Senior Windows Systems Administrator

The Leidos Digital Modernization Sector is seeking a Senior Windows Systems Administrator in support of the Air Force National Capital (AFNCR) IT Services program.

This position is located at The Pentagon, Arlington VA.

At Leidos, we deliver innovative solutions through the efforts of our diverse and talented people who are dedicated to our customer's success. We empower our teams, contribute to our communities, and operate sustainably. Everything we do is built on a commitment to do the right thing for our customers, our people, and our community. Our Mission, Vision, and Values guide the way we do business.

Primary Responsibilities:

• Manage our Windows infrastructure to include installation, configuration, patching, and upgrades, with a strong emphasis on utilizing PowerShell and/or Windows tools to continuously review and streamline these processes.
• Support all aspects of our Windows Active Directory infrastructure (Unclassified & Classified), Windows DNS, DHCP, Veritas replicated file shares management & Windows DFS Shares.
• Implement and maintain robust system hardening techniques using security compliance tools such as Evaluate STIG, SCAP, STIG Viewer.
• Troubleshoot and resolve complex system issues, perform root cause analysis and implement effective solutions, often leveraging your scripting skills in PowerShell to automate repetitive tasks and improve efficiency.
• Develop and maintain these scripts/tools to manage system administration, monitoring, and deployment workflows.
• Interface with vendors to ensure appropriate resolution during system outages or periods of reduced performance.
• Manage O&M activities to include plan and schedule preventive maintenance, and brief Change Review Board (CRB) as required for major changes to the production environment.
• Perform software installations and upgrades to operating systems and layered software packages.
• Provide guidance to less experienced personnel on workstation/server data integrity matters and the implementation of standard software and hardware solutions.
• Support special projects and day-to-day operations as needed or assigned.
• Support on-call rotation schedule.

Basic Qualifications:

• Bachelor's degree in information systems, computer science, information security or related field and 8+ years of prior relevant work experience or a Masters with 6+ years of prior relevant experience, additional years of experience will be accepted in lieu of a degree.
• 6+ years of Senior level experience in Windows server (Server OS 2019, 2022) and Windows 10/11 administration.
• Requires an current 8140 IAT Level II (Intermediate or Advanced) certificate (CompTIA Security+ or Systems Security Certified Practitioner (SSCP) ) Training (DISA-US1390 DCWF Windows Systems Administrator).
• Expert knowledge of Windows Active Directory infrastructure (GPOs, Group and User management).
• Expert knowledge of Windows DNS & DHCP.
• Expert on DoD patch Management and Vulnerability Remediation (Process and Tools).
• Experience with various client hardware including HP and Dell laptops, desktops, and associated peripherals.
• Expert experience with PowerShell scripting and remote management of workstations and servers.
• Strong knowledge of debugging tools and processes for diagnosing system issues.
• Knowledge of Veritas replicated file shares management and Windows DFS.
• Experience in managing or working with cross-functional teams to deliver projects.
• Experience with VMware and Hyper-V hypervisor.
• Understanding of cybersecurity principles and best practices.
• Knowledge of security tools and technologies to protect systems from vulnerabilities.
• Familiarity with network protocols (TCP/IP, HTTP, DNS, etc.) and networking equipment (routers, switches, firewalls).

Preferred Qualifications:

• Experienced working at the Pentagon, Joint Base Andrews (JBA), and Joint Base Anacostia-Bolling (JBAB)
• Knowledge of Air Force, Pentagon, and/or AFNCR.
• Ability to work effectively with diverse teams (software developers, hardware engineers, network specialists, etc.)
• Experience with current branch MS Endpoint Management platform in a distributed environment.
• Knowledge and experience in working with the Microsoft System Center Configuration Manager (SCCM) /Microsoft Endpoint Configuration Manager (MECM).

At Leidos, we don't want someone who "fits the mold"-we want someone who melts it down and builds something better. This is a role for the restless, the over-caffeinated, the ones who ask, "what's next?" before the dust settles on "what's now."

If you're already scheming step 20 while everyone else is still debating step 2... good. You'll fit right in.

Original Posting:
January 6, 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 $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.