Linux System Administrator

Leidos LLC; Alexandria (VA); On-site; USD 87,000 - 157,000; Full time

Job summary

Leidos is seeking a Linux System Administrator in Alexandria, VA to install and maintain Linux servers, lead cross-functional features, and secure DoD enclave infrastructure. The role requires active Secret clearance and DoD 8570 IAT Level I compliance. On-site work in the Alexandria office is required.

Responsibilities include network gear management, system service configuration, and security monitoring to sustain reliable operations and security posture for DoD clients.

Qualifications

• US Citizen with active Secret clearance.
• Bachelor’s degree with 4+ years of experience or a Master’s degree with 2+ years of experience.
• 4+ years of experience providing System Administration to DoD IT systems.
• DoD 8570 IAT level I compliant.

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 DHCP, 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.

Skills

Linux administration

Networking

Security monitoring

DoD requirements

Education

Bachelor's degree

Master's degree

Tools

Apache Web Server

Tomcat

MariaDB

DNS

DHCP

Atlassian applications

Job description

Linux System Administrator Alexandria, VA Secret clearance or higher The Test and Training Enabling Architecture (TENA) program at Leidos is looking to add a 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 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 4+ years of experience or a Master’s degree with 2+ years of experience.
• Additional experience may be considered in lieu of a degree.
• 4+ years of experience providing System Administration to DoD IT systems.
• DoD 8570 IAT level I compliant.

Preferred Qualifications:

• 6+ years of experience providing System Administration to DoD IT systems.
• DoD 8570 IAT level III compliant.
• DABAOPP1

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: September 23, 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 $87,100.00 - $157,450.00 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.

Leidos is an industry and technology leader serving government and commercial customers with smarter, more efficient digital and mission innovations. Headquartered in Reston, Virginia, with 47,000 global employees, Leidos reported annual revenues of approximately $17.2 billion for the fiscal year ended January 2, 2026. For more information, visit www.Leidos.com.

Pay and Benefits Pay and benefits are fundamental to any career decision. That's why we craft compensation packages that reflect the importance of the work we do for our customers. Employment benefits include competitive compensation, Health and Wellness programs, Income Protection, Paid Leave and Retirement. More details are available here.

Securing Your Data Leidos will never ask you to provide payment-related information at any part of the employment application process. And Leidos will communicate with you only through emails that are sent from a Leidos.com email address. If you receive an email purporting to be from Leidos that asks for payment-related information or any other personal information, please report the email to [e-mail].

Commitment and Diversity All qualified applicants will receive consideration for employment without regard to sex, race, ethnicity, age, national origin, citizenship, religion, physical or mental disability, medical condition, genetic information, pregnancy, family structure, marital status, ancestry, domestic partner status, sexual orientation, gender identity or expression, veteran or military status, or any other basis prohibited by law. Leidos will also consider for employment qualified applicants with criminal histories consistent with relevant laws.