System Administrator

Leidos; Chantilly (NC); On-site; USD 120,000 - 185,000; Full time

Job summary

Leidos is seeking an experienced System Administrator to support mission-focused programs at the Liberty Center in Chantilly, VA. You will design, implement, and maintain Windows Server and workstation environments, while ensuring security, reliability, and performance across interconnected WAN/LAN networks.

The role requires active Top Secret/SI clearance with polygraph compatibility and DoD 8570 I/II certifications, plus hands-on experience with AD, DNS, Exchange, and enterprise patch

Qualifications

• Bachelor’s degree with 8–12 years of relevant information technology experience.
• United States citizenship.
• Top Secret/Sensitive Compartmented Information clearance with willingness to complete and maintain a polygraph.
• Current DoD 8570 IAMS and/or IAT Level II compliant certification.
• System administration experience in Windows desktop and server environments.
• Experience with Windows 10/11, Server 2016/2019+ environments.
• Experience with Active Directory, DNS, and Exchange Server.
• Experience maintaining workstation, server, and printer hardware.
• Experience with enterprise patch-management and vulnerability remediation.
• Ability to configure Windows systems in a network domain environment.
• Strong troubleshooting, analytical, and communication skills.
• Excellent documentation and presentation abilities.
• Strong customer-service and interpersonal skills.
• Ability to work independently and as part of a technical team.

Responsibilities

• Support mission programs and projects at the Chantilly facility.
• Design, plan, implement, configure, administer, and maintain Windows Server/workstation environments.
• Configure and deploy Windows servers/workstations and client software in domain environments.
• Maintain LANs and support WAN interconnectivity.
• Act as subject-matter expert for OS, applications, and infrastructure.
• Evaluate requirements and draft technical specifications and implementation plans.
• Recommend redesigns and configuration changes to improve performance.
• Maintain availability, reliability, security, and performance of systems.
• Perform OS patching, security configuration, and remediation for Windows endpoints.
• Remediate vulnerabilities with cybersecurity personnel.
• Maintain compliance with government security standards with ISSM.
• Support Active Directory, DNS, Exchange, and MFA services.
• Manage and maintain AD forests; hardware for workstations/servers/storage/printers.
• Support enterprise backups, DR, and high-availability solutions.
• Assist with storage technologies such as NetApp or Dell EMC.
• Troubleshoot complex hardware/software/network issues.
• Integrate acquired or merged systems into existing environments.
• Document configurations, procedures, risks, and status.
• Provide status updates to leadership and stakeholders.
• Provide technical leadership for admin initiatives.
• Deliver responsive support to internal/external customers.
• Participate in training to stay current with new technologies.

Skills

Windows administration

Troubleshooting

Documentation

Customer service

Independent working

Education

Bachelor's degree in IT

Tools

Active Directory

DNS

Microsoft Exchange

NetApp

Dell EMC

Patch management

Job description

Leidos’ Corporate Information Security Office, within the Digital Sector, is seeking an experienced System Administrator to support multiple mission-focused programs and projects at the Liberty Center location in Chantilly, Virginia.

In this role, you will provide technical analysis, planning, engineering, design, implementation, and operational support for Microsoft Windows Server and workstation environments. This position will play an integral role in modernizing interconnected wide area networks, implementing evolving customer requirements, and integrating acquired or merged systems and assets.

You will serve as a technical expert for complex operating systems and enterprise applications. Responsibilities include evaluating system requirements, developing technical specifications, recommending system redesigns and configuration changes, resolving complex technical issues, and providing project leadership to maintain a high level of service for internal and external customers.

Location

All work will be performed on-site in Chantilly, VA.

Clearance: You must currently hold active Top Secret/SCI clearance and be eligible to obtain Polygraph.

Primary Responsibilities

• Support multiple mission programs and projects located at the Chantilly facility.
• Design, plan, implement, configure, administer, and maintain Microsoft Windows Server and workstation environments.
• Configure and deploy Windows servers, Windows workstations, and client software within network domain environments.
• Maintain and configure local area networks and provide support for interconnected WAN environments.
• Serve as a technical subject-matter expert for complex operating systems, system applications, and enterprise infrastructure.
• Evaluate system requirements and determine the technical feasibility of proposed solutions.
• Develop system specifications, implementation plans, and technical recommendations.
• Recommend redesign, configuration, and performance improvements for operating systems and applications.
• Maintain the availability, reliability, security, and performance of supported systems.
• Perform operating system patching, security configuration, and remediation activities to ensure Windows endpoints remain secure and current.
• Review and remediate vulnerability findings in coordination with cybersecurity personnel.
• Collaborate with the Information System Security Manager to maintain system compliance with applicable government security standards.
• Support Active Directory, Domain Name System, Microsoft Exchange, and multifactor authentication services.
• Administer environments containing multiple Active Directory forests.
• Manage and maintain workstation, server, storage, and printer hardware.
• Support enterprise backup, disaster recovery, and high-availability capabilities.
• Support enterprise storage solutions, including NetApp or Dell EMC technologies.
• Troubleshoot complex hardware, software, operating system, network, and application issues.
• Integrate newly acquired or merged systems and assets into existing enterprise environments.
• Document system configurations, technical procedures, risks, issues, and operational status.
• Provide timely status updates to program leadership, customers, cybersecurity personnel, and other stakeholders.
• Provide technical and project leadership for system administration initiatives.
• Deliver responsive, professional support to internal and external customers.
• Participate in technical training and hands-on learning to develop proficiency with new technologies.

Required Qualifications

• Bachelor’s degree with 8–12 years of relevant information technology experience. Additional relevant experience, training, or certifications may be considered in lieu of a degree.
• United States citizenship.
• Must hold current and active Top Secret/Sensitive Compartmented Information clearance with willingness and ability to successfully complete and maintain a polygraph.
• Current DoD 8570 IAM Level I and/or IAT Level II compliant certification, as required for the position.
• System administration experience in Microsoft Windows desktop and server operating system environments.
• Experience administering Windows 10, Windows 11, Windows Server 2016, and Windows Server 2019 +.
• Experience with Windows Server administration and a demonstrated desire to develop deeper Windows engineering expertise.
• Experience with Active Directory, DNS, and Microsoft Exchange Server.
• Experience managing and maintaining workstation, server, and printer hardware.
• Experience with enterprise patch-management solutions.
• Experience patching systems and remediating vulnerability findings.
• Ability to configure and support Windows systems in a network domain environment.
• Strong troubleshooting, analytical, and problem-solving skills.
• Strong written and verbal communication skills.
• Effective technical documentation and presentation skills.
• Strong customer-service and interpersonal skills.
• Ability to work independently and collaboratively as part of a technical team.

Preferred Qualifications

• Experience supporting multiple Active Directory forests.
• Experience administering Microsoft Exchange environments.
• Experience with enterprise storage technologies such as NetApp or Dell EMC.
• Experience implementing or supporting multifactor authentication.
• Experience managing backup, disaster recovery, and high-availability solutions.
• Previous on-site support experience within a government IT environment.
• Experience integrating acquired, merged, or newly introduced systems into an established enterprise environment.
• Experience supporting classified systems or mission-critical government programs.
• Experience providing technical leadership for infrastructure modernization projects.

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 8, 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 $107,900.00 - $195,050.00

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.