Windows Systems Administrator - McLean, VA - TS/SCI

PGTEK; McLean (VA); On-site; USD 185,000 - 265,000; Full time

Benefits offered by this job

PPO medical with HSA

Vision & Dental

Life Insurance

Disability Insurance

401(k) matching

Education Assistance after 12 months

Employee Assistance Program

Pet insurance discount

Job summary

PGTEK is seeking a Senior System Administrator to maintain Windows-based infrastructure, including AD, DNS, group policy, and enterprise email, in support of next‑generation tech initiatives in the VA corridor.

You will design, deploy, patch, monitor, and troubleshoot Windows systems, provide Tier II/III support, and collaborate across IT teams. TS/SCI clearance required; up to 20% travel.

Qualifications

• Active TS/SCI clearance with CI Polygraph is required.
• 8+ years experience as Windows System Administrator or similar role.
• Deep expertise in Windows Server and Desktop operating systems.
• Hands-on with Active Directory, Group Policy, DNS, and patch management.
• Excellent communication and interpersonal skills; DoD 8570 IAT Level II.
• Experience with enterprise infrastructure design and support.

Responsibilities

• Design, implement, and maintain Windows-based systems, networks, and apps.
• Architect and support enterprise Windows infrastructure.
• Administer AD, Group Policy, DNS, and patch management.
• Monitor, troubleshoot, and ensure high availability of systems.
• Provide Tier II/III support via phone, email, and in‑person.
• Deploy system updates using SCCM/MDT and document SOPs.
• Collaborate with IT teams to integrate new technologies.

Skills

Windows Server

Active Directory

Group Policy

DNS

Exchange

Patching & updates

SCCM/MDT

Troubleshooting

IAM DoD 8570 IAT

Tools

VMware

Hyper-V

KVM

ServiceNow

SCCM/MDT

Job description

Senior System Administrator (Windows)

Location: McLean, VA (transitioning to Chantilly, VA)

Clearance Required: Active TS/SCI with CI Polygraph

Salary Range: $185,000 – $265,000

Travel: Up to 20%

Overview

We are seeking a highly skilled Senior System Administrator to join a dynamic infrastructure team supporting next‑generation technologies, including initiatives in the Artificial Intelligence (AI) space. This role is ideal for a hands‑on technical expert who thrives in complex environments and is passionate about building, maintaining, and optimizing enterprise systems.

Key Responsibilities

• Design, implement, and maintain Windows‑based systems, networks, and applications
• Architect and support enterprise‑level Windows infrastructure
• Administer and manage:
• Active Directory
• Group Policy
• DNS
• File servers
• Exchange / enterprise email systems
• Manage patching, updates, and system performance optimization
• Monitor systems, troubleshoot issues, and ensure high availability
• Support system deployments using tools such as SCCM or MDT
• Develop and maintain technical documentation and standard operating procedures
• Provide Tier II/III technical support via phone, email, and in‑person
• Collaborate with cross‑functional IT teams to integrate new technologies
• Travel up to 20% for on‑site support, installations, and maintenance

Requirements

• MUST have a current and active TS/SCI clearance with CI Poly
• 8+ years of experience as a Windows System Administrator or similar role
• Deep expertise in Windows Server and Desktop operating systems
• Strong experience with enterprise infrastructure design and support
• Hands‑on experience with Active Directory, Group Policy, DNS, and patch management
• Proven ability to troubleshoot and resolve complex technical issues
• Excellent communication and interpersonal skills
• IAM Level II certification (DoD 8570 IAT compliant)

Preferred Qualifications

• Experience with Linux (server or workstation environments)
• Scripting and automation skills (PowerShell, Python, Bash)
• Microsoft certifications (MCSA, MCSE) or equivalent
• Experience with virtualization technologies (VMware, Hyper‑V, KVM)
• Knowledge of backup and disaster recovery strategies
• Familiarity with security best practices (firewalls, antivirus, etc.)
• SQL Server administration experience
• Experience with ITSM platforms such as ServiceNow

Core Competencies

• Problem‑Solving: Strong analytical skills with the ability to resolve complex system issues
• Communication: Clear and effective communicator across technical and non‑technical teams
• Collaboration: Team‑oriented with the ability to work across multiple stakeholders
• Mentorship: Ability to guide junior engineers and promote best practices
• Ownership: Proactive mindset with strong accountability for system performance and reliability

Benefits

Our comprehensive benefits package for full‑time salaried employees is effective immediately upon the start date. Benefits include comprehensive PPO medical coverage with access to a Health Savings Account (HSA) option, a vision plan, and dental insurance with the base dental plan option paid for by PGTEK. Life Insurance, Short and Long‑Term disability, and Critical Illness insurance have premiums covered. Additionally, PGTEK offers a matching 401(k) plan and a discount on pet insurance through ASPCA Pet Insurance. An Employee Assistance Program is available at no cost to all employees. PGTEK offers a generous amount of PTO and Holidays, and an Education Assistance Program is available after 12 months of employment.

About Pgtek

PGTEK is a true consulting organization dedicated to helping clients achieve their business and technology objectives utilizing our decades of experience and business relationships. PGTEK invests in the educational advancements of our staff by providing the necessary resources to complete Professional and Business Certifications. Our company is our people, and we treat them like family.

EOE, including disability/veterans