Windows System Administrator

Leidos; Suitland (MD); On-site; USD 92,000 - 167,000; Full time

Job summary

Leidos in Suitland, MD seeks an experienced Windows System Administrator to support enterprise Windows environments, system upgrades, vulnerability management, and secure configuration in a mission‑critical setting.

Responsibilities include building/upgrading Windows servers, running ACAS scans, managing GPO/AD, SCCM deployments, imaging and compliance, patching, STIG hardening, and basic SQL Server configuration. A TS/SCI clearance and DoD 8570 IAT certification are required.

Qualifications

• Bachelor’s degree with 8+ years of experience or a Master’s degree with 6+ years of experience.
• Active TS/SCI in DISS and required program access.
• Active DoD 8570/8140 IAT II or III certification (Security+, CASP, CISSP, etc.).
• Windows system administration in enterprise environments.
• ACAS scanning and vulnerability remediation.
• SCCM deployment and compliance reporting.
• Patch management and STIG implementation.
• GPO management and AD administration.
• Strong troubleshooting and communication skills.

Responsibilities

• Build and upgrade Windows servers and workstations.
• Run and analyze ACAS vulnerability scans.
• Manage GPOs, Active Directory, and domain services.
• Support SCCM deployments, imaging, and compliance.
• Perform system patching and STIG hardening.
• Provide basic SQL Server configuration and troubleshooting.
• Maintain system documentation and support RMF/A&A activities.

Skills

Windows system administration

Troubleshooting

Communication skills

Security/compliance

Education

Bachelor’s degree in a related field

Master’s degree in a related field

Tools

ACAS

SCCM

GPO/AD

SQL Server configuration

STIG Viewer

eMASS

RMF/A&A

PowerShell scripting

Job description

Windows System Administrator
Location: Suitland, MD

Clearance: TS/SCI

We are seeking an experienced Windows System Administrator in Suitland, MD to support enterprise Windows environments, system upgrades, vulnerability management, and secure configuration in a mission‑critical setting.

Key Responsibilities:

• Build and upgrade Windows servers and workstations.
• Run and analyze ACAS vulnerability scans.
• Manage GPOs, Active Directory, and domain services.
• Support SCCM deployments, imaging, and compliance.
• Perform system patching and STIG hardening.
• Provide basic SQL Server configuration and troubleshooting.
• Maintain system documentation and support RMF/A&A activities.

Basic Qualifications:

• 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.
• Active TS/SCI in DISS and required program access.
• Active DoD 8570/8140 IAT II or III certification (Security+, CASP, CISSP, etc.).
• Windows system administration in enterprise environments.
• ACAS scanning and vulnerability remediation.
• SCCM deployment and compliance reporting.
• Patch management and STIG implementation.
• GPO management and AD administration.
• Strong troubleshooting and communication skills.

Preferred Qualifications:

• NetApp storage management experience.
• VMware experience.
• PowerShell scripting.
• Familiarity with RMF, STIG Viewer, and eMASS.

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:

October 16, 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 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.