Zero-Trust Infrastructure & Systems Admin

CACI International Inc; Danbury (CT); On-site; USD 104,000 - 218,000; Full time

Job summary

CACI International Inc is seeking an Infrastructure/Systems Administrator to support a zero-trust IT environment, administering Linux, Windows, and macOS across servers and workstations. You will collaborate with engineering and IT teams to deliver reliable solutions and improve security and compliance across programs.

The role emphasizes hands-on patching, cloud and virtualization support (AWS, Azure, VMware, Nutanix), security hardening, and documentation, with up to 10% travel and strong

Qualifications

• Bachelor's degree in Information Technology, Computer Science, or related field, or equivalent experience.
• 5–7 years of hands-on Systems Administration experience supporting Linux and Windows environments.
• Working knowledge of patch management, PAM, scripting, cloud/virtualization, and security hardening.

Responsibilities

• Administer multi-OS environments including Red Hat, Ubuntu, Windows, and macOS across servers and workstations.
• Troubleshoot infrastructure issues involving servers, storage, networking, and security in remote and on-site environments.
• Perform patching, package management, and compliance activities using tools such as Red Hat Satellite, Landscape, Foreman, MECM, or similar technologies.
• Manage identity and access services, including authentication and privileged access management using Centrify or comparable PAM solutions.
• Support AWS, Azure, VMware, Nutanix, or similar cloud and virtualization platforms.
• Collaborate with engineering, security, and support teams to resolve complex cross‑platform infrastructure issues.
• Support a zero‑trust security posture through system hardening, encryption, device controls, and security best practices.
• Support NIST compliance and security requirements within the IT environment.
• Utilize Splunk and related monitoring/logging technologies for system visibility, troubleshooting, and operational support.
• Develop, maintain, and improve technical documentation, procedures, and operational standards.
• Identify opportunities to improve infrastructure processes, tooling, automation, and service delivery.
• Evaluate IT requirements for internal, remote, and external customers and develop effective technical solutions.
• Independently manage assigned services and technologies while maintaining accountability for operational performance.
• Propose new ideas, challenge existing processes when appropriate, and contribute to continuous improvement initiatives.

Skills

Linux administration

Windows administration

macOS administration

Identity and access management

Security hardening

Troubleshooting

Documentation

Education

Bachelor's degree or equivalent experience

Tools

Red Hat Satellite

MECM

Landscape

Centrify

VMware

Nutanix

Splunk

Job description

CACI International Inc is seeking an Infrastructure/Systems Administrator to support a zero-trust IT environment, administering Linux, Windows, and macOS across servers and workstations. You will collaborate with engineering and IT teams to deliver reliable solutions and improve security and compliance across programs.

The role emphasizes hands-on patching, cloud and virtualization support (AWS, Azure, VMware, Nutanix), security hardening, and documentation, with up to 10% travel and strong