Top Systems Administrator Jobs

Administer and support IBM z/OS environments, including installations, upgrades, maintenance, lifecycle management, and complex troubleshooting. Use SMP/E for software maintenance, PTFs, APARs, and HOLDDATA processing. Develop REXX automation and administer z/OSMF services and workflows. Monitor performance, availability, capacity, and system health; support upgrades, migrations, disaster recovery testing, production operations, and on-call activities. Collaborate across infrastructure teams, maintain technical documentation, and mentor other mainframe administrators.

Administer and maintain Windows/Linux servers, AD, IAM, M365, Azure and AWS cloud services, virtualization, SAN/storage, SIEM, MDM, email gateways, backups and monitoring. Perform patching, troubleshooting, scripting/GPOs, documentation, security/compliance (CJIS), on-call rotation, ticket queue support, and participate in ISD projects.

Administer and maintain Nearmap's revenue tech stack (Salesforce, CPQ, NetSuite), build declarative automation, configure Conga CPQ, monitor integrations, support end users, run UAT, maintain documentation, and coordinate changes with global admins and engineering.

Install, configure, test, troubleshoot, secure, and support Windows-based applications (Microsoft Office, Java, Visual Studio, Raytheon EAGLE, SharePoint/Power Platform). Provide ticketing-system support to application owners and developers, implement DISA STIGS, perform upgrades/patching (may include occasional off-hours), and perform other assigned duties.

Administer and troubleshoot Windows Server 2012, SLES/RHEL Linux, and VMware ESX environments. Configure and maintain 1Gb/10Gb LANs and Layer 2/3 Ethernet devices. Support PC and server architecture, perform setup, configuration, and network troubleshooting. Collaborate with team; requires 3-5 years of applicable experience.

Lead systems administration across multiple classified networks: design, build, secure, and maintain Windows/Linux servers, virtualization (VMware), storage, networking, access management (AD/DNS), backups/disaster recovery, and configuration management. Provide technical leadership, troubleshooting, scripting automation (PowerShell/Unix Shell), STIG-based hardening, documentation, and customer briefings in SCI/SAP environments while holding active Top-Secret/SCI and meeting DoD certification requirements.

Administer and maintain Windows server environments, implement security standards (DISA STIGS/SCAP), manage AD/GPO, automate with PowerShell (and Python), support VMware and RDS, document procedures, and coordinate with network teams to ensure secure, continuous operation.

Lead configuration, administration, validation, and troubleshooting of automated control, server, and network systems for biopharma manufacturing and labs. Drive SAT/FAT and validation activities, author lifecycle documentation, manage vendor relationships, mentor staff, and support continuous improvement and regulatory compliance (cGMP/GAMP5).

Perform system administration and maintenance across multi-server environments: virtualization, patching, backups, security, monitoring, Active Directory, cloud migration, storage/disaster recovery, hardware installation/replacement, documentation, and infrastructure improvement projects supporting NASA operations.

Provide on-site Linux systems administration for classified government contracts including AWS resource management, STIG implementation, patching, backup/recovery, monitoring, incident resolution, documentation, audits, and ticketing (ServiceNow/JIRA). Support multi-network environments, work after hours/on-call, lift equipment, and maintain strict information system security and audit logging requirements.

Administer the Viewpoint Vista ERP environment, including users, permissions, configurations, performance, updates, data standards, reports, dashboards, and support. Partner with Finance, HR, Operations, and Project Management to improve workflows and data integrity. Provide Tier 1–3 user support, training, documentation, troubleshooting, testing, and system enhancement coordination across a multi-entity industrial services organization.

Provides Tier I and Tier II technical support while administering IT infrastructure. Responsibilities include troubleshooting hardware, software, network, and system issues; managing tickets and SLAs; supporting Windows endpoints and servers; administering Active Directory and Microsoft 365; maintaining networking, virtualization, backups, and endpoint deployments; coordinating hardware repairs; documenting systems; and tracking IT inventory.

Administers, implements, optimizes, and maintains enterprise infrastructure across on-premises and cloud environments. Manages Azure, Microsoft 365, Windows and Linux servers, identity services, storage, virtualization, backup and recovery platforms, and related enterprise systems. Leads troubleshooting, root-cause analysis, automation, security governance, capacity planning, patching, and infrastructure improvements. Supports ERP and integration platforms, collaborates with vendors and internal teams, documents complex system designs, and provides rotating after-hours support.

Administer and maintain network, server, identity, DNS, and security infrastructure supporting SCADA and industrial OT environments. Configure routers, switches, firewalls, Windows Server, Active Directory, and segmented networks; support field-device connectivity, monitoring, troubleshooting, disaster recovery, high availability, compliance documentation, and incident response. Participate in 24/7 on-call support and travel to treatment plants and pump stations for maintenance during approved change windows.

Administer and modernize cloud-based systems, endpoint management, identity and access controls, and security technologies. Provide Level 2 escalation support, investigate root causes, automate IT processes with PowerShell, maintain technical documentation, remediate vulnerabilities, and support technology deployments across branch locations. Participate in occasional travel and weekend on-call support.

Administers and troubleshoots THAAD hardware, software, networks, operating systems, and tactical components. Performs configuration, monitoring, IAVA updates, log analysis, backups, technical support, readiness activities, training exercises, and test events. Supports DoD Warfighters, rotating shifts, 24/7 operations, worldwide deployments, and austere field conditions. The role also requires maintaining deployment readiness and obtaining Security+, CDL, and AMMO certifications.

Senior Systems Administrator managing medium and small classified/unclassified networks. Duties include vulnerability scanning and remediation, patching, system monitoring, Active Directory and virtualization administration, backups/COOP, network device support, implementing NIST/FedRAMP controls, IT procurement/asset management, documentation, troubleshooting, and mentoring junior admins.

The Systems Administrator III will manage and optimize virtual infrastructure, ensure system performance, address failures, and support complex systems while collaborating with team members.

Provide Level 2 escalated support for campus wired and wireless networks, perform routine network hardware/software maintenance, troubleshoot connectivity issues, assist with network security and disaster recovery, maintain inventory and documentation, coordinate with vendors, and mentor Level 1 service desk staff.

As a Senior Systems Administrator, you will manage VMware environments, provide Windows Server and Linux support, deploy software, automate tasks, and mentor junior staff.

The LINUX System Administrator manages and supports high availability server/database/SAN platforms, ensuring 24x7x365 operation, monitoring, and documentation.

Responsible for complex installations, maintenance, and upgrades of computer hardware and software. Duties include administering UNIX & Linux OS, data backup and recovery, and ensuring network infrastructure integration.

The Systems Administrator will perform hardware and software installation, maintenance, data backup/recovery, and support Active Directory and MS Exchange, ensuring network infrastructure integration.

The UNIX Engineer administers systems and infrastructure, creates documentation, trains staff, and resolves technical issues for client environments.

The Systems Administrator role focuses on implementing and maintaining IT systems with an emphasis on automation, problem-solving, and support for mission users. Responsibilities include system configuration, operations monitoring, and troubleshooting.