Top Linux Systems Administrator Jobs

Administer, configure, test, diagnose, and repair Linux servers and applications in a defense RDT&E environment. Automate administrative tasks with scripts, support directory services, storage, networking, and cybersecurity functions, and troubleshoot Cisco-based connectivity. Ensure servers and networks meet approved specifications for test and training events while adapting configurations to changing mission requirements and rotating work schedules.

Designs, deploys, and maintains Linux workstations and servers. Develops Puppet configuration management, creates Ubuntu imaging processes, resolves Tier 2 and Tier 3 technical issues, supports hardware and software developers, and assists with infrastructure automation using Terraform. The role also contributes to identity and access management, patching, system security, documentation, and scalable workstation and infrastructure operations.

Supports enterprise Linux systems by assisting with installation, configuration, patching, monitoring, incident management, compliance audits, vulnerability remediation, certificate deployment, and documentation. Works primarily with RHEL, Red Hat Satellite, Ansible, SolarWinds Orion, and Splunk. The role also supports FISMA and Critical Infrastructure Protection compliance in air-gapped environments and provides legacy application support.

Supports enterprise Linux systems by assisting with installation, configuration, patching, monitoring, incident management, compliance audits, vulnerability remediation, certificate deployment, and system documentation. Works primarily with RHEL, Red Hat Satellite, Ansible, SolarWinds Orion, and Splunk. The role also supports FISMA and Critical Infrastructure Protection compliance in air-gapped environments, legacy applications, and end-user systems. Candidates must be U.S. citizens, obtain Public Trust clearance, and may travel between customer sites.

Supports enterprise Linux systems through installation, configuration, patching, monitoring, incident management, compliance auditing, vulnerability remediation, certificate deployment, and documentation. Assists with RHEL, Red Hat Satellite, Ansible, IDM, MFA, SolarWinds Orion, and Splunk administration. The role also supports air-gapped critical infrastructure, legacy applications, FISMA compliance, and customer-site operations while working toward a Public Trust clearance.

Administer and secure enterprise Red Hat Linux infrastructure across physical and virtualized environments. Responsibilities include provisioning, patching, repository management, Ansible automation, DISA STIG compliance, vulnerability remediation, troubleshooting, monitoring, documentation, and technical support for defense modeling, simulation, and C4I exercise systems.

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

Provide onsite Linux system and network administration for NAVAIR systems at Patuxent River NAS: install, configure, monitor, troubleshoot, and maintain LAN/WAN, VMware, SAN, and related hardware/software. Implement backups, disaster recovery, and security measures (STIGs/ACAS), support users, and respond to outages. Work requires DoD security compliance and collaboration with program and technical teams.

Provides onsite administration of Linux hardware, operating systems, applications, and networked lab systems in a DoD embedded environment. Responsibilities include installation, configuration, patching, backups, vulnerability scanning, STIG compliance, shell scripting, Ansible automation, troubleshooting, documentation, and collaboration with engineering teams. The role requires Secret clearance, eligibility for Top Secret, three or more years of related experience, and proficiency with Linux administration, scripting, and Ansible.

Administer and optimize enterprise Linux server environments supporting classified intelligence systems. Responsibilities include monitoring, troubleshooting, patching, STIG hardening, vulnerability remediation, performance tuning, VMware and storage support, cluster services, security tool maintenance, firewall and IDS/IPS configuration, and NetApp administration. The role requires collaboration with engineering, cybersecurity, and operations teams in a mission-critical environment.

Administers Red Hat Enterprise Linux infrastructure, including installation, monitoring, tuning, troubleshooting, patching, virtualization, and containerization. Develops and maintains Puppet manifests, modules, infrastructure-as-code scripts, and automation workflows. Supports server provisioning, outage resolution, documentation, and team training. The role requires an active TS/SCI clearance, onsite work at Langley AFB, Security+ certification, and willingness to provide up to 10% continental U.S. travel, potentially in a 24/7 shift environment.

Provides Linux and Windows system administration, infrastructure maintenance, troubleshooting, networking, virtualization, patching, system hardening, security tooling support, and classified-space infrastructure operations. Responsibilities include configuring hardware and software, maintaining system images, supporting remote access and compute/storage platforms, documenting procedures, implementing physical controls, and assisting with audits and system sanitization.

Administer and secure Linux and Windows infrastructure in classified and unclassified environments. Build system images, automate provisioning and compliance, troubleshoot compute, network, storage, and virtualization platforms, and support Cisco ACI fabrics. Manage backups, physical infrastructure, incident response, and security baselines while coordinating with customers and subcontractors. The role requires active TS/SCI clearance with polygraph and full-time onsite work near College Park, Maryland.

Manage classified, air-gapped Windows and Linux systems in closed-area lab environments. Responsibilities include Active Directory, GPO, domain controller, VMware, Veeam, Trellix ePO, Nessus, Splunk, vulnerability remediation, data spill response, secure sanitization, STIG and RMF compliance, documentation, and audit readiness. The role is fully onsite, supports classified mission environments, and requires occasional after-hours or weekend maintenance and incident response.

Provides onsite Linux and Windows systems administration for a federal customer, managing VMware virtualization, servers, storage, backups, replication, patching, monitoring, directory services, and disaster recovery. Supports infrastructure changes, incident response, root cause analysis, documentation, baseline images, and hardware/software deployments across approximately 200 servers. Participates in change boards, customer meetings, procurement research, and a rotating 24x7 on-call schedule. Requires strong virtualization, backup, storage, networking, AWS, Linux, and Windows experience.

Administer, maintain, monitor, troubleshoot, and secure Linux-based systems across classified and unclassified research environments. Responsibilities include server, workstation, storage, networking, user access, patching, backups, performance monitoring, Tier 1/2 support, scripting automation, documentation, and vulnerability remediation. The role also supports mixed Windows environments and coordinates issue resolution with customers, researchers, engineers, subcontractors, and internal teams.

Manage and secure Linux servers and desktops in classified environments. Responsibilities include continuous vulnerability monitoring with Nessus, remediation through patches and configuration changes, STIG and RMF compliance, networking services, user access, system hardening, performance monitoring, backups, documentation, auditing, and collaboration with cybersecurity, network, and application teams.

Administer and support production Linux systems, primarily Ubuntu, while troubleshooting infrastructure, networking, virtualization, cloud environments, monitoring, logging, security, and performance issues. Assess systems and embedded software, analyze code and interfaces, identify safety and mission-critical risks, validate requirements and testing procedures, document findings, and present results. The role requires an active Top Secret clearance, SCI eligibility, U.S. citizenship, and potential polygraph eligibility.

Administer and optimize enterprise Solaris and Linux systems, storage, backup, patching, package management, vulnerability remediation, hardening, and compliance processes. Configure IBM Enterprise Storage and Veritas NetBackup, manage Nessus scans, troubleshoot performance issues, support infrastructure upgrades and incident response, and maintain technical documentation. Requires active TS/SCI with Polygraph clearance, Security+ certification, and at least three years of Solaris and Linux systems administration experience.

Administer and engineer Oracle Linux systems and Oracle Exadata environments supporting an information technology enterprise. Maintain secure systems, document and track work in Confluence, handle sensitive data, support mission outcomes, and cross-train or backfill teammates. The role requires onsite support in Chantilly, Virginia, U.S. citizenship, and an active TS/SCI clearance with polygraph.

Provides Tier III administration for mission-critical Linux and Windows infrastructure across multiple datacenters. Responsibilities include managing RHEL systems, Windows environments, VMware vSphere, Oracle appliances, DNS, user permissions, repositories, system performance, backups, logs, and Bash automation. The role also supports secure cloud and on-premises platforms, virtualization, containerization, Ansible automation, STIGs, RMF, and DoD cybersecurity standards while partnering with cybersecurity and engineering teams.

Administer and maintain Red Hat Enterprise Linux systems in a classified cloud-based infrastructure. Responsibilities include monitoring, patching, system configuration, hardening, troubleshooting, performance tuning, storage allocation, vulnerability remediation, documentation, and Tier 3 problem resolution. The role supports highly available mission-critical systems, collaborates with engineering teams and vendors, and may manage virtualization, containers, automation, high-availability clusters, load balancing, and failover systems.

Manage and support Linux desktops, servers, cloud infrastructure, Nutanix Cloud-in-a-Box environments, networks, hardware, and AWS resources. Configure and troubleshoot local and remote systems, switches, and cloud networks while using Puppet, Ansible, IPA, and DevOps practices. Maintain documentation and support infrastructure provisioning through automation and Infrastructure as Code. The role requires a TS/SCI with Polygraph clearance, DoD IAT Level II certification, a bachelor’s degree, and approximately seven years of Linux administration and network troubleshooting experience.

Provides onsite systems administration across Red Hat Linux and Microsoft Windows environments. Manages servers, networking services, directories, virtualization, backups, storage, software installation, troubleshooting, and system integration. Collaborates with cybersecurity teams to maintain security requirements, documentation, and training. Supports 24/7 operations, develops technical solutions, and may work occasional extended hours. Requires U.S. citizenship, a Secret clearance or eligibility, Linux experience, and up to 10% domestic travel.

Provides administration and sustainment for large-scale Linux systems, including software installation, configuration, monitoring, troubleshooting, security compliance, and infrastructure optimization. Supports compute, networking, memory, storage, virtualization, automation, containers, and distributed filesystems. Uses Bash and Python scripting, Red Hat Satellite, Splunk, VMware ESXi, SaltStack, Ansible, Docker, and monitoring tools. Kubernetes, additional distributed filesystems, and Atlassian tools are preferred. Requires extensive systems administration experience, Security+ certification, and an active Top Secret/SCI clearance with polygraph.