Senior Windows System Administrator; TS​/SCI Clearance Scope Polygraph

Senior Windows System Administrator (TS/SCI Clearance With Full Scope Polygraph Required)

Annapolis, United States | Posted on 09/02/2026

Position: Senior Windows System Administrator

Location: Annapolis Junction, MD

Position Type: Full-Time

Security Clearance: TS/SCI with Polygraph

Compensation: $188,000 – $210,000

We are seeking an experienced Senior Windows System Administrator to join a high-performing Agile team operating within the Scaled Agile Framework (SAFe) in support of a complex, fast-paced program. In this role, you will deliver daily systems administration and operations & maintenance (O&M) support across geographically dispersed systems. Key responsibilities include responding to systems engineering requests that fulfill operational needs, as well as engineering, deploying, and sustaining capabilities across virtualized Windows infrastructure.

• Maintain multiple virtual server clusters, resolve system scan findings, implement vulnerability management patching, and handle Active Directory configuration issues.
• Utilize enterprise monitoring tools to detect, assess, and remediate alerts and outages.
• Provide technical support and collaborate cross-functionally with partner work groups on overlapping engineering initiatives.
• Manage Information Assurance Vulnerability Alerts (IAVAs) and system security scans in alignment with System Security Plans (SSPs), ensuring timely vulnerability remediation.
• Execute monthly security scans, implement remediation measures, and deploy security patches/updates to designated environments.
• Diagnose, troubleshoot, and resolve hardware and software system failures.
• Communicate system outages, publish maintenance status updates, and proactively alert stakeholders to infrastructure delays that may impact operational functions.
• Author and maintain comprehensive, precise technical documentation and standard operating procedures (SOPs).
• Plan and execute IT modernization enhancements while supporting program project milestones.
• Support operations and maintenance troubleshooting on an on-call rotation as required.

• Clearance: Active TS/SCI security clearance with a current polygraph.
• Experience: Minimum 7 years of dedicated Windows systems administration experience.
• Security & Governance: Minimum 7 years of experience in information security management, demonstrating knowledge of security governance, risk management, compliance, and operational security functions.
• Core Technical Competencies (5+ years of hands-on experience with each):
  • Implementing and administering Windows Active Directory (AD) and DNS environments.
  • Designing, configuring, and managing Group Policy Objects (GPOs).
  • Microsoft Exchange administration, including Exchange Management Shell.
• Scripting & CLI: Hands-on proficiency with Windows Command Line, Power Shell, and automated Power Shell scripting.
• Vulnerability Management: Direct experience with IAVA management and vulnerability remediation processes.
• Systems Familiarity: Working knowledge of Windows and Linux operating systems, VMware virtualization, and core enterprise networking concepts (switches, routers, LANs, and cabling infrastructure).
• Demonstrated commitment to change management protocols, maintenance windows, and ITIL best practices.

• Bachelor's degree in Computer Science, Information Technology, or a related technical discipline with 12+ years of relevant experience.
• Experience documenting and supporting security accreditation and authorization (A&A / RMF) processes.
• Familiarity with network security technologies, including multi-domain architectures, Public Key Infrastructure (PKI), SSPs, and vulnerability scanning tools.
• Experience with enterprise data center deployment, including rack-and-stack, power planning, and hardware placement.
• Direct experience administering VMware vSphere environments.
• Experience with configuration automation frameworks such as Ansible or Salt Stack.
• Prior background serving as a System Administrator supporting software configuration management and development pipelines.