Top Systems Administrator Jobs

Administer and optimize geographically distributed Linux and Microsoft server environments, including air-gapped enclaves. Responsibilities include system configuration, vulnerability assessment, patching, certificate renewal, Active Directory administration, security hardening, backup and restoration, troubleshooting, documentation, and stakeholder coordination. The role requires supporting technical teams, maintaining infrastructure reliability, and providing recommendations to management in high-assurance defense environments.

Administer and secure enterprise applications by installing, configuring, patching, tuning, upgrading, and troubleshooting systems. Harden applications against security policies and DISA STIGs, conduct vulnerability scans, remediate findings, support COTS applications, document technical procedures and designs, and collaborate with technical teams on operations and security initiatives.

Administers and optimizes Infor Lawson ERP environments supporting HR and payroll. Responsibilities include application and middleware server management, upgrades, patching, performance monitoring, backups, disaster recovery, access controls, LDAP and SSO integration, SQL-based data management, environment synchronization, Tier 2/3 support, documentation, and coordination with DBAs, functional leads, IAM teams, and Infor support.

Supports Microsoft Windows and VMware infrastructure across physical and virtual platforms. Responsibilities include installing, configuring, patching, monitoring, troubleshooting, securing, and maintaining servers and workstations; administering Active Directory and Group Policy; supporting engineering applications; managing backups, updates, scans, and remediation; and collaborating with internal customers, security, management, and cross-functional teams. The role is fully on-site and may require local travel between campuses or other locations.

Maintains multi-site physical and virtual server infrastructure, Windows and Linux systems, identity platforms, Microsoft 365, virtualization, backups, DNS, DHCP, and file services. Oversees monitoring, patching, vulnerability remediation, troubleshooting, documentation, system hardening, and infrastructure changes. Serves as the Level 2 escalation point, supports upgrades and deployments, coordinates vendors, and enables reliable IT operations within a manufacturing and engineering environment.

Manage and secure classified IT infrastructure in closed areas, including Active Directory administration, desktop and Windows endpoint support, VMware virtualization, patching and STIG compliance. Collaborate with ISSOs for RMF/NIST/JSIG adherence, maintain documentation and support accreditation, audits, logging, and incident response.

Senior Systems Administrator responsible for ServiceNow management, incident troubleshooting and escalation, server infrastructure deployment and maintenance, IT security compliance, documentation, project leadership, stakeholder and vendor coordination, and serving on weekly on-call rotation for the Merrimack production environment.

Own and operate Relativity's Linux and Windows infrastructure supporting manufacturing and engineering. Deploy, configure, automate, and maintain production systems on-prem and in cloud (Azure/GCP). Support AD, DNS, DHCP, enterprise backups (Veeam/Commvault/Rubrik), ensure uptime and AS9100 compliance, troubleshoot network/system boundaries, mentor junior admins, and collaborate with senior engineers to operationalize designs and automate administration.

The Red Switch Systems Administrator will maintain secure telecommunications systems, troubleshoot communication issues, manage work orders, and ensure compliance with standards for a government agency.

Supports Microsoft Windows and VMware infrastructure across physical and virtual environments. Responsibilities include installing, configuring, maintaining, patching, monitoring, troubleshooting, and securing workstations and servers; supporting engineering applications; administering Active Directory and group policies; resolving network connectivity issues; managing backups and security remediation; and using PowerShell for automation. The role requires on-site work five days per week and an active Secret clearance.

Designs, implements, and manages lab and classified IT infrastructure: Windows/Linux servers, VMware vSphere, NetApp storage, Exchange, WSUS, backups, PXE/WDS imaging, shell scripting, and RMF/audit documentation while collaborating with security stakeholders.

Support senior administrators in maintaining Linux and Windows systems in various environments. This role includes configuring storage, managing Active Directory, and script automation.

Lead administration and optimization of enterprise Windows, Linux, and macOS systems; design and support cloud, identity, endpoint, and collaboration platforms; automate operations; troubleshoot complex infrastructure issues; manage upgrades, asset lifecycle, incident response, and mentor junior admins. Participate in on-call rotation and cross-team projects.

Provide day-to-day enterprise end-user IT support and systems administration across Windows, macOS, and Linux. Deliver white-glove executive and meeting-support, manage user accounts via AD/Azure AD, maintain endpoint security and asset lifecycle, respond to incidents, document procedures, and collaborate with infrastructure, network, and security teams. Participate in on-call and occasional after-hours maintenance.

The Systems Administrator will support government missions by ensuring system operations, configurations, maintenance, and leading security protocols.

Support and administer enterprise systems and collaboration platforms, manage remote access solutions, troubleshoot user issues, and contribute to projects.

Manage and secure high-performance, air-gapped server and desktop environments. Configure and sustain Windows and Linux systems, virtualization, and Active Directory; perform vulnerability assessments, incident troubleshooting, and technical documentation to support critical defense missions.

Administer, configure, maintain, and support MBSE and requirements management platforms (Cameo, IBM DOORS). Serve as technical owner for application health, security, performance, upgrades, integrations, user support, documentation, process improvements, and vendor coordination while working with engineering, IT, cybersecurity, and development teams.

Administer, secure, and optimize enterprise AI tools and LLM platforms. Manage access, SSO integrations, usage policies, cost monitoring, audits, and SOC 2 readiness. Build automation scripts, train employees, and partner with IT, Security, and Business teams to enforce AI governance and data protection.

Lead and manage 24/7 technical support operations and a help desk team, ensuring timely resolution of IT issues and adherence to SLAs. Oversee system administration tasks including AD, virtualization, cloud services, network/email/firewall management, backup solutions, and possibly data center operations. Coordinate shift schedules and maintain ITSM processes.

The Principal Systems Administrator provides operational support for IT systems, focusing on maintenance, security, and troubleshooting of Windows and Linux environments. Responsibilities include system monitoring, root cause analysis, and technical guidance while collaborating with team members and stakeholders.

Provide on-site systems and desktop support for Windows and Linux environments, maintain virtualization and storage, run vulnerability/compliance scans and patching, manage Active Directory and network services, automate processes with PowerShell, produce SOPs/documentation, support production/dev labs, and follow DoD security guidelines while supporting customers and ticketing requests.

Owner of day-to-day administration and support of NetSuite and adjacent finance systems. Manage configurations, integrations, master data, SOX controls, incident triage, UAT, releases, and automation projects to improve finance processes and system reliability across a global multi-subsidiary environment.

Administer, configure, and maintain systems that log and monitor network threats. Design and implement security solutions, manage firewalls/IDS/IPS/VPNs, and perform security monitoring and incident response. Maintain network architecture per policy and support secure file transfer, encryption, and routing protocol implementations. Work may include flexible schedules and shift work.

Administer, support, maintain, and optimize enterprise UNIX systems (AIX, HP-UX, Solaris). Ensure reliability, performance, security, and compliance. Implement performance tuning, high-availability and disaster recovery solutions, and data migrations. Provide technical expertise and support flexible/shift schedules.