, and Postgre
  
  SQL.
• Knowledge of RMF, securing and hardening Linux systems to meet RMF controls.
• Knowledge of CUDA, Google Tensor Flow, or similar toolsets.

• Active Top Secret DoD security clearance (U.S. citizenship required).

Salary range: $70,000 – $150,000 (final compensation based on qualification and contract terms).

Sabre Systems, LLC has been providing innovative technological solutions and services for Department of Defense, federal civilian, and commercial customers for more than 35 years. We support advanced communication technologies, cyber, systems and software engineering, and digital transformation. We foster a welcoming, inclusive culture and prioritize employee well‑being and success.

We respect the unique perspectives that a diverse workforce brings. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex (including pregnancy, gender identity, and sexual orientation), national origin, age, disability, or genetic information. VEVRAA Federal Contractor.

Sabre Systems will never request payment, extend offers without an interview, or contact you from an email that doesn’t end in  Always apply directly at