Top Linux Systems Administrator Jobs

Administer and maintain enterprise Linux environments supporting testing, validation, and operational readiness. Configure operating systems and network components, troubleshoot Tier 1 and Tier 2 incidents, resolve hardware and OS issues, develop Bash automation scripts, monitor capacity and performance, optimize system reliability, and communicate operational status and resolutions to management and customers.

Manage procurement, deployment, and lifecycle of lab and data-center infrastructure. Build, configure, monitor, and troubleshoot servers, networking, virtualization, storage, and remote-management systems. Maintain runbooks, asset records, cabling, and operational processes while partnering with engineering, IT, facilities, and network teams to ensure capacity, availability, and site readiness.

Administer and maintain Linux systems across classified networks, including installation, patching, monitoring, backups, recovery, security auditing, configuration management, and troubleshooting. Coordinate with engineering, networking, cybersecurity, desktop, and project teams; support ticketing systems; test software releases; maintain documentation; and ensure compliance with classified information-system security requirements. The role is fully onsite in Azusa, California, requires occasional travel, after-hours support, equipment handling, and an active Secret clearance with eligibility for Top Secret.

Maintain Linux and Windows servers, workstations, networks, and virtual and physical infrastructure. Provide onsite IT support and escalations, support DevOps Linux requirements, manage privileged access, and coordinate compliance with information assurance teams. The role requires administering Ubuntu systems, AWS environments, multiple networks, and Risk Management Framework requirements while collaborating with vendors, customers, management, and development teams.

Maintain Linux and Windows servers, workstations, networks, and virtual and physical infrastructure. Provide onsite IT support and escalations, support DevOps Linux requirements, administer privileged access, and manage AWS environments. Coordinate with information assurance teams on compliance and Risk Management Framework requirements. Troubleshoot issues, work with vendors and customers, and adapt infrastructure to evolving organizational needs.

Administer and sustain large-scale Linux clusters, including software installation, configuration, monitoring, troubleshooting, security compliance, and performance enhancements. Manage compute, network, memory, and storage components; configure VMware virtualization environments; automate infrastructure using SaltStack and Ansible; support containerization; and use tools such as Red Hat Satellite, Splunk, HPE OneView, and Nagios. The role requires an active TS/SCI with polygraph, Security+, extensive systems administration experience, and a technical bachelor’s degree or equivalent experience.

Administer and secure RHEL/Linux infrastructure across development, test, and production environments. Responsibilities include system configuration, lifecycle management, patching, monitoring, troubleshooting, root-cause analysis, vulnerability remediation, security hardening, automation with Ansible, Bash, and Python, documentation, change control, and on-call support. The role collaborates with engineering and operations teams to maintain mission-critical systems in a secure national-security environment.

Manage and maintain Red Hat Enterprise Linux environments, troubleshoot hardware and operating system integrations, install software, apply patches, remediate SCAP and STIG vulnerabilities, maintain antivirus and Splunk reporting, manage accounts and access controls, and oversee backups, restoration testing, and data retention. Collaborate with cybersecurity teams and support engineering, software, simulation, and hardware development activities.

Serve as a Linux Systems Administrator SME supporting a mission-critical environment. Install, configure, secure, patch, and document Linux systems and virtualized/cloud environments. Diagnose networking issues, collaborate with developers and ISSO, automate tasks with scripts/tools, and lead system integration and maintenance activities.

Assist project teams with technical issues during project initiation and planning; ensure continued operation of Linux systems for wifi services.

Maintain and support multi-user Red Hat Linux systems and associated global network management infrastructure. Administer VMware environments, storage (SAN/NAS), enclave switches, scripting, DISA STIG hardening, AWS cloud resources, and SLAs. Provide documentation, on-call and emergency support, and mentor junior staff while tracking performance metrics.

Administer and support large-scale Linux infrastructure across physical and virtualized environments. Responsibilities include server configuration, monitoring, troubleshooting, patching, upgrades, application and Oracle database migrations, shell-script automation, performance tuning, capacity planning, backup and storage support, disaster recovery, root cause analysis, and collaboration with infrastructure and application teams.

Administer, maintain, monitor, and troubleshoot Linux servers. Deploy and migrate systems on AWS, architect cloud solutions, test new configurations, manage Apache or NGINX environments, troubleshoot networking issues, and implement load-balancing and monitoring solutions. Preferred experience includes orchestration tools, Jenkins, scripting languages, and RHCE certification.

The UNIX/Linux Systems Administrator is responsible for installing, configuring, and maintaining Linux systems, ensuring data integrity, and managing software solutions, among other responsibilities in a Systems Administration team.

Maintain and administer Red Hat Linux and Windows Server systems, supporting server farms and cloud environments (AWS). Perform system tuning, account and storage management (SAN/NAS), integrate NM/EM systems, apply DISA STIG security baselines, document procedures, coach junior staff, and provide M-F and on-call support with occasional travel. Track SLA/ALP metrics and support backups and recovery.

Administers and optimizes Red Hat Enterprise Linux infrastructure, including installation, monitoring, troubleshooting, patching, virtualization, and containerization. Develops and maintains Puppet manifests, modules, infrastructure-as-code scripts, and deployment templates. Uses version control and automation tools to manage configurations, supports service outages, documents systems, and assists team members. The role requires onsite work at Langley AFB, active TS/SCI clearance, and may involve 24/7/365 shift support.

Administers and optimizes Red Hat Enterprise Linux infrastructure, including server installation, monitoring, troubleshooting, patching, virtualization, and containerization. Maintains Puppet manifests and modules, develops infrastructure-as-code automation, manages version-controlled deployments, and supports service outages. The role requires onsite work at Langley AFB, active TS/SCI clearance, collaboration across teams, documentation, and assistance with 24/7/365 shift operations.

Provide senior Linux systems administration and engineering support in a Kubernetes-based Intelligence Community mission environment. Administer CentOS/RHEL systems, Kubernetes tooling, containers, and Bash-based workflows while supporting software productization. The role requires an active TS/SCI clearance with polygraph, Security+ certification, and at least 10 years of Linux administration or systems engineering experience. Desired qualifications include Red Hat certification, Python, Ansible, Salt, VMware, DevOps, classified networking, encryption, storage, authentication, and physical server administration experience.

Mid-level Linux Systems Administrator role supporting an aerospace and defense client onsite in Virginia Beach, VA. Must be a U.S. citizen with an active Secret clearance and fully vaccinated for COVID-19. Experience with cloud service providers and Kubernetes is preferred.

The Systems Administrator III manages Windows and Linux servers, VMware, O365, and IT infrastructure, providing support and mentoring to staff. Responsibilities include designing applications and maintaining business continuity plans.

Administer, harden, patch, and troubleshoot Linux servers and workstations for an Army air defense program. Support lab/dev environments, collaborate with engineers, document configurations, and respond to high-priority incidents to restore critical services.

Administer and maintain enterprise Linux environments supporting mission-critical testing and operational readiness. Responsibilities include system configuration, software installation, network component maintenance, Tier 1 incident troubleshooting, hardware support, Bash scripting, capacity analysis, monitoring, performance improvement, and customer communication. The role requires maintaining secure, stable, reliable, and repeatable Linux platforms for testing, validation, and deployment activities.

Provide hands-on support for lab hardware, OS, and applications in an embedded DoD environment. Perform STIG application, patching, vulnerability scanning, backups, scripting, and automation with Ansible. Troubleshoot hardware, OS, applications, and network issues while ensuring compliance with DoD security standards.

The Linux Systems Administrator supports lab environments by maintaining hardware and operating systems, ensuring compliance, troubleshooting issues, and collaborating with teams.

Leads enterprise Linux architecture, administration, governance, and lifecycle activities for classified government systems. Designs backup, disaster recovery, high-availability, virtualization, containerization, networking, identity, monitoring, and security solutions. Directs system enhancement projects, automation, documentation, and cross-platform operations while resolving complex issues independently. Provides technical mentorship and leadership across teams. Requires on-site work, after-hours support as needed, a current Top Secret clearance with SCI eligibility, IAT Level II certification, and ability to obtain a CI polygraph.