Top Linux Systems Administrator Jobs

Administer secure and air-gapped enterprise systems, including installation, configuration, upgrades, patching, virtualization, Windows and Linux environments, monitoring, troubleshooting, documentation, and Tier II support. The role maintains compliance and security standards, supports users, resolves infrastructure issues, and escalates problems as needed. It is onsite in El Segundo, California, requires U.S. citizenship and the ability to obtain a Secret clearance, and may involve occasional travel.

Administer and maintain enterprise Linux infrastructure, primarily RHEL, along with VMware virtualization platforms and Microsoft services. Responsibilities include monitoring, troubleshooting, patching, performance optimization, security hardening to CIS and STIG standards, repository and lifecycle management, automation, RBAC, and infrastructure support across on-premises and hybrid environments.

Supports military training exercises by designing, configuring, and managing Linux-based testing and exercise networks. Maintains Linux servers, Cisco switches, physical and virtual infrastructure, Active Directory domains, group policies, accounts, and organizational units. Performs security scanning, prepares operating system distributions, and maintains equipment inventories. Requires Linux and Active Directory expertise, Security+ certification, a technical degree, two years of experience, and the ability to obtain a TS/SCI clearance.

Operate and maintain a production Kubernetes platform and Linux systems supporting a secure DoD intelligence data pipeline. Responsibilities include deploying, monitoring, troubleshooting, patching, upgrading, hardening, and automating Kubernetes, Linux, Elasticsearch, Kafka, Redis, and related services. The role develops infrastructure automation, supports observability and platform security, manages scalable infrastructure, and contributes to documentation, Agile planning, design sessions, and bug triage. An active TS/SCI clearance and ability to obtain a CI polygraph are required.

Administer, design, develop, test, secure, patch, and implement Linux-based systems and workstations supporting Air Force Intelligence Operations. Build and modify Ansible playbooks, validate system changes, troubleshoot Linux environments, and contribute to automation, virtualization, cloud, monitoring, and secure access solutions. The role requires RHEL administration, PKI knowledge, networking and firewall familiarity, DoD certification, and a TS/SCI clearance with polygraph.

Administer and engineer Linux-based systems and workstations supporting Air Force Intelligence Operations. Responsibilities include designing, testing, validating, securing, patching, troubleshooting, and implementing RHEL solutions across global infrastructures. The role also supports automation, virtualization, cloud technologies, monitoring, networking, and secure access while translating customer mission needs into technical solutions.

Provides onsite administration and security operations for classified, air-gapped IT systems. Responsibilities include managing Linux and Windows servers, Active Directory, VMware, Veeam, Trellix ePO, Nessus, Splunk, and Lab-in-a-Box environments; performing hardening, vulnerability remediation, data spill response, secure sanitization, backup, monitoring, documentation, and STIG/RMF compliance. The role requires active Secret clearance, Security+ certification, classified-environment experience, and occasional after-hours support.

Administers classified Linux and Windows IT environments by installing, configuring, hardening, securing, monitoring, upgrading, and decommissioning servers, workstations, network equipment, and storage. Supports applications, incident response, vulnerability remediation, configuration management, and STIG/RMF compliance. The role includes on-site operations in Huntsville, off-shift work, on-call rotation, and occasional weekends. Candidates need a Secret clearance, eligibility for Top Secret, Linux administration experience, and the ability to obtain an IAT Level II or III certification.

Staff systems administrator responsible for Linux and Windows server administration, enterprise network engineering, infrastructure automation, security hardening, vulnerability remediation, and DoD compliance. Develops Ansible, Bash, PowerShell, and Python automation; manages Arista networking, storage, Active Directory, monitoring, and configuration management. Provides Tier 3 support, technical documentation, stakeholder communication, and knowledge transfer while maintaining resilient infrastructure for mission-critical workloads.

Administer Linux and Windows systems, virtual servers, workstations, laboratory environments, secure file transfer appliances, and computing resources. Responsibilities include patching, software packaging and deployment, PKI certificate management, account provisioning, hardware and software support, procurement, data migration, operating system installation, documentation, and compliance maintenance. The role also coordinates with network administrators and supports shared drives, scheduling resources, and isolated systems in a cybersecurity-focused environment.

Serve as a technical subject matter expert managing enterprise RHEL infrastructure for U.S. Army operations. Responsibilities include Linux server architecture, deployment, automation with Ansible and Bash, storage and network-share administration, middleware hosting support, STIG compliance, vulnerability remediation, identity integration, PKI authentication, monitoring, troubleshooting, and performance optimization. The role requires an active or interim Top Secret clearance and supports DEVCOM-CBC at Aberdeen Proving Ground.

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

Administer and maintain classified Linux networks and multi-user systems, including installation, patching, monitoring, backups, security auditing, configuration management, and troubleshooting. Coordinate across engineering, networking, cybersecurity, and customer teams; manage system documentation, testing, ticketing, and hardware or software recommendations. The role requires on-site work, occasional after-hours support, lifting equipment up to 50 pounds, and an active TS/SCI clearance with a recently adjudicated counterintelligence polygraph.

Manage Linux system deployment, patching, upgrades, software installation, configuration, monitoring, troubleshooting, and IAVA remediation. Configure AWS VPCs and virtual systems, support Elasticsearch, write Shell and Ansible or Salt scripts, maintain technical documentation, and create POA&Ms. The role requires extensive systems administration experience, customer support skills, networking knowledge, and active TS/SCI clearance with a current polygraph.

Administer, design, develop, test, secure, patch, and implement Linux-based systems and workstations supporting Air Force Intelligence Operations. Build and modify Ansible playbooks, validate system changes, manage RHEL environments, and develop automation, virtualization, and cloud solutions. Support real-time mission operations, system monitoring, PKI, networking, and secure access technologies while translating customer requirements into reliable technical solutions.

Administer classified Linux systems across multiple networks, including installation, patching, monitoring, backups, recovery, configuration management, documentation, security auditing, and troubleshooting. Collaborate with engineering, networking, desktop, cybersecurity, and project teams while supporting tickets, system releases, and customer requirements. The role is full-time onsite at Redstone Arsenal, requires a current Secret clearance and IAT Level II certification, and may involve after-hours work and lifting equipment.

Provides hands-on administration and support for Linux-based lab hardware, operating systems, applications, and networks. Responsibilities include installation, configuration, patching, backups, vulnerability scanning, DoD STIG application, Linux scripting, and Ansible automation. The administrator troubleshoots technical issues, maintains security and configuration compliance, and collaborates with engineering and administration teams. This is a full-time onsite position supporting an embedded lab environment at NAS Patuxent River.

Administer and support production Linux systems, primarily Ubuntu, while troubleshooting infrastructure, networking, virtualization, cloud environments, monitoring, logging, security, and system performance. The role also assesses software and embedded systems, identifies safety and mission-critical risks, validates requirements and testing procedures, documents findings, and presents results. Preferred experience includes Docker, Ansible, Terraform, AWS, Nginx, Grafana, ELK, Python, and high-availability infrastructure.

Leads enterprise Linux architecture, administration, and lifecycle activities for classified government systems. Designs high-availability, backup, disaster recovery, virtualization, containerization, networking, identity, and automation solutions. Directs major system enhancement projects, establishes technical standards, supports multiple networks, and resolves complex technical challenges independently. Provides mentorship and technical leadership while maintaining documentation, security, monitoring, and compliance practices. This is a full-time, on-site role requiring after-hours or weekend work as needed.

Administer, configure, monitor, troubleshoot, and automate Linux systems across multiple networks and architectures in a hybrid cloud environment. Deploy COTS and FOSS services, develop Bash and Python automation, use Puppet or Ansible, and collaborate with diverse teams to resolve infrastructure issues. AWS experience, including EC2 Auto Scaling, AWS CLI, and boto3, is desirable. The role requires an active TS/SCI with FSP clearance and substantial systems administration experience.

Administer and maintain UNIX/Linux systems, networks, and software in a DoD environment. Responsibilities include backup and recovery, software installation and configuration, security and library management, hardware installation, performance tuning, resource allocation, and troubleshooting across hardware, software, and network environments. The role requires TCP/IP and network security expertise, IAT Level II designation, and an active Top Secret T5 clearance.

Administer and support Linux systems across classified networks at an on-site government-contracting facility. Responsibilities include installation, patching, troubleshooting, configuration management, backup and recovery, file-system administration, security logging, audit support, testing, documentation, ticket resolution, and cross-disciplinary issue isolation. The role requires adherence to information-system security procedures, collaboration with engineering and support teams, occasional after-hours work, and handling equipment up to 50 pounds.

Administer classified Linux systems across multiple networks, including installation, patching, monitoring, configuration management, backups, recovery, security auditing, and troubleshooting. Collaborate with engineering, networking, cybersecurity, and end-user teams; maintain documentation, test releases, manage system images, and support ticketing processes. The role requires onsite work, an active Secret clearance, compliance with government security standards, occasional travel, and after-hours support as needed.

Administer and maintain Red Hat Linux infrastructure, including monitoring, user management, patching, upgrades, security hardening, performance tuning, backups, storage, and troubleshooting. Develop Ansible automation for configuration management and deployments, support users and application teams, monitor system health, resolve incidents, perform root cause analysis, and document operational procedures. The role supports an Army contract and requires an active Secret clearance.

Administers Oracle Linux systems, virtual machines, shared storage, identity and DNS services, and network infrastructure across classified and unclassified environments. Responsibilities include installation, patching, monitoring, troubleshooting, vulnerability remediation, Cisco network support, scripting, documentation, and maintaining service availability. The role requires an active TS/SCI clearance with polygraph, five or more years of systems administration experience, Linux and Cisco expertise, advanced scripting skills, and active CompTIA Security+ certification.