Top Systems Administrator Jobs

Design, implement, and operate Semtech's global network across 30+ sites. Support LAN/WAN, firewalls, SD-WAN, cloud networking (AWS/Azure), VPNs, automation, and lifecycle maintenance. Collaborate with infrastructure, security, and engineering teams to ensure network resilience, performance, and security while leading strategic initiatives like zero-trust and VPN modernization.

Lead systems administrator responsible for installation, configuration, maintenance, monitoring, troubleshooting, and security of servers, virtualization, storage, and network services. Provides third-tier support, disaster recovery, audits, policy recommendations, and may supervise other IT staff in a county law enforcement environment.

Provide on-site IT support for a Colorado office: deploy and administer Windows and Ubuntu desktops/servers and VMs, manage AD, networking, file storage, conferencing A/V, licensing inventory, ticketed user support, documentation, and suggest infrastructure improvements.

Provide advanced desktop, server, and network infrastructure support for managed services clients. Act as first escalation for technicians, deliver onsite and remote troubleshooting, document configurations, and recommend system improvements to enhance efficiency.

Provide advanced desktop, server, and network support for managed services clients. Serve as first escalation for technicians, perform onsite and remote troubleshooting, document configurations and procedures, evaluate system performance, and recommend improvements.

Monitor and analyze infrastructure health from a centralized Command Center; gather, elicit, and document user and business requirements; perform gap and workflow analysis; document interfaces and "as is"/"to be" processes; collaborate with developers to translate specifications and validate changes through testing; produce standard reports and maintain traceability.

Maintain and monitor LANs, data communications, operating systems, and physical/virtual servers. Ensure availability via monitoring, log review, backups, resource optimization, access control, software updates, virtualization/emulation support, troubleshooting, and documentation to support mission-critical infrastructure.

Manage and maintain SWIFT payment infrastructure: install and test payment systems and security software, resolve incidents and technical investigations, manage access control/IAM, perform daily operations and SWIFT compliance, prioritize Kanban backlog tasks, and coordinate remediation of risks and control deficiencies.

Support and maintain RHEL 7/8 systems for DoD HPC program; automate deployments with Bash, manage PostgreSQL, Apache and Tomcat, handle PKI/SSL, apply STIGs/RMF controls, patching, hardening, troubleshooting, and support testing and demonstrations.

The Systems Administrator manages IT systems infrastructure, providing implementation, troubleshooting, and maintenance support, ensuring operational efficiency and compliance with security standards.

Maintain and support UNIX mission servers (Solaris/Red Hat/Trusted Solaris), manage user accounts and policies, perform backups/recovery, apply OS and application patches, prepare systems for security accreditation, troubleshoot Tier 2 issues, implement scripts to automate tasks, and support security managers and government personnel with ISR applications like SecureView, UNICORN, ISSE Guard, IPL, and TMAN.

The Systems Administrator supports IRC's systems in Washington & Montana by providing technical support, staff training, troubleshooting, and system management.

The IT Systems Administrator II manages and optimizes the enterprise infrastructure, including Microsoft Azure, Hyper-V, and identity management systems, while supporting TrueCare's healthcare mission.

Provide on-site systems administration for Windows and Red Hat Enterprise Linux environments, managing DNS/DHCP/AD and server replication, troubleshooting complex hardware/OS integration issues, and supporting virtualization, storage, containerization, and CI/CD toolsets. Must hold an active transferable U.S. Secret clearance and obtain DoD 8140/8570 certification within six months.

Manage and secure Windows and Linux enterprise systems for classified DoD programs. Implement and maintain AD/LDAP, virtualization, storage, backups, automation, and troubleshooting. Collaborate with cybersecurity, produce documentation, meet DoD certification requirements, and support 24x7 operations with occasional travel.

Maintain and secure global IT infrastructure, provide 2nd/3rd-level support and on-call coverage, administer Azure/AWS, Active Directory/Entra ID, Microsoft 365, Nutanix, VMware and backups, lead patching and vulnerability remediation, manage deployments/migrations at branch locations, monitor systems, coordinate vendors, and follow project timelines to meet SLAs and security/compliance requirements.

Provide Tier 3 escalation support and systems administration for on-prem and hybrid environments. Install, provision, and maintain servers (OS, DB, apps), manage Active Directory and critical services HA, automate with PowerShell, support virtualization (VMware/Hyper-V), mentor junior staff, document solutions, and participate in on-call rotation.

This role is responsible for managing and optimizing system and storage components, ensuring installation and monitoring of infrastructure, and defining development roadmaps.

Administer and support ClearPath OS2200 environments including installation, configuration, upgrades, patching, monitoring, capacity planning, and lifecycle management. Troubleshoot performance issues, tune systems, manage storage/tape, workloads, databases, middleware and batch/transaction processing. Develop automation, runbooks, documentation, participate in on-call incident response, and follow ITIL change management. Support firmware/Plateau installations and SCMS II configuration, and collaborate with teams and customers for disaster recovery and continuous service improvement.

Provide day-to-day systems administration supporting user account provisioning and IAM (SailPoint), troubleshoot account and system issues, perform health checks and upgrades, maintain documentation in SharePoint, collaborate with security teams, and mentor Tier 1/2 support to ensure continuous DGS operations.

Perform Linux system administration, stand up and maintain servers, apply patches/upgrades to servers, VMs, and network devices, support security compliance controls, install/decommission hardware/software, integrate components with the network, and document inventory and configuration changes.

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.

Senior IT Systems Administrator providing escalated technical support and incident management for global internal users. Mentor service desk staff, manage endpoints via SCCM, Jamf, and Workspace ONE, and improve IT processes, policies, and application usability. Troubleshoot Mac, Windows, and Linux systems, coordinate cross-functional resolution, and support office-based technology needs as required.

JT4 is seeking Systems Administrators to install, configure, and maintain enterprise computer systems, manage networks, and ensure system security and performance while providing team support for operational tasks.

Assist in maintaining legacy applications and transitioning to a new system architecture, with a focus on DevOps practices.