Systems Administrator III (Digital Ecosystem)

PMAT • San Diego, CA

10h • $150,000 - $170,000 • Onsite

About The Position

At PMAT, we work on mission critical systems that directly support the warfighter, designing, building, and securing modern digital capabilities across cloud, data, and software environments. Our teams tackle complex, real-world challenges where delivery matters more than theory, and innovation is driven by curiosity, collaboration, and purpose. In this role, you’ll contribute to Naval Operational Architecture (NOA), working alongside engineers and operators to deliver resilient, forward-leaning solutions in support of national defense. PMAT is seeking 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 recovery, monitoring, and infrastructure improvement efforts. The candidate will work closely with IT, cybersecurity, engineering, data, cloud, and operational teams to support secure enterprise and tactical systems in government or defense-related environments. The role requires senior-level technical judgment, hands-on administration expertise, strong communication skills, and the ability to support both technical execution and team coordination.

Requirements

• Extensive experience in system administration, network administration, IT infrastructure, tactical systems support, or related technical infrastructure roles.
• Strong experience administering Windows and Linux operating systems, including Red Hat, CentOS, Rocky Linux, or similar enterprise Linux environments.
• Experience managing servers, virtualization environments, network infrastructure, VPNs, hardware, software, system updates, backup and recovery, monitoring, and troubleshooting activities.
• Strong understanding of cybersecurity, access control, vulnerability remediation, patch management, system hardening, network hardening, and secure configuration practices.
• Experience supporting enterprise, tactical, government, military, or mission-focused IT environments requiring high standards for security, reliability, and compliance.
• Strong understanding of networking concepts and protocols such as TCP/IP, DNS, DHCP, VPNs, routing, firewalls, ports, and network troubleshooting.
• Strong analytical, problem-solving, time management, multitasking, and prioritization skills in a fast-moving technical environment.
• Strong written and verbal communication skills with the ability to explain technical issues, risks, remediation actions, and recommendations to IT, cybersecurity, engineering, program, and operational stakeholders.
• Bachelor’s Degree or Equivalent Experience
• Current Security+ Certificate
• U.S. Citizenship required
• No dual citizenship
• SECRET security clearance required
• TS/SCI Eligible security clearance a plus

Nice To Haves

• Senior-level experience leading or supervising teams of network administrators, system administrators, IT specialists, or technical infrastructure personnel.
• Experience with CMMC compliance, DISA STIG guidelines, operating system hardening, network hardening, security assessment tools, vulnerability scanning tools, and cyber remediation workflows.
• Experience with shell scripting, automation, and configuration tools such as Bash, Python, Ansible, PowerShell, or similar technologies.
• Experience with virtualization and containerization technologies such as VMware, Docker, Kubernetes, or related platforms.
• Experience with cloud and enterprise services such as Amazon Web Services, GCC High, Microsoft 365, Azure, Intune, or related environments.
• Experience with edge servers, embedded GPUs, tactical computing hardware, Jetson Nano, DGX Spark, or similar mission hardware.
• Experience deploying, monitoring, troubleshooting, and improving tactical data pipelines or tactical data architecture in operational or test environments.
• Previous experience working with government agencies, Navy organizations, military users, or Department of War mission environments.
• Experience maintaining detailed system documentation, configuration records, troubleshooting procedures, license tracking, End-of-Life planning, and infrastructure sustainment artifacts.

Responsibilities

• Lead and support administration of Windows, Linux, ESXi, network, and tactical computing environments by managing installation, configuration, updates, monitoring, troubleshooting, optimization, and sustainment activities.
• 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 recommended fixes, applying security 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, network devices, connectivity issues, routing, DNS, DHCP, and related enterprise or tactical network services.
• Support tactical systems and data architecture by troubleshooting tactical environments, deploying and monitoring tactical data pipelines, improving data flow reliability, and supporting edge server, embedded GPU, and containerized workloads.
• Monitor infrastructure products, hardware, software, licenses, system performance, compatibility, and End-of-Life considerations to support sustainment planning and infrastructure modernization.
• Provide senior-level coordination and technical guidance to administrators, end users, cybersecurity teams, engineers, and program stakeholders by documenting technical solutions, mentoring team members, communicating status, and supporting issue resolution.

Benefits

• We recruit, retain, and foster a team motivated to pursue passions, investigate new ways of doing things, and embody an innovative and entrepreneurial spirit.
• We believe in being curious about every element of a problem and experiment relentlessly.
• We foster continuous learning in an environment that encourages positive collaboration and expands our capabilities.
• We tap into collective intelligence, acknowledging that the most brilliant people may not be in the room.
• We are passionate about mission-centric design and delivering effective capabilities to and for the warfighter.

What This Job Offers

• Job Type: Full-time
• Career Level: Senior
• Education Level: Associate degree