Top Systems Administrator Jobs

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.

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.

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

Administer Azure, Microsoft 365, Windows Server, identity services, Cisco Meraki networking, and multi-site branch infrastructure. Provide Tier 2 and Tier 3 troubleshooting, security and patching, monitoring, documentation, automation, vendor coordination, and infrastructure project ownership. Lead branch openings, relocations, expansions, closures, and technology refreshes while maintaining operational standards and managing changes through implementation and handoff.

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.

Lead systems administrator responsible for installing, configuring, patching, and maintaining Windows/Linux servers, SAN/NAS, VMware virtualization, Active Directory, and backup/DR (Veeam). Serves as technical lead and primary contact for infrastructure services supporting DoD/Army C4ISR, ensuring STIG-hardened environments, contingency mission-essential support, and enterprise tool management (SCCM, SolarWinds).

The Windows Systems Administrator will manage server builds, perform patching, troubleshoot issues, and maintain documentation while ensuring strong communication with users.

Administers hardware, operating systems, servers, network file systems, account services, workstation imaging, software deployment, security updates, backups, and disaster recovery for a film and video school. Provides technical support for classrooms, labs, and server infrastructure; monitors network performance; maintains documentation, inventories, and ticketing resources; troubleshoots hardware and software; coordinates with other administrators and central IT; and recommends system improvements.

Administer, modernize, secure, and integrate enterprise Splunk infrastructure and cybersecurity toolsets. Responsibilities include continuous monitoring, cyber defense, incident response, vulnerability and risk assessment, security architecture, systems integration, and ensuring secure, compliant, reliable, and scalable computing, network, and enclave environments. The engineer collaborates with government and contractor teams to strengthen enterprise security monitoring and mission effectiveness.

Manages IT operations across multiple sites, including employee onboarding and offboarding, hardware and software lifecycle management, SaaS administration, identity and access controls, endpoint support, inventory, and vendor coordination. Develops automation workflows, API integrations, scripts, dashboards, and lightweight internal tools while supporting security, compliance, documentation, site launches, and operational IT projects.

Manage and maintain enterprise IT infrastructure including Windows/Linux servers, Active Directory, Exchange/O365, virtualization, backups, and VPN/MDM. Perform patching, monitoring, Tier 2 troubleshooting, account provisioning, documentation, and support onboarding/offboarding. Assist with projects, ensure security policy compliance, and provide remote user support.

Administer and harden Windows Server environments across on-prem, VMware, and cloud (Azure/AWS/GCP). Manage AD/DNS/DHCP/Group Policy, automate with PowerShell and Ansible, monitor with Azure tools, remediate vulnerabilities, support migrations, provide Tier 3 and 24x7 operations, and document changes using ITSM and DevSecOps practices.

The CRM Systems Administrator manages CRM systems, supports users, develops workflows and automation, and ensures system improvements and documentation.

Support, maintain, and secure classified and unclassified enterprise systems. Install and manage physical and virtual infrastructure (VMware ESXi/vSphere/vCenter/Horizon), Nutanix/Dell storage, VDI and zero-client environments, build/deploy images, apply patches, perform backups/disaster recovery, and ensure cybersecurity compliance and accreditation.

Provides onsite systems administration across Red Hat Linux and Microsoft Windows environments. Manages servers, networking services, directories, virtualization, backups, storage, software installation, troubleshooting, and system integration. Collaborates with cybersecurity teams to maintain security requirements, documentation, and training. Supports 24/7 operations, develops technical solutions, and may work occasional extended hours. Requires U.S. citizenship, a Secret clearance or eligibility, Linux experience, and up to 10% domestic travel.

Administers enterprise Windows and Red Hat Linux systems across centralized and distributed environments. Manages VMware VxRail, ESXi, vCenter, vSAN, NAS/SAN storage, networking, backups, system upgrades, logs, and SQL-backed applications. Implements hardening, access control, patching, vulnerability management, and compliance procedures. Provides technical guidance, coordinates upgrades, supports mission-specific systems, and recommends infrastructure improvements. Requires U.S. citizenship and the ability to obtain and maintain a government security clearance.

Maintain and improve stable, secure systems; monitor servers and resources; resolve incidents; perform security audits, patching, upgrades, tuning, and optimization. Configure employee workstations, provide basic technical support, provision accounts, and manage Google Apps groups. Research automation opportunities and support scalable infrastructure, including occasional evening and weekend response.

The Systems Administrator provides Tier 1-3 support, manages Linux/UNIX systems, ensures data integrity, and oversees system upgrades and backups.

The Systems Administrator will support Military Support Programs by managing Linux and Windows systems, focusing on AWS integration and hardware infrastructure.