Senior Systems Administrator & Security Engineer (TS/SCI)

CACI International Inc; Chantilly (VA); On-site; USD 87,000 - 182,000; Full time

Job summary

CACI International Inc. is seeking a Systems Administrator/Engineer with TS/SCI w/ Poly for a hands-on, security-focused role in Chantilly, VA. You will own Windows server and workstation administration, AD/DNS/PKI, and patch management across production environments.

The position emphasizes scripting (PowerShell), vulnerability scanning (Nessus), and RMF/ComMon compliance, with experience in hardware, storage, and service management using SNOW. Expect up to 10% travel.

Qualifications

• 5+ years of experience in Windows Server and Desktop installation, configuration, and deployment.
• Direct experience with Active Directory administration, GPO implementation, and WSUS management.
• Hands-on proficiency with an enterprise management tool (SCCM, MCM, or ManageEngine).
• Experience using Nessus for vulnerability/compliance scans and a current CompTIA Security+ certification.

Responsibilities

• Systems & Network Administration: Deploy, configure, and administer physical Windows servers and workstations.
• Core Identity Services: Manage Active Directory, DNS, PKI, certificate lifecycles, and GPOs.
• Automation & Tools: Use PowerShell for automation; leverage SCCM, WSUS, and ManageEngine for endpoint management.
• Application Hosting: Administer the Workamajig project management server in a production environment.
• Hardware & Security Engineering: Optimize high-speed storage over a 25Gb+ backbone; handle rack-mounting and cabling.
• Security & Compliance: Run vulnerability scans with Nessus; apply patches; align with RMF and ComMon.
• Operations: Use ServiceNow for incident tracking, change management, and documentation.

Skills

Windows administration

Active Directory administration

GPO management

PowerShell scripting

Security compliance

Tools

SCCM

WSUS

ManageEngine

Nessus

Job description

CACI International Inc. is seeking a Systems Administrator/Engineer with TS/SCI w/ Poly for a hands-on, security-focused role in Chantilly, VA. You will own Windows server and workstation administration, AD/DNS/PKI, and patch management across production environments.

The position emphasizes scripting (PowerShell), vulnerability scanning (Nessus), and RMF/ComMon compliance, with experience in hardware, storage, and service management using SNOW. Expect up to 10% travel.