Senior System Administator - TS​/SCI Clearance

The Senior System Administrator will support the administration, maintenance, security, and optimization of mission-critical Windows-based infrastructure in a secure federal environment. This role requires an experienced administrator with strong technical troubleshooting skills, a proactive approach to system performance and reliability, and the ability to operate effectively in environments requiring an active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance.

Administer, maintain, and troubleshoot Windows Server and Windows desktop environments across classified or secure enterprise networks. Manage Active Directory, Group Policy Objects, DNS, DHCP, user accounts, security groups, organizational units, and domain controller operations. Perform system monitoring, performance tuning, capacity planning, patch management, vulnerability remediation, and root cause analysis. Install, configure, upgrade, and support operating systems, enterprise applications, server hardware, and virtualized infrastructure.

Develop, maintain, and execute standard operating procedures for system builds, configuration baselines, software deployments, and maintenance activities. Support compliance with applicable security standards, including DISA STIGs, vulnerability scan remediation, change control, and configuration management requirements. Provide Tier II/III support for escalated incidents involving servers, workstations, applications, authentication, permissions, and enterprise services. Use Power Shell or other scripting tools to automate routine administration, reporting, software deployment, and maintenance tasks.

Coordinate with cybersecurity, network, engineering, and help desk teams to support secure and reliable system operations. Mentor junior administrators and provide technical guidance on troubleshooting, documentation, and operational best practices.

Active TS/SCI clearance is required at the time of hire. U.S. citizenship is required due to federal contract and clearance requirements. 8+ years of relevant experience in systems administration, infrastructure operations, or enterprise IT support. Strong hands‑on experience administering Microsoft Windows Server and Windows workstation environments. Experience with Active Directory, Group Policy, DNS, DHCP, domain services, user permissions, and enterprise authentication.

Experience with patching, vulnerability remediation, system hardening, and applying secure configuration baselines. Ability to troubleshoot complex hardware, software, operating system, authentication, and network‑related issues. Experience supporting secure or classified environments, including adherence to change management and documentation requirements. Strong written and verbal communication skills, with the ability to document procedures and brief technical status to stakeholders. DoD 8570/8140 IAT Level II certification, such as Security+ CE, or the ability to obtain/maintain required compliance certification, is a plus.

Experience with VMware, Hyper‑V, Nutanix, or other enterprise virtualization platforms, is a plus. Experience with Microsoft Endpoint Configuration Manager, SCCM, MECM, PDQ Deploy, or similar software deployment tools, is a plus. Familiarity with ACAS/Nessus vulnerability findings, HBSS/ESS tools, STIG Viewer, and remediation tracking, is a plus. Experience creating or maintaining Windows images, deployment packages, and automated build processes, is a plus.

Working knowledge of backup and recovery processes, disaster recovery planning, and continuity of operations support, is a plus. Experience supporting IIS, file services, print services, certificate services, or other Microsoft enterprise services, is a plus.

Pay range: $175,000 - $220,000 depending on experience and skill set. Benefits overview:  Salary ranges may be subject to geographic differentials CDW is committed to being an AI‑fluent organization.

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