Linux System Administrator

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

Job summary

Leidos is seeking a Linux System Administrator to join the Test and Training Enabling Architecture program in Alexandria, VA. The role focuses on maintaining Linux servers, enabling hybrid cloud migrations, and ensuring security for DoD networks within an enclave environment.

The position requires U.S. citizenship and an active Secret clearance, with DoD 8570 IAT I/III compliance. On-site work in Alexandria, VA is required.

Qualifications

• US Citizen with an active Secret clearance.
• Bachelor’s degree with 4+ years of experience or 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.
• DoD 8570 IAT level III 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

US Citizenship

Active Secret clearance

System Administration

DoD IT experience

DoD 8570 IAT level I

DoD 8570 IAT level III

Clearance compliance

Education

Bachelor’s degree + 4+ years

Master’s degree + 2+ years

Job description

Description

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.

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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:

August 11, 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 onlyand 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.

About Leidos

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 $16.7 billion for the fiscal year ended January 3, 2025. 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 at www.leidos.com/careers/pay-benefits .

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.

REQNUMBER: R-00189331

All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. Leidos will consider qualified applicants with criminal histories for employment in accordance with relevant Laws. Leidos is an equal opportunity employer/disability/vet.