Senior Linux System Administrator

The Test and Training Enabling Architecture (TENA) program at Leidos is looking to add a Senior Linux System Administrator. Our mission is to develop tools for the United States Department of Defense test and training communities, to increase the speed of the development cycle, to get capabilities to the warfighter more rapidly. The Senior Linux System Administrator will work within a team engineers, developers and system administrators, adding new capabilities to our enclaves, as well as ensuring the existing systems are secure and performing as intended.

This position is required to work on-site in our Alexandria, VA office. Primary Responsibilities:

• Provide support for installing and maintaining Linux servers.
• Provide technical leadership for migrating on premise infrastructure to hybrid cloud solution.
• Provide support for troubleshooting from OS to application-level issues.
• Manage networking equipment including switches, routers and firewalls.
• Manage configuration and maintenance of core enclave infrastructure services including DCHP, DNS, e-mail, Apache Web Servers, Tomcat application servers, Atlassian applications, MariaDB database servers.
• Configure and monitor security tools required for DoD networks.
• Participate and contribute to design discussions related to improving the capabilities, performance and security posture of new and existing services.

Basic Qualifications:

• US Citizen with at least an active Secret clearance.
• Bachelor’s degree with 8+ years of experience or a Master’s degree with 6+ years of experience. Additional experience may be considered in lieu of a degree.
• 5+ years of experience providing System Administration to DoD IT systems.
• DoD 8570 IAT level I compliant.

Preferred Qualifications:

• 10+ years of experience providing System Administration to DoD IT systems.
• DoD 8570 IAT level III compliant.

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If you're looking for comfort, keep scrolling. At Leidos, we outthink, outbuild, and outpace the status quo — because the mission demands it. We're not hiring followers. We're recruiting the ones who disrupt, provoke, and refuse to fail. Step 10 is ancient history. We're already at step 30 — and moving faster than anyone else dares.

Original Posting:

June 4, 2026

For U.S. Positions: While subject to change based on business needs, Leidos reasonably anticipates that this job requisition will remain open for at least 3 days with an anticipated close date of no earlier than 3 days after the original posting date as listed above.

Pay Range:

Pay Range $107,900.00 - $195,050.00

The Leidos pay range for this job level is a general guideline only and not a guarantee of compensation or salary. Additional factors considered in extending an offer include (but are not limited to) responsibilities of the job, education, experience, knowledge, skills, and abilities, as well as internal equity, alignment with market data, applicable bargaining agreement (if any), or other law.