Windows Systems Administrator - TS/SCI with CI Poly

Company: PGTEK
Location: Mc Lean
Posted on: February 19, 2026

Job Description:

Job Description Job Description Windows Systems Administrator Location: McLean, VA (100% Onsite) Clearance Required: Active TS/SCI with CI Polygraph Summary We are seeking an experienced and skilled Windows Systems Administrator to join our IT infrastructure team supporting a mission-critical federal environment. In this role, you will be responsible for the design, implementation, maintenance, and support of Windows-based systems, networks, and applications. This is an excellent opportunity for a detail-oriented professional who is passionate about system reliability, security, and delivering high-quality technical support in a classified environment. Key Responsibilities Design, implement, maintain, and support Windows-based server and desktop environments Administer and support Active Directory, Group Policy, DNS, and related core services Deploy and manage Windows systems using enterprise deployment tools (e.g., SCCM, MDT) Monitor system performance, troubleshoot issues, and optimize system resources Provide technical support to end users via phone, email, and in-person support Administer and support enterprise email systems, including Microsoft Exchange and Outlook Perform backup, recovery, and disaster recovery operations Develop, maintain, and update system administration documentation and procedures Collaborate with other IT teams to ensure successful integration of new technologies Apply operating system updates, security patches, and best practices Travel up to 20% as required for on-site installations, maintenance, and troubleshooting at customer sites or data centers Requirements Minimum of 3 years of experience as a Windows Systems Administrator or in a similar role Strong knowledge of Windows Server and Windows Desktop operating systems Hands-on experience with Active Directory, Group Policy, and DNS Experience with Windows deployment and configuration tools (SCCM, MDT) Understanding of backup and disaster recovery concepts and procedures Strong troubleshooting and problem-solving skills Excellent verbal and written communication skills Ability to work independently and as part of a team in a secure, fast-paced environment Certifications Required Active TS/SCI clearance with CI Polygraph (must be a current active clearance) Preferred / Beneficial Skills Experience installing, configuring, and supporting Linux (Server and/or Workstation) Scripting and automation experience with PowerShell, Python, and/or Bash Microsoft certifications such as MCSA, MCSE , or equivalent industry certifications Knowledge of security best practices, including firewalls, antivirus, and endpoint protection Experience with virtualization technologies (VMware, Hyper-V, KVM) SQL Server administration experience Familiarity with IT service management tools and frameworks (e.g., ServiceNow) Benefits Salary: 130-160K 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

Keywords: PGTEK, Potomac , Windows Systems Administrator - TS/SCI with CI Poly, IT / Software / Systems , Mc Lean, Maryland