Zero-Trust Infrastructure & Systems Administrator

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

Job summary

CACI International is seeking an Infrastructure/Systems Administrator to support a zero-trust IT environment, spanning on‑prem and cloud. You will manage Linux, Windows, and macOS systems and collaborate with engineers, security, and IT teams to deliver reliable solutions.

The role emphasizes patching, hardening, and compliance, with a focus on continuous improvement and strong documentation across cross‑functional teams. Travel is up to 10% as needed.

Qualifications

• Bachelor’s degree or equivalent experience in IT/CS or related field.
• 5–7 years of hands-on Systems Administration experience supporting Linux and Windows.
• Working knowledge of 3–4 areas such as security, virtualization, cloud, monitoring, or identity management.
• Strong analytical, troubleshooting, and problem-solving skills.
• Ability to work independently with minimal supervision and take ownership of assigned technologies and services.
• Strong written and verbal communication skills with the ability to collaborate across technical, engineering, and support teams.
• Ability to create and maintain accurate technical documentation and operational procedures.
• Demonstrated ability to evaluate customer IT requirements and develop effective infrastructure solutions.

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

System Administration

Troubleshooting

Documentation

Independent Worker

Education

Bachelor’s degree in Information Technology, Computer Science, or related field

Tools

Red Hat Satellite

Landscape

Foreman

MECM

Centrify PAM

AWS

Azure

VMware

Nutanix

Splunk

Job description

CACI International is seeking an Infrastructure/Systems Administrator to support a zero-trust IT environment, spanning on‑prem and cloud. You will manage Linux, Windows, and macOS systems and collaborate with engineers, security, and IT teams to deliver reliable solutions.

The role emphasizes patching, hardening, and compliance, with a focus on continuous improvement and strong documentation across cross‑functional teams. Travel is up to 10% as needed.