Top IT Systems Administrator Jobs

Maintains and supports operating systems, servers, virtualization environments, networks, and assigned applications. Responsibilities include system configuration, software and hardware upgrades, repairs, automation, security permissions, backup and SAN administration, desktop and helpdesk support, troubleshooting connectivity issues, and customer communication. The role also contributes to continuous improvement initiatives and may provide occasional travel support.

Maintain, configure, and secure enterprise and air-gapped systems onsite. Provide Tier II support, install and patch servers and desktops, manage virtual machines, administer Red Hat Linux, monitor systems, document procedures, escalate issues, and ensure compliance with DoD security standards and organizational policies.

Manage and evolve enterprise on-premises and Azure network infrastructure, including hybrid connectivity, routing, switching, firewalls, VPNs, DNS, DHCP, and identity-driven access. Respond to critical incidents through an on-call rotation, lead root-cause analysis, implement security hardening, support infrastructure projects, automate network operations, maintain documentation, and coordinate with vendors. Requires strong troubleshooting skills, Azure networking experience, and ownership of mission-critical systems.

Administer and support the Enrich fleet maintenance platform across configuration, user access, data quality, interfaces, troubleshooting, testing, releases, documentation, and training. Provide Tier 1 and Tier 2 support for related fleet systems, investigate issues across application and data layers, monitor integrations, reconcile records, and coordinate with business, IT, and vendor teams. Support process improvements, reporting, audit readiness, and critical incidents or deployments outside standard hours when necessary.

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.

Provides technical support and systems administration for Windows endpoints, field devices, servers, storage, virtualization, networking, cloud services, Microsoft 365, Azure, Active Directory, and Entra ID. Responsibilities include ticket resolution, infrastructure maintenance, patching, backups, disaster recovery, documentation, project support, vendor coordination, and incident response. The onsite role requires occasional after-hours support and travel to data centers, offices, and customer sites.

Administers and maintains the cooperative’s servers, network infrastructure, virtual environments, security tools, workstations, mobile devices, and Microsoft systems. Ensures IT stability, security, and availability; troubleshoots hardware and software; collaborates with departments and vendors; supports projects, cyber-security protocols, office technology, and system operations. The role requires independent judgment, strong communication, confidentiality, and limited overnight travel.

Own day-to-day operation, security, and reliability of a Windows-based hybrid-cloud environment across approximately 30 locations. Responsibilities include Active Directory and Entra ID administration, Microsoft 365, server and endpoint management, security hardening, networking, virtualization, patching, monitoring, PowerShell automation, backups, disaster recovery, documentation, change management, and escalation support.

Provides onsite systems administration and frontline technical support across desktop, server, cloud, network, mobile, printing, and physical security environments. Administers Azure, Entra ID, Windows Server, Active Directory, virtualization, patching, MDM, backups, and endpoint security. Troubleshoots user and infrastructure issues, maintains documentation, supports multiple locations, coordinates vendors, and participates in on-call and maintenance activities.

Administer and maintain IT systems, networks, servers, endpoints, and cloud environments. Troubleshoot user and infrastructure issues, manage patches, harden systems, monitor security alerts, and support vulnerability remediation. Assist with ISO 27001 compliance, audits, documentation, onboarding, and offboarding. Serve as an escalation point and technical mentor for junior staff while recommending improvements to IT reliability, security, and operational readiness.

Manage and secure classified closed-area IT infrastructure: Active Directory administration, desktop support, virtualization (VMware/Hyper-V), monthly patching and STIG compliance, DNS/DHCP and domain health, logging and incident response, documentation, change management, and support for RMF accreditation and audits in a Top Secret environment.

Manage and secure classified IT systems in closed areas: Active Directory user/group administration, desktop imaging and hardening, virtual server management, monthly OS/application patching per STIGs, DNS/DHCP/GPO maintenance, logging and incident response, RMF compliance support, documentation, and audit/accreditation activities.

Administer Windows and macOS systems, identity platforms, networks, endpoints, NAS storage, cloud services, and creative production infrastructure. Provide Tier 1 and Tier 2 support, manage onboarding and offboarding, troubleshoot Adobe and 3D production tools, maintain documentation and inventory, monitor system health, and support workstation, server, and software deployments. The role is fully onsite in Culver City, with occasional weekend maintenance and after-hours support responsibilities.

Provides Tier 2 technical support for internal users and managed services clients. Responsibilities include resolving escalated tickets, troubleshooting Windows, macOS, Microsoft 365, identity, networking, servers, mobile devices, meeting-room technology, and specialized IP-based systems. The role monitors alerts, coordinates vendors and escalations, maintains ticket documentation, contributes to knowledge resources, delivers customer service, and participates in on-call rotations.

Owns endpoint management and corporate IT products, designing and maintaining solutions that improve employee productivity and reduce risk. Responsibilities include support escalation, incident resolution, automation, access management, documentation, employee training, operational tooling security, and participation in IT projects and sprints. The role supports macOS, Ubuntu, Windows, SaaS applications, networking, and geographically distributed teams.

Owns the lifecycle, security, and administration of company devices, Mac MDM, user accounts, endpoint controls, networks, servers, backups, logging, and vulnerability remediation. Supports field deployments and customer-site infrastructure, maintains IT policies and documentation, coordinates shared services with parent-company IT, evaluates new tools, and communicates project risks and tradeoffs to leadership.

Provides advanced support and administration across enterprise applications, infrastructure, warehouse and retail technologies, SAP integrations, security systems, cloud tools, and legacy platforms. Troubleshoots complex cross-domain incidents, supports IT projects, maintains documentation, coordinates with technical and business teams, and serves as a subject-matter escalation point. The role also assists with IT strategy, operational oversight, system enhancements, testing, vendor coordination, and continuity of mission-critical systems.

Own and scale Harness’ corporate IT environment across identity and access management, SaaS applications, macOS and mobile device management, automation, endpoint security, networking, and infrastructure. Lead IT projects, provide Tier-3 troubleshooting, support incident response and root-cause analysis, maintain documentation, and participate in on-call coverage. The role supports over 1,000 users across multiple locations and requires independent systems ownership, automation expertise, and occasional office travel.

Maintain end-user devices, Windows Server, Azure, Microsoft 365, identity systems, networking, VoIP, backups, disaster recovery, patching, and endpoint security. Coordinate with external IT providers and vendors, support reporting tools, document procedures, troubleshoot issues end-to-end, and lead continuous improvement initiatives in an on-site environment.

Administer and secure hybrid IT infrastructure across SaaS, on-premises data centers, networks, identity systems, virtualization, storage, and security platforms. Serve as a Tier 2/3 escalation point, automate provisioning, manage backups and disaster recovery, maintain PKI and authentication, monitor systems, document processes, and support global hybrid-workforce users. The role requires systems administration, scripting, enterprise networking, Windows infrastructure, virtualization, identity management, and experience in regulated environments.

Administer and secure Microsoft identity, endpoint management, device compliance, and corporate infrastructure across hybrid office and lab locations. Manage Entra ID, Intune, Defender, Microsoft 365, MDM, servers, firewalls, VPNs, networks, and wireless systems. Support CMMC Level 2, NIST SP 800-171, and ITAR-aligned controls; monitor compliance, remediate drift, document systems, support audits, and lead incident response. Provide escalated end-user support, hardware provisioning, and onboarding/offboarding assistance as needed.

Administer and optimize Microsoft Intune, Windows Autopilot, device compliance, application deployments, security baselines, and endpoint security across Windows, macOS, iOS, and Android. Troubleshoot enrollment, policy, synchronization, and deployment issues; develop PowerShell automation; monitor compliance and reporting; and perform root-cause analysis. Collaborate with cybersecurity, infrastructure, identity, and application teams to support endpoint modernization, Zero Trust initiatives, and secure hybrid work.

Administer and improve global IT infrastructure across Windows Server, Active Directory, Microsoft 365, virtualization, networking, storage, backup, and disaster recovery environments. Support cybersecurity operations through vulnerability management, endpoint protection, identity security, incident response coordination, and security hardening. Monitor systems, troubleshoot issues, maintain documentation, develop PowerShell automation, support upgrades, and participate in on-call rotations and disaster recovery exercises.

Administer domain identity, endpoints, workstations, operating system deployments, patching, imaging, lab refreshes, printers, network-connected devices, ticketing, and inventory systems. Troubleshoot hardware and software during engineering integration and testing events, support cybersecurity compliance, document procedures, train technicians and lab users, and collaborate with multidisciplinary NASA engineering teams onsite at Johnson Space Center.

Installs, configures, monitors, secures, backs up, patches, and troubleshoots servers, systems, hardware, software, and infrastructure. Supports client requests, manages user accounts, maintains procedures and standards, performs performance tuning and capacity reporting, monitors data center equipment, handles recovery from failures, and participates in an on-call rotation. The role is fully on-site in Dunedin, Florida and emphasizes technical problem-solving and customer service.