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Windows Linux Administrator Jobs in California (NOW HIRING)

Raytheon

Sr. Windows System Administrator

Goleta, CA · On-site

Experience with Windows Server internals or Linux fundamentals to include DNS, DHCP, AD, and server ... Administrator. * Infrastructure backup, res.tore, disaster recovery and business continuity.

Raytheon

Sr. Windows System Administrator

Goleta, CA · On-site

Experience with Windows Server internals or Linux fundamentals to include DNS, DHCP, AD, and server ... Administrator. * Infrastructure backup, res.tore, disaster recovery and business continuity.

Raytheon

Windows System Administrator

El Segundo, CA · On-site

The System Administrator must possess a secret security clearance as they will be responsible for ... Experience supporting Microsoft Windows and/or Linux desktops; including working knowledge ...

Raytheon

Windows System Administrator

El Segundo, CA · On-site

The System Administrator must possess a secret security clearance as they will be responsible for ... Experience supporting Microsoft Windows and/or Linux desktops; including working knowledge ...

Woongjin, Inc

System (Linux) Admin

San Jose, CA · On-site

... Windows 2008/2k8R2/2k12, VMWare, and Apache web services. * Report Security Patch compliance ... Administrator (RHCSA), or Red Hat Certified Engineer (RHCE) preferred * Network equipment ...

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All JobsWindows Linux Administrator JobsWindows Linux Administrator Jobs in California

Windows Linux Administrator information

Infographic showing various Windows Linux Administrator job openings in California as of August 2026, with employment types broken down into 1% As Needed, 72% Full Time, 18% Part Time, and 9% Contract. Highlights an 91% Physical, 2% Hybrid, and 7% Remote job distribution.

Systems Administrator II (Digital Ecosystem)

San Diego, CA • On-site

Science Applications International Corporation
IT Services • 10K+ employees
Learn more about Science Applications International Corporationexternal

Full-time

Posted 3 days ago

New

SAIC rating

7.7

Company rating: 7.7 out of 10

Based on 82 frontline employees who took The Breakroom Quiz

Job description


SAIC is seeking a motivated and technically capable System Administrator II to support the administration, monitoring, troubleshooting, and sustainment of Windows, Linux, virtualization, network, and tactical computing environments. This mid-level role supports day-to-day system operations, user support, vulnerability remediation, patching, backup and recovery, system documentation, and performance monitoring across enterprise and mission-focused environments. The candidate will work with IT, cybersecurity, engineering, data, and operational teams to help maintain secure, reliable, and mission-ready systems. The role requires strong problem-solving skills, collaborative communication, and the ability to support both traditional IT infrastructure and tactical systems in a fast-moving technical environment.
THIS IS AN ONSITE ROLE IN SAN DIEGO, CA. WITH UP TO 5% OF TRAVEL INVOLVED
JOB DUTIES:
  • Administer and maintain Windows, Linux, ESXi, network, and tactical computing environments by supporting installation, configuration, updates, monitoring, and troubleshooting activities.
  • Support system security and compliance activities by assisting with patching, vulnerability remediation, security hardening, access control, cybersecurity guidelines, and audit-ready documentation.
  • Monitor server, network, and system performance by identifying issues, troubleshooting problems, supporting optimization efforts, and escalating complex technical risks as needed.
  • Support backup and recovery procedures by helping maintain data protection processes, validating system availability, and documenting recovery actions.
  • Provide end-user and technical team support by resolving system-related issues, answering technical questions, documenting troubleshooting steps, and coordinating follow-up actions.
  • Assist with network infrastructure support by helping maintain routers, firewalls, VPNs, and related network devices in coordination with senior administrators and engineering teams.
  • Support tactical systems and data environments by assisting with troubleshooting, tactical data pipeline monitoring, edge server operations, embedded GPU environments, and containerized workloads.
  • Maintain system documentation, configuration records, software inventories, license tracking, hardware tracking, and End-of-Life planning inputs to support infrastructure visibility and sustainment.

Qualifications
REQUIREMENTS:
  • Bachelors and two (2) years or more experience; Masters and 0 years related experience
  • Must be a U.S. Citizen
  • Must have an Active Secret Clearance to start
  • Must be able to obtain a TS/SCI after start
  • Experience working as a system administrator, IT specialist, network administrator, data engineer, database administrator, software engineer, machine learning engineer, geospatial engineer, or related technical role.
  • Intermediate experience using the Linux command line to support system administration, troubleshooting, file management, process management, and technical operations.
  • Experience supporting Windows and Linux operating systems, system configuration, user support, patching, monitoring, and troubleshooting activities.
  • Understanding of networking concepts and protocols such as TCP/IP, DNS, DHCP, VPNs, ports, routing, and firewall concepts.
  • Experience supporting cybersecurity, access control, vulnerability remediation, system hardening, patching, or secure configuration activities.
  • Strong problem-solving, analytical, time management, and multitasking skills in a dynamic technical environment.
  • Excellent written and verbal communication skills with the ability to work effectively with IT, cyber, engineering, data, and operational stakeholders.

DESIRED SKILLS:
  • Security + certification preferred
  • Familiarity with virtualization and containerization technologies such as VMware, Docker, Kubernetes, or related platforms.
  • Familiarity with edge servers, embedded GPUs, tactical computing hardware, Jetson Nano, DGX Spark, or similar mission hardware.
  • Experience troubleshooting tactical systems or supporting tactical data pipelines, including deployment, monitoring, sustainment, or improvement activities.
  • Familiarity with security assessment tools, vulnerability scanning tools, CMMC compliance concepts, DISA STIG guidance, operating system hardening, and network hardening.
  • Familiarity with shell scripting, automation, or configuration tools such as Bash, Python, Ansible, PowerShell, or similar technologies.
  • Familiarity with cloud and enterprise services such as Amazon Web Services, GCC High, Microsoft 365, Azure, Intune, or related environments.
  • Previous experience working with government agencies, Navy organizations, military users, or Department of War mission environments.
  • Passion for staying current with advancements in tactical data architecture, system administration, cybersecurity, and mission infrastructure technologies.

About Us
SAIC® is a premier mission integrator focused on advancing the power of technology and innovation to serve and protect our world. Our robust portfolio of offerings across the defense, space, intelligence, and civilian markets includes secure high-end solutions in mission IT, enterprise IT, engineering services, and professional services. We integrate emerging technology, rapidly and securely, into mission critical operations that modernize and enable critical national imperatives.
We are approximately 23,000 strong; driven by mission, united by purpose, and inspired by opportunities. SAIC is an Equal Opportunity Employer. Headquartered in Reston, Virginia, SAIC has annual revenues of approximately $7.3 billion. For more information, visit saic.com. For ongoing news, please visit our newsroom.

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