SAIC is currently seeking a motivated and experienced System Administrator to join our team at the Pentagon in Arlington, VA. Shift Schedule: Monday–Friday, 6:00 AM to 6:00 PM core hours with occasional after‑hours onsite work to support a NIPR and SIPR environment. Responsibilities: • Manage currently supported and subsequent Windows Server Operating Systems on virtual operating environments, providing technical oversight and consultation services. • Perform complex system administration and security engineering efforts, STIG remediation, advanced GPO implementation and system upgrades. • Research and resolve performance, capacity, and other server‑related issues. • Provide mentorship and guidance to junior systems administrators and other IT staff. • Improve efficiencies by documenting and standardizing support processes while capturing and developing best practices. • Provide support for the escalation and communication of statuses to leadership to include the government customer. • Maintain and update Server STIG (Security Technical Implementation Guide) requirements to comply with DISA standards. • Ability to remain flexible and adapt to changing priorities with efficiency. • Adhere to change management guidelines by writing Change Requests and seeking the necessary approvals. • Support operational transition of enterprise solutions into production. Required Qualifications: • Bachelors and two (2) years or more experience or Masters and 0 years related experience. • Active DoD Top Secret clearance. • Active DoD 8570.01‑M/8140 IAT Level II certification (e.g., Security+ CE, CySA+, etc.) is required prior to start • Expert-level knowledge of Microsoft Windows Server, Active Directory Domain Services (AD DS), Domain Name System (DNS), and Group Policy (GP) management. • Experience implementing and managing Active Directory Certificate Services (AD CS) to support a large-scale Public Key Infrastructure (PKI). • Strong understanding of authentication mechanisms (Kerberos, LDAP, NTLM) and experience with advanced troubleshooting. • Experience implementing Public Key Infrastructure (PKI) with Active Directory. • Knowledge of Security Assertion Markup Language (SAML). • Excellent analytical skills and a proven track record in developing and implementing innovative solutions to complex problems. • Experience working in a multi-tenant or large enterprise server environment. • Skilled in scripting and automation using PowerShell to improve and standardize system management.