Top Linux Systems Administrator Jobs

Maintain and optimize Linux infrastructure with DevSecOps practices, automate security controls and patch management, perform audits and vulnerability assessments, troubleshoot complex Linux issues, ensure RMF compliance, mentor junior staff, and recommend security and efficiency improvements.

As a Systems Administrator, you will manage classified IT systems, ensuring security compliance, desktop support, and server management while maintaining documentation and collaborating with security staff.

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

Remote Linux Systems Administrator to manage, harden, and optimize enterprise Linux servers (RHEL, Rocky, Ubuntu, Oracle). Implement secure architectures and Zero Trust controls, deploy authentication services (LDAP/AD/Kerberos/SSSD/MFA), apply DISA STIGs/CIS/NIST hardening, manage patching and lifecycle, and automate tasks using Bash, Python, or Ansible. Collaborate with security, network, and application teams supporting federal/regulated environments.

Manage and engineer enterprise Linux servers for NIH: install/configure RHEL/Ubuntu/Oracle/Rocky, perform DISA STIG/CIS hardening and patching, support CDM/continuous monitoring, automate admin tasks, integrate with identity services, handle vulnerability and configuration monitoring, and optimize performance across virtual and cloud environments.

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.

Provide hands-on administration and hardware support for Windows and Linux systems onsite at NAS Patuxent River. Maintain system compliance and security through patching, STIG application, scanning, backups, and troubleshooting. Administer Active Directory, collaborate with engineers, document changes, and follow established configuration and compliance processes.

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 and maintain Linux systems in cloud and containerized environments, troubleshoot systems, and ensure compliance with security standards and policies.

The Linux Systems Administrator will manage workstations and servers, interact with users, handle installations and maintenance, and assist in data center operations.

Lead Linux Systems Administrator managing RHEL environments and providing technical support for cybersecurity initiatives. Responsible for Ansible automation, Splunk monitoring, and overseeing lab operations.

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.

Lead and maintain a DevOps-oriented Linux environment supporting a government enclave: design and operate servers, VMs, network devices, NAS, VLANs/VPNs; manage security (RMF, IAVMs, McAfee, SELinux, FIPS), monitoring (OpenVAS, Prometheus, Grafana), migrations, documentation, and user-level support.

Provide Linux workstation and server administration in physical and virtual environments: onboard users, image/configure workstations, troubleshoot systems and networks, monitor performance, plan upgrades/outages, install data center equipment, document infrastructure changes, and provide HelpDesk and occasional after-hours support.

Provide principal-level Linux systems administration for classified government contracts: install, patch, monitor, troubleshoot, backup/recovery, configuration management, security logging, and documentation. Coordinate across teams, support multiple networks, use ticketing systems (ServiceNow/JIRA), and follow IS security guidelines. On-site work requiring TS/SCI with Polygraph and occasional travel.

The Linux Systems Administrator maintains Linux servers, manages system upgrades, monitors network environments, and develops automation scripts while ensuring system security and disaster recovery preparations.

Provide on-site Linux and HPC systems administration for a classified program: install/patch/monitor systems, manage backups, user accounts, security auditing, coordinate with engineering and vendors, recommend improvements, and support hardware diagnostics and repairs. Requires working under minimal direction, occasional after-hours support, and lifting equipment.

Administer, configure, and secure enterprise Red Hat/CentOS Linux servers supporting USCENTCOM. Manage services (Apache, Nginx, DNS, DHCP, LDAP), patching, performance tuning, SSL/TLS lifecycle, troubleshooting, documentation, and mentor junior staff while ensuring DoD security compliance and system availability.

Operate and maintain enterprise Linux and Windows systems, manage virtualization and monitoring tools, automate tasks with scripts and system automation, enforce security best practices, and support mission-critical government IT infrastructure with an active TS/SCI+Poly clearance.

Lead Linux systems administrator for classified government contracts. Manage multi-user servers and networks, implement patches/updates, design backup and disaster recovery, enforce security controls and STIG/RMF compliance, lead change management, mentor staff, coordinate with vendors, and serve as senior liaison for A&A and ISSM processes. On-site role with occasional travel and after-hours support.

Lead administration and lifecycle management of classified HPC Linux environments: monitor performance, optimize systems, integrate and support developers, ensure cybersecurity compliance (STIG/JSIG/RMF), manage backups/disaster recovery, and mentor teams while supporting classified program requirements and authorizations.

Maintain and secure classified Linux systems across multiple networks: install/patch/manage servers, implement STIGs, support backups/recovery, monitor and resolve issues, document processes, and support authorization and security auditing while coordinating with engineers and stakeholders.

Maintain and optimize production Linux servers for a DoD environment: install, configure, patch, harden to STIGs, automate with shell/Ansible, manage Red Hat Satellite, monitor performance, support containers/Kubernetes, and provide documentation and on-call support.

Lead design, maintenance, and O&M of a secure Linux-based enclave. Perform network administration, vulnerability remediation, RMF/SSP maintenance, monitoring (OpenVAS/Prometheus/Grafana), nginx deployment, SELinux/FIPS compliance, documentation, and developer/user support to ensure availability, reliability, and security of mission systems.

Administer and engineer Linux systems for a PeopleSoft implementation: install/configure PeopleSoft, apply patches, optimize performance, design and document system configurations, manage accounts, ensure government cybersecurity compliance, develop analytical procedures, and collaborate with cloud engineers, developers, and security analysts.