Senior System Administrator

Senior System Administrator

Job Category: Information Technology

Time Type: Full time

Minimum Clearance Required to Start: TS/SCI with Polygraph

Employee Type: Regular

Percentage of Travel Required: None

Type of Travel: None

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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 seeking an accomplished System Administrator – Level 4 to lead and support complex enterprise IT environments, with a focus on high-assurance systems. This senior-level position involves architecture support, advanced troubleshooting, security compliance, and operational oversight across a range of IT platforms including UNIX, Linux, and Windows systems. The ideal candidate brings extensive hands-on experience, deep system knowledge, and leadership in IT service and security management.

Responsibilities:

• Oversee and support the implementation, configuration, maintenance, and troubleshooting of enterprise IT systems

• Manage the operation and configuration of server, storage, and network systems, including mobile device environments

• Deliver Tier 1 through Tier 3 support, including advanced issue escalation and root cause analysis

• Provide detailed technical feedback and reporting to agency leadership and internal customers

• Lead system account management, ensuring full compliance with ICAM policies

• Implement and document security patches (IAVA) and maintain system-of-record accuracy

• Conduct in-depth analysis for system capacity planning and performance optimization

• Configure and manage UNIX, Linux, and Windows operating systems; apply enhancements to improve reliability and efficiency

• Work with ISSOs and ISOs on change and configuration management processes

• Track and report progress of POA&M milestones, supporting accreditation and security authorization activities

• Troubleshoot complex integration issues involving server hardware, mission applications, and middleware

• Design and support mission architectures and associated hardware platforms

• Understand and address dependencies within Service-Oriented Architecture (SOA) environments

• Apply working knowledge of mission islands, Trusted Thin Client, and enhanced Virtual Desktop Infrastructure (VDI) environments, including GPU and memory scaling

• If assigned to Directory Services TTOs, administer and support:

• Active Directory, DNS, Group Policy, Identity Management, Active Roles Server, Privileged Access Management (PAM), SCCM, and MS Exchange

Qualifications:

• Bachelor’s degree in a technical discipline (4 years of additional experience may substitute)

• 20+ years of experience as a System Administrator on programs of similar scope and complexity

• 8+ years of experience with IT Service Management (ITSM)

• Certifications:

• DoD 8570 IAT Level III certification (e.g., CASP+, CISSP, or equivalent)

• Computing Environment (CE) Certification (Microsoft OS, CentOS, or Red Hat OS)

• ITIL 4 certification

Preferred Skills:

• Deep familiarity with federal cybersecurity frameworks and secure enterprise IT environments

• Advanced knowledge of systems design, hardware/software integration, and interdependent system relationships

• Strong communication skills and the ability to liaise across technical and management teams

• Proven leadership in managing classified system environments with high availability and mission-critical demands

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What You Can Expect:

 

A culture of integrity.

At CACI, we place character and innovation at the center of everything we do. As a valued team member, you’ll be part of a high-performing group dedicated to our customer’s missions and driven by a higher purpose – to ensure the safety of our nation.

 

An environment of trust.

CACI values the unique contributions that every employee brings to our company and our customers - every day. You’ll have the autonomy to take the time you