Senior System Administator - TS​/SCI Clearance

Description The Senior System Administrator will support the administration, maintenance, security, and optimization of mission-critical Windows-based infrastructure in a secure federal environment. This role requires an experienced administrator with strong technical troubleshooting skills, a proactive approach to system performance and reliability, and the ability tooperateeffectively in environments requiring an active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance.

Description The Senior System Administrator will support the administration, maintenance, security, and optimization of mission-critical Windows-based infrastructure in a secure federal environment. This role requires an experienced administrator with strong technical troubleshooting skills, a proactive approach to system performance and reliability, and the ability tooperateeffectively in environments requiring an active Top Secret/Sensitive Compartmented Information (TS/SCI) clearance.

• Administer,maintain, and troubleshoot Windows Server and Windows desktop environments across classified or secure enterprise networks.
• Manage Active Directory, Group Policy Objects, DNS, DHCP, user accounts, security groups, organizational units, and domain controller operations.
• Perform system monitoring, performance tuning, capacity planning, patch management, vulnerability remediation, and root cause analysis.
• Install, configure, upgrade, and support operating systems, enterprise applications, server hardware, and virtualized infrastructure.
• Develop,maintain, and execute standard operating procedures for system builds, configuration baselines, software deployments, and maintenance activities.
• Support compliance with applicable security standards, including DISA STIGs, vulnerability scan remediation, change control, and configuration management requirements.
• Provide Tier II/III support for escalated incidents involving servers, workstations, applications, authentication, permissions, and enterprise services.
• Use Power Shell or other scripting tools to automate routine administration, reporting, software deployment, and maintenance tasks.
• Coordinate with cybersecurity, network, engineering, and help desk teams to support secure and reliable system operations.
• Mentor junior administrators andprovidetechnical guidance on troubleshooting, documentation, and operational best practices.

• Active TS/SCI clearance isrequiredat the time ofhire.
• U.S. citizenship is required due to federal contract and clearance requirements.
• 8+ years of relevant experience in systems administration, infrastructure operations, or enterprise IT support.
• Strong hands‑on experience administering Microsoft Windows Server and Windows workstation environments.
• Experience with Active Directory, Group Policy, DNS, DHCP, domain services, user permissions, and enterprise authentication.
• Experience with patching, vulnerability remediation, system hardening,and applying secure configuration baselines.
• Ability to troubleshoot complex hardware, software, operating system, authentication, and network‑related issues.
• Experience supporting secure or classified environments, including adherence to change management and documentation requirements.
• Strong written and verbal communication skills, with the ability to document procedures and brief technical status to stakeholders.
• DoD 8570/8140 IAT Level II certification, such as Security+ CE, or the ability to obtain/maintain required compliance certification, is a plus.
• Experience with VMware, Hyper‑V, Nutanix, or other enterprise virtualization platforms,is a plus.
• Experience with Microsoft Endpoint Configuration Manager, SCCM, MECM, PDQ Deploy, or similar software deployment tools, is a plus.
• Familiar…