Senior Windows Systems Administrator — TS/SCI

CDW; Florida; On-site; USD 175,000 - 220,000; Full time

Job summary

CDW is seeking a Senior System Administrator to support Windows-based infrastructure in a secure federal environment. The role requires TS/SCI clearance, US citizenship, and 8+ years of experience in systems administration.

You will manage AD, DNS, DHCP, GPOs, patching, and vulnerability remediation, while coordinating with cybersecurity, network, and help desk teams. Strong scripting and automation are essential.

Qualifications

• Active TS/SCI clearance required.
• U.S. citizenship required due to federal contract.
• 8+ years of systems administration experience.
• Strong experience with Windows Server & Windows desktops.
• Experience with Active Directory, DNS, DHCP, GPO, and enterprise authentication.
• Experience patching, vulnerability remediation, and secure baselines.
• Troubleshoot complex hardware, software, and network issues.
• Experience in secure/classified environments and change control.
• Excellent written and verbal communication; brief technical status to stakeholders.
• DoD 8570/8140 IAT II certification a plus.
• Virtualization and software deployment tools are a plus.
• Familiarity with vulnerability scanners and STIGs is a plus.

Responsibilities

• Administer Windows Server and desktop environments in secure networks.
• Manage AD, DNS, DHCP, GPOs, user accounts, domains, and domain controllers.
• Perform monitoring, tuning, patching, and vulnerability remediation.
• Install and support operating systems, apps, server hardware, and virtualization.
• Develop and maintain standard operating procedures for builds and deployments.
• Ensure compliance with DISA STIGs, change control, and CM requirements.
• Provide Tier II/III support for escalated incidents.
• Use PowerShell to automate admin tasks and reporting.
• Collaborate with cybersecurity, network, and help desk teams.
• Mentor junior admins and share troubleshooting best practices.

Skills

TS/SCI clearance

Windows administration

PowerShell scripting

Troubleshooting

Communication

Mentoring

Problem solving

DoD environment experience

Tools

VMware

Hyper-V

Nutanix

SCCM / MECM / PDQ Deploy

ACAS / Nessus / STIG tools

Job description

CDW is seeking a Senior System Administrator to support Windows-based infrastructure in a secure federal environment. The role requires TS/SCI clearance, US citizenship, and 8+ years of experience in systems administration.

You will manage AD, DNS, DHCP, GPOs, patching, and vulnerability remediation, while coordinating with cybersecurity, network, and help desk teams. Strong scripting and automation are essential.