Windows Systems Administrator - TS/SCI with Polygraph

WINDOWS SYSTEMS ADMINISTRATOR

YOUR IMPACT

Own your opportunity to support national defense. Your work will help keep critical operations secure and connected across the global enterprise directly, contributing to a mission that protects our nation every day.

CIO Infrastructure Services (CIS) is growing, and we invite both our experienced incumbents and new team members to be part of what’s next. Incumbents bring invaluable mission insight, while new talent adds fresh ideas and energy. Together, we’ll strengthen continuity and drive the next generation of innovation.

MEANINGFUL WORK AND PERSONAL IMPACT

As a Windows Systems Administrator supporting enterprise infrastructure services, you will operate, secure, and sustain Windows server and client platforms across dynamic multinetwork environments. You will ensure stable operations, maintain compliance with security and configuration standards, and support mission critical services that require high availability and rapid issue resolution. Your contributions directly improve system reliability, resilience, and readiness across globally distributed environments.

KEY RESPONSIBILITIES:

• Administer, operate, and maintain Windows server and endpoint systems across physical, virtual, and cloud environments, ensuring stability, performance, and secure configurations
• Perform Tier II/III troubleshooting and root cause analysis for OS level, authentication, GPO, networking, and dependency related issues supporting enterprise services
• Manage configuration baselines, apply required updates, support lifecycle planning, and maintain accurate documentation for change, configuration, and operational processes
• Support Active Directory, Group Policy, certificate services, server roles, and related identity, access, and configuration services across multiple network domains
• Maintain, monitor, and update Windows systems for compliance with security baselines, STIG settings, and enterprise hardening requirements
• Coordinate with engineering, cybersecurity, monitoring, and platform teams to ensure secure integrations, dependency mapping, and seamless operations
• Maintain server virtualization environments, including building, updating, and troubleshooting virtual machines, templates, hypervisors, and supporting infrastructure
• Support operational tasks such as firmware updates, system provisioning, backup/restore activities, template updates, and service availability monitoring
• Execute Windows OS and security patching across assigned systems, deploying enterprise approved updates, baseline releases, and third-party patches to maintain security and configuration compliance
• Identify and remediate noncompliant systems by reviewing vulnerability and SCAP reports, diagnosing root causes, coordinating corrective actions, and validating remediation across multiple networks

WHAT YOU’LL NEED TO SUCCEED:

• EDUCATION: Bachelor’s degree in an IT-related field, or 10+ years of relevant IT experience in lieu of a degree
• CERTFICATION: Meet DoD 8140 Information Assurance Workforce certification requirements (e.g. Security+ CE, etc.)
• CLEARANCE: Active TS/SCI clearance with a favorable polygraph
• Hands on experience administering Windows Server and Windows client OS in enterprise or multinetwork environments
• Proficiency with Active Directory, GPO creation/troubleshooting, OS deployment tooling, and PowerShell automation
• Experience implementing secure configurations, STIG/HBSS compliance, and OS hardening practices
• Familiarity with enterprise patch management, vulnerability remediation, and configuration compliance auditing
• Ability to diagnose and resolve complex OS, authentication, and configuration issues across distributed infrastructure
• Strong documentation, communication, and collaboration skills
• US citizenship required
• LOCATION: Onsite

GDIT IS YOUR PLACE
At GDIT, the mission is our purpose, and our people are at the center of everything we do.
Growth: AI-powered career tool that identifies career steps and learning opportunities
Support: An internal mobility team focused on helping you achieve your career goals
Rewards: Comprehensive benefits and wellness packages, 401K with company match, and competitive pay and paid time off
Community: Award-winning culture of innovation and a military-friendly workplace

OWN YOUR OPPORTUNITY
Explore an enterprise IT career at GDIT and you’ll find endless opportunities to grow alongside colleagues who share your desire to drive operations forward.

#CIS