Senior System Administrator

About Leidos

Leidos is a FORTUNE 500® company bringing a mix of innovative technology and sector expertise to customers in the national security, engineering, and health industries. We deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customers' success. Guided by our Mission, Vision, and Values, Leidos empowers its teams, contributes to its communities, and operates sustainably—always with a commitment to doing the right thing for our customers, our people, and our community.

The Leidos Intel Sector combines technology-enabled services and mission software capabilities in the areas of cyber, logistics, security operations, and decision analytics to support Intelligence Community customers as they address evolving national security challenges.

About the Opportunity

Leidos is seeking an experienced Senior System Administrator to support the implementation, operation, troubleshooting, and maintenance of IT systems and infrastructure. You will manage day-to-day system operations across client/server, storage, network, mobile, and virtual environments while diagnosing technical problems and supporting reliable system performance.

You will administer UNIX, Linux, Windows, and virtual operating environments; support escalated technical issues; configure network components; implement operating-system enhancements; and provide detailed technical analysis to agency management and internal customers.

Why This Role Matters

Reliable IT infrastructure requires experienced administrators who can move beyond routine operations to diagnose complex problems, support escalated issues, maintain system integrity, and improve performance.

As a Senior System Administrator, you will help ensure critical IT systems remain available, reliable, secure, and responsive to operational needs.

What You'll Do

Systems & Infrastructure Administration

• Manage daily configuration and operation of IT systems.

• Support implementation, troubleshooting, and maintenance of IT systems and associated infrastructure.

• Monitor and support day-to-day operations across client/server, storage, network, mobile, and related devices.

• Configure and manage UNIX, Linux, Windows, virtual, and other applicable operating-system environments.

• Install and load operating-system software, troubleshoot system issues, and maintain system integrity.

• Configure network components and implement operating-system enhancements to improve reliability and performance.

• Optimize system operations and resource utilization and perform system-capacity analysis and planning.

• Support security and STE/STN compliance of system software and hardware as required.

Advanced Troubleshooting & User Support

• Provide in-depth troubleshooting of IT systems.

• Assist users in accessing and using IT systems.

• Provide Tier 1 Help Desk and Tier 2 escalation support for problem identification, diagnosis, and resolution.

• Support dispatch-system and hardware problems and remain engaged through resolution.

• Provide detailed analysis and feedback to agency management and internal customers for escalated tickets.

• Communicate system status, technical issues, and resolution progress to agency management and internal customers.

This posting is for multiple opportunities

Required Qualifications

Clearance

• TS/SCI with Polygraph at the time of Application, to be considered for the position.

Education & Experience

• Ten (10) years of System Administration experience supporting programs and contracts of similar scope, type, and complexity.

• Bachelor's degree in a technical discipline from an accredited college or university.

• Five (5) additional years of System Administration experience may be substituted for the bachelor's degree.

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 28, 2026

Pay Range:

Pay Range $92,300.00 - $166,850.00

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.