Cyber System Administrator, Senior

Job Title:

Cyber System Administrator, Senior

Job Category:
Security

Time Type:
Full time

Minimum Clearance Required to Start: TS/SCI

Employee Type:
Regular

Percentage of

Travel Required:

Up to 25%

Type of Travel:
Local

* * *

Join a team dedicated to advancing national security through innovative irregular warfare and operations expertise. CACI is looking for individuals to join a program that delivers mission-critical advisory, training, and operational support services that help mission partners stay ahead of rapidly evolving global threats. Working across geographic and functional combatant commands, these professionals play a vital role in developing, integrating, and sustaining mission-ready task forces that enhance joint force effectiveness and operational success.

This is an opportunity to contribute to high-impact missions, collaborate with experienced professionals, and support strategic operations that strengthen our nation's defense capabilities around the world. Candidates who thrive in dynamic environments, embrace complex challenges, and are committed to mission excellence will find meaningful opportunities for growth and impact within CACI and on this team.

• Administers, configures, and maintains classified and unclassified information systems supporting operational and mission requirements.
• Manages user accounts, roles, permissions, and access controls in accordance with security policies and least privilege principles.
• Monitors system performance, availability, and security using approved tools to identify and resolve issues.
• Implements system hardening, patch management, and configuration baselines to maintain cybersecurity compliance.
• Supports accreditation, authorization, and continuous monitoring activities in alignment with DoD cybersecurity requirements.
• Troubleshoots hardware, software, and network issues to ensure system reliability and continuity of operations.
• Maintains system documentation, configuration management records, and standard operating procedures.
• Coordinates with cybersecurity, network, and operations teams to support incident response and risk mitigation.
• Performs data backup, recovery, and continuity procedures to protect mission-critical information.
• Provides technical support and guidance to users and stakeholders on system capabilities and security best practices.

• TS/SCI clearance
• Bachelor’s degree in computer science, Information Technology, Cybersecurity, or related technical field
• 5 years executing cyber system administration responsibilities for DOW systems in TS or higher environment
• DoD 8570.01-M IAT Level II or IAT Level III certification (Security+ CE, CySA+, GICSP, GSEC, or SSCP)
• Computing Environment certification (Windows: MCSA or Linux+/RHCSA, or equivalent))
• Demonstrated experience managing Windows Server and/or Linux operating systems
• Proven experience implementing and maintaining cybersecurity controls and STIG compliance
• Experience with network administration including TCP/IP, DNS, DHCP, VPN, and firewall configurations
• Proficiency with Active Directory, Group Policy, and user access management
• Knowledge of virtualization technologies (VMware, Hyper‑V)

• DoD 8570.01-M IAM Level I, II, or III (CND, CISM, CISSP)
• Advanced technical certifications (CCNA, RHCE, MCSE, or equivalent)
• Cloud certifications (AWS, Azure, or CompTIA Cloud+)
• Strong written and verbal communication skills for technical documentation and briefings
• 5+ years of experience in DoD cyber operations or military IT environments
• Experience with DoD Risk Management Framework (RMF) and Authorization to Operate (ATO) processes
• Background supporting SCIF or other sensitive compartmented information environments
• Experience with cybersecurity incident response and forensic analysis
• Demonstrated experience with automation and scripting (Power Shell, Python, Bash)
• Familiarity with Dev Sec Ops  practices and CI/CD pipelines
• Experience with cloud infrastructure administration (AWS Gov Cloud, Azure Government)
• Previous experience with DISA guidance, CMMC compliance, or CNSSI standards

A culture of integrity.

At CACI, we place…