Senior Systems Administrator – Windows/Linux, Tactical IT

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

Benefits offered by this job

Health insurance

Life Insurance & AD&D

Disability Insurance

Retirement plans

Holiday pay

STAR Award program

Job summary

Precise Systems, Inc. seeks a highly experienced System Administrator III to provide senior-level administration, sustainment, troubleshooting, security hardening, and technical leadership across Windows, Linux, virtualization, network, and tactical computing environments.

This role supports the stability, security, performance, and availability of servers, systems, network infrastructure, and mission-focused IT environments while helping guide remediation, patching, compliance, backup and

Qualifications

• Bachelor's degree or equivalent experience required.
• Current Security+ certification required.
• Active Secret clearance; U.S. Citizenship required.
• Extensive system and network administration experience in government/defense environments.
• Experience with Windows and Linux (Red Hat, CentOS, Rocky Linux).

Responsibilities

• Lead and support administration of Windows, Linux, ESXi, network, and tactical computing environments; manage installation, configuration, updates, monitoring, troubleshooting, optimization, and sustainment.
• Implement and maintain security hardening across systems and network infrastructure by supporting CMMC alignment, DISA STIG implementation, vulnerability remediation, patching, access control, threat monitoring, and secure configuration management.
• Assess, research, and remediate vulnerabilities by investigating exploits, evaluating cyber risk, coordinating fixes, applying updates, and documenting remediation actions.
• Develop, implement, and maintain backup and recovery procedures to protect data, preserve system availability, validate recovery processes, and support continuity of operations.
• Manage and troubleshoot network infrastructure including routers, firewalls, VPNs, DNS, DHCP, and related services.
• Support tactical systems and data architecture by troubleshooting tactical environments, deploying data pipelines, and supporting edge/server workloads.
• Monitor infrastructure products, licenses, performance, and End-of-Life considerations to support sustainment and modernization.
• Provide senior-level coordination and technical guidance to administrators, end users, cybersecurity teams, engineers, and stakeholders; document solutions and mentor team members.

Skills

Windows & Linux admin

Security hardening

CMMC compliance

DISA STIG guidelines

Vulnerability remediation

Networking TCP/IP DNS DHCP VPN

Backup and recovery

Troubleshooting & debugging

Team coordination & mentoring

Communication skills

Education

Bachelor's Degree or Equivalent Experience

Security+ Certification

Active Secret clearance

Tools

VMware

Docker

Kubernetes

PowerShell

Bash

Ansible

AWS

Job description

Precise Systems, Inc. seeks a highly experienced System Administrator III to provide senior-level administration, sustainment, troubleshooting, security hardening, and technical leadership across Windows, Linux, virtualization, network, and tactical computing environments.

This role supports the stability, security, performance, and availability of servers, systems, network infrastructure, and mission-focused IT environments while helping guide remediation, patching, compliance, backup and