Active Directory Systems Administrator - TS​/SCI w​/Poly

ACTIVE DIRECTORY SYSTEMS ADMINISTRATOR

Type of Requisition: Pipeline

Clearance Level Must Currently Possess: Top Secret SCI + Polygraph

Clearance Level Must Be Able to Obtain: Top Secret SCI + Polygraph

Public Trust/Other

Required:

None

Job Family: IT Infrastructure and Operations

Job Qualifications:

Skills: Active Directory Domain Services (AD DS), Active Directory Federation Services (AD FS), Domain Controllers, Group Policy, Group Policy Objects (GPO)

Certifications: None

Experience: 8+ years of related experience

US Citizenship

Required:

Yes

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.

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.

As an Active Directory Systems Administrator supporting CIS, you will sustain and secure enterprise directory services that enable authentication, authorization, and identity management across complex, multinetwork environments. You will maintain Active Directory forests, domains, and Group Policy, ensure directory service availability, and deliver reliable identity‑driven capabilities that underpin critical mission systems. Your work strengthens security, consistency, and operational readiness across the enterprise.

• Administer and maintain Active Directory forests, domains, trust relationships, replication services, and enterprise directory components.
• Manage and troubleshoot identity services, including DNS integrated AD functions, authentication, Kerberos/NTLM, group membership, and object lifecycle management.
• Create, maintain, and troubleshoot Group Policy Objects (GPOs) to enforce secure, standardized configurations across multiple networks and client baselines.
• Perform Tier 2/3 directory service support, resolving complex AD, DNS, GPO, and authentication issues across distributed environments.
• Support AD integrated services including certificate services, federation services, domain controllers, and directory dependent applications.
• Execute domain controller deployments, configuration updates, schema extensions, and lifecycle upgrades in alignment with operational and security requirements.
• Monitor AD health, replication status, event logs, and performance to ensure availability and integrity of directory services.
• Maintain directory service documentation, configuration baselines, and operational procedures.
• Collaborate with engineering, cybersecurity, and operations teams to support design changes, new identity capabilities, and secure directory implementations.
• Execute patching and compliance tasks for AD, DNS, and directory integrated systems.
• Identify and remediate patching gaps, and document corrective actions.

• EDUCATION: Bachelor’s degree in an IT‑related field, or 8-12+ years of relevant IT experience in lieu of a degree.
• CERTIFICATION: 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 AD, Group Policy, DNS, and authentication services in enterprise or multidomain environments.
• Strong knowledge of AD health monitoring, replication, domain controller management, OU structure design, and secure configuration practices.
• Experience troubleshooting complex authentication, GPO, DNS, and directory integrated application issues.
• Familiarity with STIGs, patching workflows, vulnerability remediation, and configuration compliance requirements.
• Strong documentation, communication, and cross‑team collaboration skills.
• US citizenship required.
• LOCATION: Onsite.

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.

Supp…