Systems Engineer/Administrator Lead

CACI International • Danbury, CT

12d • $131,800 - $290,000

About The Position

CACI is seeking a Classified Systems Engineer/Administrator to support and maintain mission-critical classified information systems in a secure environment and serve as the site lead in Danbury, Connecticut. The position combines systems administration and systems engineering, with work across technical and security teams to maintain system performance, address vulnerabilities, support configuration changes, and ensure classified systems comply with applicable DoD, DCSA, and NISPOM requirements. The role includes administration of Windows Server and Linux systems, virtualization platforms, enterprise applications, storage, identity and access management, and cybersecurity tools. Travel is up to 10% within the Continental United States.

Requirements

• Active TS/SCI clearance with Polygraph.
• Bachelor’s degree in Information Technology, Computer Science, Systems Engineering, Cybersecurity, or a related discipline, or an equivalent combination of education, technical training, certifications, and professional experience.
• At least 7 years of relevant Systems Administration, Systems Engineering, or related enterprise IT experience.
• CompTIA Security+ certification or another applicable DoD-approved cybersecurity certification.
• Extensive experience administering Microsoft Windows Server environments, including installation, configuration, patch management, maintenance, troubleshooting, and performance optimization.
• Hands-on experience supporting virtualization technologies such as VMware, Hyper-V, and/or Nutanix.
• Experience identifying and remediating system vulnerabilities and implementing security mitigations.
• Expertise in Active Directory and Group Policy.
• Network experience, including Cisco, datacenter, and firewall environments.
• Proven experience leading projects, managing large teams, and working with leaders on the high-side.

Nice To Haves

• Linux experience, preferably Red Hat.

Responsibilities

• Install, configure, administer, maintain, and troubleshoot Microsoft Windows Server and Linux operating systems across classified environments.
• Manage VMware, Microsoft Hyper-V, and Nutanix virtualization platforms to ensure availability, performance, scalability, and security.
• Administer enterprise services and applications, including Microsoft Exchange and Microsoft SQL Server.
• Troubleshoot and resolve complex hardware, software, networking, operating system, application, and infrastructure issues across classified networks.
• Manage enterprise storage platforms, including Pure Storage, Dell PowerVault, and Synology appliances.
• Administer Microsoft Active Directory, including classified user account provisioning, access modifications, permissions, Group Policy, DNS, and DHCP in accordance with security requirements.
• Maintain inventory, configuration, and accountability records for classified IT assets, removable media, hardware, and peripheral equipment in accordance with DCSA requirements.
• Prepare and submit Security Impact Analysis (SIA) packages for proposed hardware, software, system, and configuration changes, and coordinate approvals before implementation.
• Mentor junior technicians and system administrators, share technical knowledge, and support consistent system administration practices.
• Collaborate with cybersecurity, engineering, infrastructure, and program teams to identify technical risks and implement secure, sustainable solutions.
• Participate in scheduled after-hours maintenance, system upgrades, incident response, and outage support as mission requirements dictate.
• Lead projects, manage large teams, and work with leaders on the high-side.

Benefits

• Flexible time off benefit.
• Learning and development opportunities.
• Healthcare, wellness, financial, retirement, family support, continuing education, and time off benefits.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior