Top Systems Administrator Jobs

Manage lifecycle of on-prem and cloud infrastructure including servers, Microsoft SQL databases, AD, DNS, SAN, backups, monitoring, and cloud accounts. Deploy, maintain, automate (PowerShell, Ansible, Terraform), support production/test environments, document systems, and assist with acquisitions and disaster recovery. Provide on-call support.

Diagnose and troubleshoot advanced server, networking, virtualization, email, and cloud services; manage escalations with internal teams and vendors; administer Windows Server, Active Directory, Group Policy, file services (DFS, Folder Redirection, OneDrive), DHCP/DNS, Exchange/O365 and Cisco networking; maintain Hyper-V/VMware hosts; automate tasks using PowerShell, batch, and Kaseya scripting.

Perform senior-level network and systems administration across Windows, Linux, and Mac platforms. Plan, implement, secure and monitor on-premise and cloud infrastructure; administer backups and disaster recovery; troubleshoot servers, networks, and applications; manage projects, vendor relationships, policies, and IT budgets; provide user support and documentation while maintaining compliance (PCI DSS) and security best practices.

Manage and secure hybrid Windows Server and Azure infrastructure. Duties include on-prem Windows administration, Azure resource deployment and hybrid integration, automation with PowerShell/ARM, monitoring, incident resolution, security and compliance, and supporting migrations and DR.

Support NERC CIP compliance and maintain Windows and Linux platforms for the Energy Management System (EMS). Perform configuration management, security controls testing, change control, disaster recovery, malware prevention, access control, and troubleshooting. Automate tasks, support audits and investigations, write technical/reference documentation, provide IT technical support, and assist CIP V5 implementation. Participate in on-call rotation.

The Systems Administrator will manage systems in Windows and Linux environments, configure cloud infrastructures, and ensure compliance with security standards.

Administer and secure network systems (workstations, file and web servers), install/configure hardware and software, monitor performance and security, enforce IT policies and Cyber WorkForce compliance, train users, and support DoD standard adherence for mission-critical Army programs.

Designs, implements, and supports enterprise Microsoft 365 environments. Leads architecture for Exchange, SharePoint, Teams, OneDrive, and Entra ID; manages tenant operations, identity/access, security/compliance, migrations, integrations, automation (PowerShell/Graph), governance, incident escalation, and technical documentation.

Maintain and secure Windows server and workstation environments, administer LAN and networking hardware, manage document/configuration management systems, design/maintain web pages, track hardware inventories, perform system upgrades, and support cybersecurity posture and operational readiness under minimal supervision.

Provide Tier II enterprise technical support for desktop, network, hardware, software, and cloud issues. Troubleshoot and resolve complex problems remotely across global sites, document incidents in ticketing systems, assist with maintenance and upgrades, mentor junior technicians, and maintain compliance with security procedures and policies. Active TS/SCI with full-scope polygraph required.

Provide technical support and troubleshooting for network, desktop, and systems hardware/software; deliver remote support using desktop mirroring and remote access tools; identify, investigate, resolve, and follow up on cloud infrastructure and helpdesk issues; coach and guide less-experienced staff.

Lead operations and technical team supporting a DoD enterprise Military Housing system: administer SAP BusinessObjects, monitoring (Dynatrace), Splunk, F5, virtualization/storage, backups, Oracle patching, STIG/ACAS remediation, certificate lifecycle, reporting, procurement tracking, and manage maintenance windows and DR exercises.

Maintains and supports operating systems, servers, virtualization environments, networks, and assigned applications. Responsibilities include system configuration, software and hardware upgrades, repairs, automation, security permissions, backup and SAN administration, desktop and helpdesk support, troubleshooting connectivity issues, and customer communication. The role also contributes to continuous improvement initiatives and may provide occasional travel support.

Manage and evolve enterprise on-premises and Azure network infrastructure, including hybrid connectivity, routing, switching, firewalls, VPNs, DNS, DHCP, and identity-driven access. Respond to critical incidents through an on-call rotation, lead root-cause analysis, implement security hardening, support infrastructure projects, automate network operations, maintain documentation, and coordinate with vendors. Requires strong troubleshooting skills, Azure networking experience, and ownership of mission-critical systems.

Administer Windows servers, workstations, Active Directory, VMware virtualization, networking, backups, security, and infrastructure systems for approximately 800 users. Troubleshoot hardware, software, connectivity, and end-user issues; manage accounts and permissions; monitor system health; document procedures; enforce IT standards; support infrastructure improvements; and help train future team members while developing toward leadership responsibilities.

Administer Windows servers, workstations, Active Directory, VMware virtualization, networking, backups, security, and infrastructure systems for approximately 800 users. Troubleshoot hardware, software, connectivity, and end-user issues; manage accounts and permissions; monitor infrastructure health; document systems; enforce IT standards; and support infrastructure improvements. The role is hands-on, with opportunities to mentor team members and develop toward broader leadership responsibilities.

The role involves designing, integrating, testing, and maintaining mission IT systems and supporting spacecraft operations. Responsibilities include requirement verification, user training, developing documentation, and ensuring system integration.

Provide systems administration for geographically distributed, air-gapped environments. Install and maintain applications, servers, desktops, storage, and network infrastructure; manage Active Directory, patching, certificates, vulnerability assessments, backups, virtualization, and security controls. Troubleshoot hardware and software issues, optimize performance, document complex environments, resolve outages, and support users, developers, testers, engineers, and external personnel. Occasional short-duration travel and the ability to lift up to 50 pounds are required.

Deploy and maintain AI enablement infrastructure (MCP servers, AI agents, AI features in SaaS), manage service accounts and API keys, automate and containerize services, support enterprise IT systems, document integrations and runbooks, and mentor IT support staff.

Administer, configure, maintain, and enhance the ServiceNow platform. Troubleshoot issues, implement upgrades, develop test plans, collect and analyze service data, maintain service catalog and reporting, and train end users to support IT Service Management.

Administer and engineer large-scale Linux, Hadoop, and Accumulo distributed systems in a mission-critical cloud environment. Responsibilities include monitoring reliability, troubleshooting infrastructure, automating deployments, supporting Kubernetes workloads, managing Linux services and LDAP accounts, hardening systems, and contributing to architecture, incident response, and root cause analysis. The role requires after-hours on-call support and collaboration across infrastructure, networking, and security teams.

Manage and administer RHEL production systems in a classified operational support network. Responsibilities include system maintenance, monitoring, patching, hardening, performance tuning, storage allocation, security compliance, automation with Ansible, and patch management through Red Hat Satellite. The role supports high availability and scalability across cloud, on-premises, and lab environments, collaborates with engineering teams, and mentors junior and mid-level administrators.

Supports internal IT infrastructure and end users by administering accounts, identity and access systems, networks, endpoints, operating systems, collaboration platforms, security tools, backups, and asset inventory. Provides first- and second-level technical support, manages onboarding and offboarding, coordinates vendors, maintains documentation, and improves infrastructure, cybersecurity, automation, and operational efficiency.

Responsible for managing the Learning Management Systems (LMS) operations, user management, course management, troubleshooting, reporting, and training users in the use of LMS at the FTC.

Lead IT operations and end-user support: administer Entra ID/Azure AD, Microsoft 365, Intune and Jamf; manage onboarding/offboarding, device lifecycle, software deployment, patching, asset inventory, escalated troubleshooting, and office IT. Improve processes, documentation, and scalability while supporting cloud and on-prem environments for a growing defense/aerospace startup.