Secret-Cleared Classified Systems Admin & ISSO

CACI International Inc.; Herndon (VA); On-site; USD 104,000 - 218,000; Full time

Job summary

CACI International Inc. in Herndon, Virginia, seeks a Classified Systems Administrator and ISSO to support and maintain mission-critical classified information systems in a secure environment.

This role blends systems engineering, cybersecurity, virtualization, and IA duties to ensure reliability, security, and compliance. The ideal candidate will manage Windows Server infrastructure and virtualization (VMware, Hyper-V, Nutanix), administer enterprise services, and support DoD/NISPOM compliance.

Qualifications

• 7+ years of Systems Engineering and Systems Administration experience.
• Active Secret clearance required.
• Experience administering Windows Server environments with patching and performance tuning.
• Hands-on virtualization experience with VMware, Hyper-V, and Nutanix.
• Experience with vulnerability remediation using tools like Nessus.
• Strong AD, DNS, DHCP, and Group Policy administration.
• Excellent troubleshooting, analytical, and communication skills.

Responsibilities

• Install, configure, and maintain Microsoft Windows Server operating systems in classified environments.
• Manage virtualization platforms (VMware, Hyper-V, Nutanix) for availability and security.
• Administer enterprise services (Exchange, SQL Server, Jira, Confluence) and security tools.
• Troubleshoot hardware, software, networking, and infrastructure issues across networks.
• Monitor performance, apply patches, and implement security mitigations.
• Prepare SIA packages and coordinate approvals for changes.

Skills

Windows Server

VMware

Hyper-V

Nutanix

Active Directory

DNS

DHCP

Group Policy

Nessus

Security+

Education

Bachelor's degree or equivalent experience

Tools

VMware

Hyper-V

Nutanix

Nessus

Job description

CACI International Inc. in Herndon, Virginia, seeks a Classified Systems Administrator and ISSO to support and maintain mission-critical classified information systems in a secure environment.

This role blends systems engineering, cybersecurity, virtualization, and IA duties to ensure reliability, security, and compliance. The ideal candidate will manage Windows Server infrastructure and virtualization (VMware, Hyper-V, Nutanix), administer enterprise services, and support DoD/NISPOM compliance.