Top IT Systems Administrator Jobs

Administer secure and air-gapped enterprise systems, including installation, configuration, upgrades, patching, virtualization, Windows and Linux environments, monitoring, troubleshooting, documentation, and Tier II support. The role maintains compliance and security standards, supports users, resolves infrastructure issues, and escalates problems as needed. It is onsite in El Segundo, California, requires U.S. citizenship and the ability to obtain a Secret clearance, and may involve occasional travel.

Provide hands-on IT administration and white-glove support for Circle’s New York office and remote workforce. Maintain macOS devices, MDM, networks, security systems, conference rooms, and audio-visual equipment. Manage incidents, business continuity, disaster recovery, and security collaboration. Support executives, employees, events, and visiting customers while improving troubleshooting, documentation, and IT operations.

Administers classified, air-gapped IT systems in a 100% onsite environment. Responsibilities include managing Active Directory, Lab-in-a-Box environments, VMware, Veeam, Trellix ePO, Nessus, Splunk, domain controllers, secure wipes, data-spill response, vulnerability remediation, STIG and RMF compliance, documentation, and audit readiness. Provides coordination with security stakeholders and occasional after-hours or weekend maintenance and incident-response support.

Provides onsite administration and security support for classified, air-gapped IT systems and lab environments. Responsibilities include Active Directory, VMware, Veeam, Trellix, Nessus, Splunk, vulnerability remediation, backup and recovery, data-spill response, secure sanitization, STIG and RMF compliance, documentation, and audit readiness. The role requires collaboration with security stakeholders and occasional after-hours support.

Manage classified, air-gapped IT systems and lab environments in a 100% onsite closed area. Configure Active Directory, GPOs, VMware, Veeam, Trellix ePO, Nessus, Splunk, and Lab-in-a-Box environments. Lead data spill response, secure wipes, vulnerability remediation, system monitoring, backup recovery, STIG/RMF compliance, documentation, and audit readiness while coordinating with security stakeholders.

Support and maintain IT infrastructure, endpoints, operating systems, user accounts, virtual machines, and security tools. Responsibilities include onboarding and offboarding, patch management, vulnerability scanning and remediation, compliance tracking, scripting automation, server installation and decommissioning, rack organization, and cable management. The role requires Linux administration, Windows and Microsoft 365 management, virtualization, cloud familiarity, firewall knowledge, and hands-on data center experience.

Support SpaceX personnel and maintain Microsoft-based Windows infrastructure. Responsibilities include troubleshooting and recovering Windows systems, administering Active Directory and Entra ID users, supporting Microsoft 365 applications, implementing security policies, documenting standards, monitoring production environments, and remediating critical issues. The role may require extended hours and weekend work.

Supports SpaceX’s Windows infrastructure, users, productivity applications, and critical production resources. Responsibilities include troubleshooting and recovering Windows systems, administering Active Directory and Entra ID, implementing security policies, documenting standards, monitoring production environments, managing patches, and supporting Microsoft 365 applications. The role requires scripting experience and may involve extended hours or weekend work.

Design, administer, secure, automate, and maintain enterprise Linux infrastructure across physical, virtual, and cloud environments. Lead configuration management, patching, monitoring, storage, networking, identity integration, backup and disaster recovery, compliance, and vulnerability remediation. Serve as the escalation point for complex incidents, lead infrastructure migrations and site deployments, establish technical standards, mentor administrators, document systems, and contribute to infrastructure planning. Participate in on-call support and occasional maintenance windows.

Provides bilingual English/Spanish IT support across office and field operations. Responsibilities include deploying and tracking devices, administering Microsoft 365, managing user accounts, MFA and access, supporting Teams and conference room technology, documenting procedures, troubleshooting issues, and coordinating escalations and technology projects with a managed IT provider.

Designs, administers, secures, and operates Windows Server and Azure infrastructure in a defense environment. Owns Active Directory, Entra ID, cloud resources, patching, monitoring, backups, disaster recovery, automation, and security hardening. Leads infrastructure migrations and site deployments, resolves complex incidents, supports compliance requirements, mentors administrators, documents systems, and contributes to architecture and infrastructure planning. Participates in occasional after-hours maintenance and on-call support.

Provides site-level IT administration and support for ERP and business applications, user access, onboarding and offboarding, software rollouts, shop-floor networks, production equipment connectivity, hardware inventory, and ServiceNow tickets. Troubleshoots CNC, laser cutter, and press brake systems; coordinates with internal IT teams, vendors, OEMs, and integrators; follows backup, patching, security, and access-control procedures; and documents systems and recurring issues.

Provides hands-on employee IT support and systems administration across macOS, Linux, and Ubuntu environments. Responsibilities include device provisioning, troubleshooting hardware, software, accounts, printers, collaboration tools, conference-room technology, VoIP, and SCIF-related unclassified systems. The role also supports Linux workstations, on-premises servers, storage, lab equipment, patching coordination, access, monitoring, documentation, and issue escalation. Work is primarily on-site and involves coordination with users, vendors, and technical infrastructure teams.

Maintains and supports servers, network equipment, user devices, accounts, permissions, backups, patches, and security monitoring. Troubleshoots hardware, software, and network issues, provides employee technical support, documents systems and procedures, and travels regularly between Ponca City and Oklahoma City.

Administers end-user computing environments, identity and access systems, endpoint management platforms, ServiceNow ITSM, and IT asset lifecycles. Provides Tier 1–3 technical support, onboarding and offboarding, troubleshooting, patching, security compliance, email security, and isolated-environment support. Collaborates with infrastructure, networking, security, vendors, and corporate IT teams while developing training materials and improving operational processes.

Provides advanced IT support and systems administration across airport, restaurant, retail, and corporate locations. Troubleshoots POS, networking, endpoint, AV, digital signage, audio, and surveillance systems; administers user accounts and SaaS platforms; images and deploys laptops; assists with server patching and system rollouts; manages IT assets and inventory; documents recurring issues; supports technicians and provides help desk and after-hours coverage.

Administers and supports business applications, Microsoft 365, Apple devices, mobile technologies, warehouse systems, and company hardware. Provides troubleshooting, end-user training, asset management, cybersecurity monitoring, technical project support, system maintenance, documentation, and onsite or remote assistance across offices, warehouses, and distribution facilities.

Administers and supports physical and virtual servers, Microsoft 365, Windows workstations, backups, business applications, networking, security controls, and user access. Resolves system and hardware issues, manages tickets and documentation, supports retail point-of-sale technology, and assists with infrastructure improvements. The role is on-site in Wasilla, Alaska, includes occasional travel to stores, and may require after-hours outage response.

Serves as a senior technical owner for Atlassian applications and enterprise integrations. Designs and maintains REST, GraphQL, and webhook integrations; connects CRM, ERP, billing, SaaS, and internal systems; manages data transformation, synchronization, security, monitoring, and automation. Administers and upgrades Jira, Jira Service Management, and Confluence in clustered Linux environments, supports stakeholders, documents solutions, resolves issues, and mentors team members.

Administer and secure enterprise messaging and communications platforms, including Exchange Online, Microsoft 365, email gateways, Proofpoint, xMatters, and Kofax. Manage mail flow, mailboxes, email security, compliance controls, automation, licensing, upgrades, patching, troubleshooting, reporting, and incident response. Partner with cybersecurity, compliance, legal, HR, vendors, and business stakeholders while providing on-call support and serving as an escalation resource.

Manage and secure IT infrastructure, including networks, servers, software systems, workstations, accounts, and wireless networks. Troubleshoot hardware, software, connectivity, and outages; deploy updates; monitor performance; administer tickets; support cybersecurity initiatives and remote-work solutions. Develop documentation, procedures, training, and IT KPI tracking while coordinating issue resolution. Support manufacturing and engineering teams and maintain AS9100, NIST 800-171, and CMMC compliance.

Administer Azure/Entra ID, Intune, SSO integrations, endpoint security, asset and software lifecycles, and enterprise IT systems. Resolve escalated identity and device issues, improve IT operations, maintain documentation, support compliance and access governance, and automate provisioning, access changes, device actions, and reporting.

Maintain and troubleshoot Zoho, RingCentral, Doxy, and other IT systems; manage user onboarding and offboarding; update website content and chatbot functionality; monitor digital properties for security threats; resolve calendar synchronization issues; and support social media, review monitoring, surveys, and mass email campaigns.

Develops, manages, and controls corporate policies, procedures, manuals, and training materials. Ensures documentation meets regulatory and safety requirements, manages version control, supports audits, collaborates across departments, delivers training, and improves document-management processes. The role also requires compliance with mining safety procedures, potential vehicle operation, flexible scheduling, and maintaining confidentiality.

Provides Tier 1 and Tier 2 support for on-site and remote employees while administering Microsoft 365, Intune, Entra ID, SharePoint Online, and endpoint devices. Manages onboarding, offboarding, device inventory, access, compliance, and documentation. Supports Zero Trust, SOC 2 readiness, Copilot adoption, conference-room AV, and office technology. Coordinates with the managed services provider and vendors, resolves tickets through completion, and maintains Washington, DC office systems.