Windows Systems Administrator - McLean, VA - TS/SCI

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 Apply for this job