On-Site Systems Administrator III - Defense IT & Networks

Precise Systems, Inc.; San Diego (CA); On-site; USD 150,000 - 170,000; Full time

Benefits offered by this job

Health insurance

Life and AD&D coverage

Disability insurance

Retirement plans

Holiday pay

Employee leave

Professional growth opportunities

Job summary

Precise Systems seeks a senior System Administrator III to lead senior-level administration, sustainment, and security hardening across Windows, Linux, and virtualized environments. You will coordinate with IT, cybersecurity, engineering, and program teams to maintain secure enterprise and tactical systems in government contexts.

This role requires in-person support and a high attention to compliance, patching, backup, and performance optimization, with leadership responsibilities for junior

Qualifications

• Bachelor’s Degree or equivalent experience and Security+ certification.
• Extensive system and network administration experience in secure IT environments.
• Experience with Windows and Linux enterprises, virtualization, and patching.

Responsibilities

• Lead and support administration of Windows, Linux, ESXi, network, and tactical computing environments.
• Implement and maintain security hardening with CMMC alignment and DISA STIGs.
• Remediate vulnerabilities, patch management, and secure configuration practices.
• Develop and maintain backup and recovery procedures for data protection.
• Manage network infrastructure, VPNs, DNS, DHCP, and related services.
• Support tactical systems, data pipelines, edge servers, and container workloads.
• Monitor performance, licensing, and End-of-Life considerations for Sustainment.
• Provide senior guidance, document solutions, and mentor team members.

Skills

System administration

Security hardening

Technical leadership

Troubleshooting

Windows/Linux

Networking concepts

Education

Bachelor’s Degree or Equivalent Experience

Security+ Certification

Tools

ESXi

VPNs

Cloud/Enterprise services

Automation tools

Job description

Precise Systems seeks a senior System Administrator III to lead senior-level administration, sustainment, and security hardening across Windows, Linux, and virtualized environments. You will coordinate with IT, cybersecurity, engineering, and program teams to maintain secure enterprise and tactical systems in government contexts.

This role requires in-person support and a high attention to compliance, patching, backup, and performance optimization, with leadership responsibilities for junior