Top Systems Administrator Jobs

Administer and engineer large-scale Linux, Hadoop, and Accumulo distributed systems in a mission-critical cloud environment. Responsibilities include monitoring reliability, troubleshooting infrastructure, automating deployments, supporting Kubernetes workloads, managing Linux services and LDAP accounts, hardening systems, and contributing to architecture, incident response, and root cause analysis. The role requires after-hours on-call support and collaboration across infrastructure, networking, and security teams.

Manage and administer RHEL production systems in a classified operational support network. Responsibilities include system maintenance, monitoring, patching, hardening, performance tuning, storage allocation, security compliance, automation with Ansible, and patch management through Red Hat Satellite. The role supports high availability and scalability across cloud, on-premises, and lab environments, collaborates with engineering teams, and mentors junior and mid-level administrators.

Supports internal IT infrastructure and end users by administering accounts, identity and access systems, networks, endpoints, operating systems, collaboration platforms, security tools, backups, and asset inventory. Provides first- and second-level technical support, manages onboarding and offboarding, coordinates vendors, maintains documentation, and improves infrastructure, cybersecurity, automation, and operational efficiency.

Responsible for managing the Learning Management Systems (LMS) operations, user management, course management, troubleshooting, reporting, and training users in the use of LMS at the FTC.

Lead IT operations and end-user support: administer Entra ID/Azure AD, Microsoft 365, Intune and Jamf; manage onboarding/offboarding, device lifecycle, software deployment, patching, asset inventory, escalated troubleshooting, and office IT. Improve processes, documentation, and scalability while supporting cloud and on-prem environments for a growing defense/aerospace startup.

Provide systems and network administration for Army/DoD customers, including installing, configuring, and securing workstations, servers, and network devices; monitor performance and security; maintain documentation and web pages; train users; enforce IT policies and Cyber Workforce directives; and support large, multi-year program requirements.

As a Systems Administrator, you will manage IT systems, support users, ensure system security, and optimize infrastructure for clients' needs.

Serve as senior technical owner for enterprise infrastructure across compute, storage, identity, and cloud. Lead Tier-3 incident resolution and root-cause analysis, champion IaC and automation, administer Azure/Power Platform/Intune/Microsoft 365, partner with Security, support network tasks, author SOPs, and mentor junior admins to ensure production availability, performance, and security.

Provide on-site IT support and technical ownership for a facility: desktop support, infrastructure maintenance (servers, network, Wi‑Fi, security cameras), assist with projects (ERP, migrations, hardware refreshes), enforce security/compliance, maintain asset inventory, and provide occasional after-hours/on‑call support.

Senior SharePoint administrator responsible for deploying, operating, and maintaining enterprise SharePoint services across classified enclaves. Duties include troubleshooting, permissions and site management, migrations to SharePoint 2019/Online, SQL cluster and patch maintenance, PKI/claims-based auth, load balancer configuration, ITSM ticket handling, documentation, and 24/7 mission support with after-hours response.

Administer and improve Linux infrastructure supporting electronic warfare systems, including bare-metal servers, virtual machines, workstations, storage, networking, authentication, and production environments. Configure RHEL and Ubuntu systems, virtualization platforms, automation, containers, monitoring, logging, and security hardening. Troubleshoot complex infrastructure issues, remediate vulnerabilities, perform patching and upgrades, and improve reliability, scalability, performance, and fault tolerance across development, test, and production environments.

Designs, develops, tests, implements, and maintains Linux-based systems supporting Air Force Intelligence Operations. Responsibilities include Linux administration, security hardening, patching, troubleshooting, automation, virtualization, cloud implementation, system monitoring, and customer-focused solution development across global multi-infrastructure environments.

Manage and secure DoD RHEL and VMware environments on Dell enterprise hardware. Responsibilities include server and virtualization administration, HCI optimization, DISA STIG hardening, vulnerability remediation, secure networking, identity and access management, automation, and RMF documentation. The role requires extensive DoD system administration experience, security and platform certifications, and a Secret clearance.

Provide systems administration and end-user support for Linux and Windows environments, including Windows Server 2019, Active Directory, virtualization (VMware/Red Hat), deployment/patching, backups, hardware troubleshooting/reimaging, and security monitoring using tools like Ansible, SALT, Splunk, Puppet, SolarWinds, and Nessus. Must hold active TS/SCI with polygraph and be a US citizen.

Responsible for designing, implementing, and supporting the Operational Technology infrastructure, ensuring system stability, security, and overall performance management in coordination with application support teams.

Manage and maintain school IT infrastructure and cybersecurity; administer Google Workspace and Chromebooks; provide technical support and training to faculty, staff, and students; coordinate vendors and campus systems (security cameras, access controls, telephony, HVAC controls); oversee backups, licensing, inventories, purchasing, and long-range technology planning while supporting the school's mission.

Manage and secure Microsoft cloud and on-premises infrastructure (Azure, Entra ID, Intune, M365). Provide Level 1/2 user support, endpoint and Windows administration, backups, virtualization assistance, network troubleshooting, and participate in IT projects and documentation.

Support data center infrastructure and scientific computing systems: install and manage computer and storage hardware, assist with asset management and DCIM, participate in off-hours support, and help maintain operational readiness for large-scale HPC and data-processing environments.

Manage and support hybrid Windows, macOS, Android, and iOS infrastructure for 200+ users. Administer Windows Server/Active Directory, Google Workspace, MDM, Meraki networking, AWS cloud resources, security tools, and MS SQL. Lead a five-person help desk, oversee disaster recovery, automation, vendor management, and IT documentation while responding to incidents and improving processes.

Operate, maintain, and troubleshoot enterprise/DoD VoIP telephony systems (gateways, IP phones, PRI/FXO), perform installations and IMACs, collaborate with network managers, document configurations, and respond to service requests to ensure continuous voice service.

The Systems Administrator will manage and support HPC services, system operations, and IT problem resolution for the Intelligence Community, ensuring optimal system performance and user support.

As a Systems Administrator Level 1, you will provide HPC services, troubleshoot IT systems, and support computer/network security operations.

The Systems Administrator role involves Linux system administration, configuring servers, monitoring network resources, implementing security compliance, and documenting changes to inventory.

The Systems Administrator will manage HPC services, support system transition operations, perform troubleshooting and maintenance, manage IT system configurations, and assist users with IT systems.

The IT Engineer will provide Tier II support for maintaining a large enterprise environment, troubleshoot Windows and Linux applications, and manage user experience.