Systems Administrator III (Digital Ecosystem) San Diego, California

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

Benefits offered by this job

Health insurance

Life and accidental death coverage

Disability insurance

Retirement plans

Holiday pay

Employee-managed leave

Professional growth opportunities

Job summary

Precise Systems Inc. in San Diego seeks a System Administrator III to lead senior IT administration and security hardening across Windows, Linux, virtualization, and network environments. The role supports secure enterprise and tactical systems within government or defense-related settings.

This in-person position requires strong communication, patching, incident response, and collaboration with IT, cybersecurity, engineering, and program teams to sustain mission-ready IT infrastructure.

Qualifications

• Extensive system administration experience in Windows and Linux environments.
• Experience with security hardening, patching, and vulnerability remediation.
• Background in government, military, or mission-focused IT environments.
• Strong communication and leadership skills for team coordination.

Responsibilities

• Lead and support admin of Windows, Linux, ESXi, network, and tactical computing envs.
• Implement security hardening and maintain CMMC/ DISA STIG alignment.
• Remediate vulnerabilities, apply updates, document actions.
• Develop backup and recovery procedures and ensure data availability.
• Troubleshoot network infrastructure and tactical data pipelines.
• Provide senior guidance, mentorship, and stakeholder communication.

Skills

Windows

Linux

ESXi

Networking

Security hardening

CMMC

DISA STIG

Backup & recovery

Troubleshooting

Documentation

Leadership

Education

Bachelor’s Degree or Equivalent Experience

Current Security+ Certificate

Tools

VMware

Docker

Kubernetes

Ansible

PowerShell

Bash

Python

Job description

Precise Systems delivers integrated, mission-ready solutions that advance warfighter readiness and strengthen our nation’s most critical defense programs. Through the power of our combined capabilities, we provide deep expertise in Advanced Engineering; Digital Transformation; Electromagnetic Warfare; Interactive Training & Simulation; Physical Sciences Research; Platform Lifecycle Support; and Foreign Military Sales. Unified by decades of trusted performance and expanded through strategic growth, our team applies innovative technologies, engineering rigor, and customer-focused execution to solve complex challenges and accelerate mission success. Guided by our commitment to partnership, precision, and performance, we deliver the scalable solutions and technical excellence our customers depend on—today and into the future.

Precise 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.

This role requires in-person support.

Duties:

• 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.

Required Education:

• Bachelor’s Degree or Equivalent Experience
• Current Security+ Certificate

Required Experience:

• 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.

Preferred Experience:

• 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.
• TS/SCI Eligible security clearance a plus

Must have current/active Secret security clearance. Due to the sensitivity of customer related requirements, U.S. Citizenship is required.

Precise Systems values employee contributions, promotes diverse opportunities for professional growth, and prioritizes overall well‑being. Our comprehensive professional services benefits package includes

• health insurance
• life and accidental death and dismemberment coverage
• disability insurance
• retirement plans
• holiday pay
• employee‑managed leave
• professional growth opportunities

We recognize exceptional performance and alignment with our core values through our STAR Award recognition program.

Compensation at Precise Systems is determined by various factors, including education, experience, skills, competencies, and contract‑specific requirements. The salary range for this position is $150,000.00-$170,000.00 (annualized USD). This range represents the standard pay for this role and is just one component of Precise Systems’ total compensation package.

Precise Systems is committed to fair and equitable pay practices in alignment with applicable pay transparency laws and equal employment opportunity standards.

Precise Systems is dedicated to a shared vision and core values of Integrity, Respect, and Responsibility, which foster innovation and drive our continued success in the global marketplace. Precise Systems and its subsidiaries are Equal Opportunity /Affirmative Action Employers. All qualified applicants will receive consideration for employment without regard to race, color, religion, age, sex, sexual orientation, gender identity, national origin, protected veteran status, status as an individual with a disability, or any legally protected status under federal, state, or local law. Visit www.GoPrecise.com for a listing of current openings and our comprehensive, employee friendly benefits summary. Precise Systems participates in E-Verify.