Senior Systems Administrator — Defense & Tactical IT

PMAT; San Diego (CA); On-site; USD 120,000 - 160,000; Full time

Job summary

PMAT is seeking a highly experienced System Administrator III to provide senior-level administration, security hardening, and technical leadership across Windows, Linux, virtualization, and network environments.

You will support secure enterprise and tactical IT systems for government or defense programs, collaborating with IT, cybersecurity, engineering, data, and operations teams to ensure stability and compliance.

Qualifications

• Extensive experience administering Windows and Linux environments.
• Strong experience with virtualization, patching, and security hardening.
• Background supporting enterprise and tactical IT in government/military settings.
• Solid networking knowledge and ability to communicate risk and remediation.

Responsibilities

• Lead and support administration of Windows, Linux, ESXi, network, and tactical computing environments.
• Implement security hardening and support DISA STIG/CMMC alignment and vulnerability remediation.
• Develop and maintain backup/recovery procedures and monitor performance.
• Coordinate with IT, cybersecurity, engineering, data, cloud, and operations teams.
• Mentor staff, document solutions, and support issue resolution.

Skills

Windows administration

Linux administration

Networking

Cybersecurity

Troubleshooting

Communication

Education

Bachelor’s Degree or Equivalent Experience

Current Security+ Certificate

Tools

VMware

Docker

Kubernetes

Ansible

PowerShell

AWS / GCC High

Job description

PMAT is seeking a highly experienced System Administrator III to provide senior-level administration, security hardening, and technical leadership across Windows, Linux, virtualization, and network environments.

You will support secure enterprise and tactical IT systems for government or defense programs, collaborating with IT, cybersecurity, engineering, data, and operations teams to ensure stability and compliance.