Job Description

At CACI, we specialize in providing innovative and secure IT solutions to our clients in the defense and national security sectors. Our mission is to support critical infrastructure with the highest standards of service and reliability. We’re looking for a skilled System Administrator to join our team and help maintain, troubleshoot, and optimize a wide variety of IT systems. We are hiring a seasoned System Administrator – Level 3 to provide advanced technical leadership and hands-on support for implementation, troubleshooting, optimization, and maintenance of IT systems. This role supports complex enterprise infrastructure and architecture, including UNIX/Linux/Windows systems, virtual environments, and mission systems. The ideal candidate will bring extensive experience in system engineering, security compliance, escalation resolution, and mission-aligned IT environments. Responsibilities: Lead implementation, configuration, troubleshooting, and maintenance of complex IT systems; Manage day-to-day operations, system monitoring, and performance optimization across diverse platforms; Provide Tier 1, Tier 2, and Tier 3 technical support and root cause analysis for escalated issues; Perform account lifecycle management and ensure compliance with Identity & Access Control Management (ICAM) policy; Ensure proper application of security patches (IAVA) and maintain accurate tracking in systems of record; Conduct detailed system analysis and capacity planning; Analyze and resolve hardware/software integration issues across server and network infrastructures; Design and support system architecture and hardware requirements in mission environments; Apply expert knowledge of UNIX, Linux, and Windows systems and networking; Coordinate system changes with ISSO and ISO, and maintain documentation per Change & Configuration Management policies; Support the Plan of Action & Milestones (POA&M) and security authorization process; Maintain and support Trusted Thin Client, enhanced VDI, and mission island concepts as required; Leverage understanding of Service-Oriented Architecture (SOA) and interdependencies between systems; Communicate effectively with agency leadership, internal customers, and service teams; If assigned to Directory Services TTOs: manage and support Active Directory, Identity Management, SCCM, DNS, Group Policy, MS Exchange, Active Roles Server, and Privileged Account Management (PAM). Qualifications: Bachelor’s degree in a technical field (4 additional years of SA experience may substitute for degree); 15+ years of experience as a System Administrator supporting complex programs and environments; 6 years of experience in IT Service Management (ITSM). Certifications: DoD 8570 IAT Level II compliant (e.g., Security+ CE, CCNA Security, or equivalent); Computing Environment (CE) Certification (Microsoft OS, Red Hat/CentOS, or equivalent); ITIL 4 Foundation certification (required). Preferred Skills: Expertise with system integration, hardware/software troubleshooting, and enterprise environments; Familiarity with Trusted Thin Client, enhanced VDI technologies (e.g., remote GPU, memory scaling), and mission islands; Experience designing and maintaining secure environments compliant with federal security standards; Strong understanding of directory and identity services architecture, especially in classified environments.

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