Windows Systems Administrator Team Lead

The One 23 Group; Arlington (VA); On-site; USD 90,000 - 120,000; Full time

Job summary

The One 23 Group is seeking a Windows Systems Administrator – Team Lead in Arlington, Virginia. In this hands-on role, you will provide systems engineering and administration support for mission-critical systems in a classified DoD environment. Responsibilities include overseeing system administrators, providing Tier 3 support, and maintaining enterprise Windows infrastructure.

The ideal candidate has a minimum of 10 years of experience, an active Top Secret Clearance, and relevant IT certifications. Join us at The One 23 Group to help shape innovative solutions.

Qualifications

• Minimum active Top Secret Clearance with SCI eligibility.
• 10 years of relevant IT systems engineering or systems administration experience.
• DoD 8140/8570 Information Assurance Technical Level II (IAT-II) certification.

Responsibilities

• Oversee technical activities of assigned system administrators.
• Provide Tier 3 support for in-house systems.
• Maintain Windows server operating systems at required versions.
• Administer Active Directory architecture and VDI environments.

Skills

Windows Server Administration

Active Directory Management

PowerShell Scripting

Network Configuration

VMware Management

Job description

At The One 23 Group, our mission is to set the benchmark for excellence in government services. We empower our clients in the Department of War, Intelligence Community, and Federal Civilian sectors to excel with our advanced capabilities. Our dedication lies in fostering a people‑first culture, underpinned by steadfast ethical principles. Embracing innovative technologies and process improvements, we are steadfast in our journey toward a future that is both bright and transformative.

Our expertise spans Enterprise IT, Mission IT and Cyber. With our global footprint, we place a strong emphasis on nurturing our people and culture, which forms the core of our successful strategies in leadership and financial management. We pride ourselves on our extensive experience and effective approach, ensuring that we lead with both innovation and integrity.

The Position

We are seeking a Windows Systems Administrator – Team Lead to provide systems engineering and administration support for mission‑critical, contract‑owned systems operating in a classified DoD environment. This role delivers Tier 2 and Tier 3 support, oversees lifecycle maintenance of Windows‑based infrastructure, and leads a team of system administrators in daily operations and engineering activities.

This is a hands‑on technical leadership role supporting secure, enterprise‑level Windows server and network environments.

Responsibilities

• Oversee and coordinate technical activities of assigned system administrators, providing leadership on enterprise Windows infrastructure operations.
• Provide Tier 3 support for in‑house developed systems and site‑unique enhancements.
• Maintain Windows server operating systems at Government‑required versions.
• Maintain COTS, GOTS, and Open‑Source software at required versions.
• Install, configure, test, administer, and troubleshoot server and client software upgrades.
• Develop engineering assessments of system configurations and recommend improvements.
• Support network monitoring activities and firewall configuration as required.
• Administer Active Directory architecture, DNS, DHCP, and Virtual Desktop Infrastructure (VDI) environments.
• Manage VMware environments including vSphere, ESXi, and vCenter.
• Support SAN storage, enterprise backup and recovery solutions, and automation through PowerShell scripting.
• Participate in change and configuration control processes to ensure compliance within classified DoD environments.

Additional Information

• Position located on‑site

Requirements

• Minimum active Top Secret Clearance with SCI eligibility.
• DoD 8140/8570 Information Assurance Technical Level II (IAT-II) certification.
• 10 years of relevant IT systems engineering or systems administration experience supporting enterprise Windows environments.

Preferred

• Experience supporting systems within classified DoD enterprise environments.
• Experience with Virtual Desktop Infrastructure (VDI).
• PowerShell scripting and automation experience.