Top IT Systems Administrator Jobs

Manage and support enterprise Windows and Linux server environments, Active Directory, virtualization (VMware), identity services (Azure AD), backup/recovery, endpoint management, and security. Troubleshoot escalations, automate tasks with scripting, support cloud/hybrid initiatives, and collaborate with IT teams for operational efficiency and compliance.

Administer and support IT systems in an automotive manufacturing environment, including MES and ERP administration, network and device monitoring, firewalls and cybersecurity systems. Manage Microsoft Active Directory, Cisco infrastructure, and VMware virtualization. Ensure reliable system operations and collaborate across teams to support production environments.

The Principal IT Systems Administrator oversees IT systems, leading complex initiatives, managing infrastructures and endpoints, enhancing security compliance, and ensuring incident management and documentation standards are met.

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 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.

Manage and secure classified IT infrastructure in closed areas: Active Directory, GPOs, DNS/DHCP, desktops and VMware/Hyper-V servers, backups, patching (STIGs/WSUS), logging and incident response. Collaborate with ISSOs for RMF/NIST/JSIG compliance, maintain documentation, support audits and accreditation, and provide onsite after-hours support as needed.

Senior systems administrator responsible for secure, classified IT environments: configure and maintain Lab-in-a-Box, VMware, backups, endpoint protection, vulnerability scanning, Active Directory/GPOs, Splunk logging, and ensure STIG/RMF/NISPOM compliance. Lead data spill response, system sanitization, documentation, and audit readiness while collaborating with security stakeholders in a 100% onsite classified area.

Provides onsite end-user IT support, troubleshooting hardware, software, networking, connectivity, and user access issues. Configures and deploys computers, mobile devices, peripherals, applications, updates, and security tools. Manages helpdesk tickets, Microsoft 365, Azure, Exchange Online, Windows environments, accounts, permissions, and documentation. Supports IT projects, installations, upgrades, process improvements, and cross-functional technical resolution. The contract lasts 3–6 months, with onsite work Monday through Thursday and remote work on Fridays.

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.

Administers enterprise Windows and Linux compute, storage, virtual desktop, Active Directory, backup, and replication infrastructure. Processes server build requests, supports development and certification clusters, manages SAN/NAS environments, and resolves escalated helpdesk issues. The role requires working across enterprise systems, responding to infrastructure needs, communicating effectively, and following laboratory safety and organizational policies.

Manage Othram’s Google Workspace and Apple Mac environment, Ubiquiti/UniFi network infrastructure, endpoint security, physical security systems, laboratory technology, and employee IT support. Responsibilities include device lifecycle management, onboarding and offboarding, access administration, troubleshooting, vendor and license management, documentation, network maintenance, and security response. The role requires hands-on onsite support in offices, laboratory areas, and network facilities, with careful adherence to forensic laboratory access, confidentiality, data integrity, and change-control requirements.

Provides Tier 1 and Tier 2 global employee IT support while administering macOS endpoints, identity platforms, SaaS applications, access workflows, and IT assets. Manages onboarding, offboarding, device lifecycle, office technology, vendors, security compliance evidence, and service improvements. Resolves complex issues, automates repetitive workflows, creates documentation, and leads assigned IT projects. Requires in-person attendance five days weekly at the Santa Clara office.

Provides Tier 1 and Tier 2 technical support for internal users and managed-services clients. Responsibilities include troubleshooting endpoints, Microsoft 365, identity systems, networks, servers, mobile devices, meeting-room technology, and building-related IT systems. The role manages tickets through resolution, monitors alerts, coordinates vendors and escalations, documents procedures, delivers customer service, and participates in on-call rotations.

Manage organizational IT systems and infrastructure, provide end-user support, troubleshoot Mac and Windows hardware and software, administer Okta, Google Workspace, and Microsoft 365, manage applications and licenses, support MDM and zero-touch deployment, maintain networks, and create user training and documentation.

Administer Epic’s corporate identity, access, endpoints, applications, devices, and employee IT support. Manage onboarding and offboarding, access reviews, authentication and device standards, MDM provisioning, asset inventories, procedures, and audit evidence. Support SOC 2 or similar compliance activities, security reviews, and incident response while partnering with infrastructure and people operations. This is a fully remote, US-based role supporting a global engineering team.

Administer Microsoft 365, Windows Server, Active Directory, Intune, Azure, networks, endpoints, and virtual servers. Provide hands-on end-user support, troubleshoot infrastructure issues, manage patching, backups, deployments, and security controls. Develop PowerShell scripts and Power Automate workflows, support cybersecurity and compliance initiatives, document procedures, and contribute to infrastructure and technology improvement projects.

Lead administration of Microsoft 365, Google Workspace, SaaS applications, Azure identity, and cloud infrastructure in a fully cloud-based organization. Provide Level 2/3 service desk escalation, execute migrations and cybersecurity projects, establish IT service processes, manage assets and vendors, and support onboarding, offboarding, incident response, change management, and M&A initiatives. The role partners with IT leadership and may help build and manage a growing internal technical team.

Administers, configures, secures, monitors, and supports the bank’s electronic banking systems and related IT environments. Manages user access, identity and access controls, security reporting, system troubleshooting, vendor relationships, and confidential information. Provides backup support to IT leadership, assists with daily technology operations, interprets security reports, and supports employees and customers with eBanking needs. Some local travel is required, including driving within a 70-mile radius.