Top Systems Administrator Jobs

Provides enterprise patch management and vulnerability remediation across Microsoft, Azure, SCCM, and on-premises environments. Responsibilities include vulnerability assessments, patch deployment, configuration corrections, scanner remediation, compliance baseline management, reporting, 24/7 incident support, and technical training. Ensures remediation activities meet DoD RMF, IAV, STIG, and NIST requirements.

Manage infrastructure across Linux and Windows environments, including virtualization, containers, networking, hardware, firewalls, and system deployments. Harden systems using DISA STIGs, conduct vulnerability remediation, provide Tier 2/3 support, interface with government customers, and support field deployments at remote test sites. The role requires active Secret-or-higher clearance, DoD experience, systems administration expertise, and travel exceeding 25%.

Designs, deploys, maintains, and secures Windows-based customer systems supporting mission needs. Responsibilities include system administration, automation and scripting, Agile requirements and testing, documentation, troubleshooting complex systems issues, patch management, hardening, monitoring, and rotating between operations and DevOps functions. The role requires collaboration across teams and an active TS/SCI clearance with polygraph.

Administers and expands AWS, Azure, Microsoft 365, server, network, identity, and hybrid cloud environments. Manages infrastructure security, performance, availability, troubleshooting, firewalls, Azure DevOps repositories and CI/CD pipelines. Supports developers and IT staff, automates administrative tasks, coordinates vendors, documents root causes, and maintains compliance. This is a fully onsite senior role with flexible hours, after-hours, weekend, and on-call coverage.

Administer and troubleshoot client desktop, server, networking, virtualization, Microsoft 365, Azure, and cloud infrastructure environments. Resolve escalated technical issues, support security and backup solutions, maintain documentation, and contribute to process improvement. Mentor Systems Technicians, provide advanced customer support, assist with AI-enabled administration and productivity solutions, and participate in on-call coverage as needed.

Administer and support a large Cisco LAN/WAN and VoIP environment across multiple sites. Responsibilities include configuring Catalyst and Nexus switches, designing VLANs and subnets, managing routing protocols, troubleshooting connectivity and security issues, developing network dashboards and maps, supporting cloud connectivity, resolving VoIP problems, coordinating with vendors, and providing advanced technical support to technical and non-technical stakeholders.

Provides Tier 1 and Tier 2 technical support for veterinary hospitals and corporate users. Administers Microsoft 365, Entra ID, Exchange Online, Teams, SharePoint, OneDrive, and Intune. Supports Windows and macOS endpoints, networking, VPNs, infrastructure, specialized veterinary equipment, vendors, deployments, acquisitions, and cybersecurity initiatives. Maintains documentation, manages tickets, and delivers responsive customer service in a fully remote environment with occasional travel.

Administer and troubleshoot Windows Server infrastructure across classified and unclassified Navy networks. Manage Active Directory, DNS, DHCP, GPOs, virtualization, patching, hardening, vulnerability remediation, backups, and disaster recovery. Apply RMF, NIST, and DISA STIG controls; support ATO and POA&M documentation; automate tasks with PowerShell; and assist with incident response and change control. Provide escalation support to junior staff and support periodic field and at-sea operations on Kauai.

Provides entry-level administration and security hardening for Linux and Windows systems across classified and unclassified PMRF networks. Responsibilities include system deployment, patching, DISA STIG compliance, user and storage management, virtualization, troubleshooting, backups, configuration control, scripting, asset and license management, and technical reporting. The role supports mission environments, lab buildouts, hardware acquisition, customer collaboration, and system upgrades while requiring physical work in office, laboratory, field, and confined environments.

Administers RHEL and Linux environments across classified and unclassified Navy networks at PMRF. Responsibilities include security hardening, patching, vulnerability remediation, RMF and DISA STIG compliance, virtualization, automation, backup and disaster recovery, incident response, documentation, and audit readiness. The role supports live mission operations, periodic at-sea duties, and physically demanding field assignments. A Top Secret clearance, Linux or RHCSA certification, and DoD 8570.1M IAT Level II certification are required.

Oversee enterprise Windows infrastructure across classified and unclassified Navy networks. Administer Active Directory, DNS, DHCP, GPOs, virtualization, patching, imaging, backups, and system recovery. Implement RMF controls, DISA STIGs, vulnerability remediation, system hardening, and audit readiness. Develop PowerShell automation, maintain documentation and configuration baselines, support incident response, and mentor junior staff. The role requires collaboration with cybersecurity teams, participation in change and configuration boards, and eligibility for a Top Secret clearance.

Oversee enterprise Linux infrastructure supporting U.S. Navy operations across classified and unclassified networks. Administer RHEL systems, virtualization, patching, hardening, automation, vulnerability remediation, backups, and disaster recovery. Maintain RMF controls, DISA STIG compliance, ATO documentation, configuration baselines, and audit readiness. Support incident response and forensic recovery, participate in change and configuration boards, evaluate approved technologies, and mentor junior administrators. The role requires work in field and confined environments and eligibility for a Top Secret clearance.

Administers on-premises and cloud infrastructure, including Windows servers, VMware, AWS, networks, backups, Microsoft 365, identity systems, endpoints, and security platforms. Provides service desk and remote support, manages vendors and maintenance windows, deploys hardware, troubleshoots technical issues, maintains documentation, supports manufacturing sites, and participates in after-hours incident response. The role also leads technology implementations, user training, system lifecycle administration, and continuous improvement initiatives.

Lead day-to-day system administration for cloud and on-prem systems: install, configure, maintain, optimize, and secure servers and networks. Perform capacity and performance analysis, automate admin tasks, train staff, manage application networking and load balancing, and conduct vulnerability management while supporting CUI and government security requirements in a fully remote Agile environment.

Administer classified Windows, VMware, and Linux systems for a government contract. Responsibilities include system installation, patching, monitoring, configuration management, backup and recovery, account and access administration, troubleshooting, security auditing, documentation, and vendor coordination. The role requires onsite shift work, up to 25% travel, classified-environment compliance, and independent technical problem solving. Candidates must maintain Windows Server and domain architecture environments and hold an active Top Secret clearance with SCI eligibility.

Administer and secure enterprise IT and OT environments, including Windows, Linux, macOS, servers, workstations, virtualization platforms, and deployable assets. Conduct ACAS and Nessus vulnerability scans, apply DISA STIGs, manage patching and remediation, and support RMF and ATO documentation. Maintain system readiness, perform account and asset management, review logs, develop security architecture traceability, troubleshoot complex issues, and mentor junior staff in a DoD/Navy environment.

Administers Windows and Linux servers, networks, accounts, patches, and security configurations. Provides Tier 1/2 user support, troubleshoots infrastructure and VTC issues, monitors security logs, responds to incidents, manages backups, and tests disaster recovery plans. Requires DoD IAM Level III certification, U.S. citizenship, and the ability to obtain and maintain Top Secret/SCI access.

Administers Windows and Linux servers, networks, switches, routers, and firewalls. Provides Tier 1/2 user support, VTC troubleshooting, account management, patching, STIG implementation, security monitoring, incident response, backups, and disaster recovery testing. Maintains system documentation and supports reliable, secure IT infrastructure while escalating complex issues as needed.

Provides Level 2 managed services support for end users and customer IT departments. Responsibilities include administering Active Directory, Microsoft 365, VPNs, GPOs, VMware, servers, firewalls, Azure subscriptions, Exchange, wireless networks, MFA, SAN connectivity, backups, and replication. The role resolves service tickets, performs technical triage, documents work, communicates with customers, and installs technical equipment at customer sites.

Administer and optimize enterprise Windows and Linux infrastructure, virtualization, cloud platforms, networks, storage, security, endpoints, identity systems, and disaster recovery. Monitor performance, resolve infrastructure issues, maintain compliance controls, document systems, support technical escalations, and lead upgrades, migrations, and deployments. The role requires independent management of complex environments and strong communication with technical and non-technical stakeholders.

Administer and secure Windows, Linux, and macOS lab infrastructure supporting development and research environments. Responsibilities include system hardening, access administration, network configuration, virtualization, backups, troubleshooting, security documentation, compliance with NIST and CMMC standards, and lifecycle support. The role also maintains development infrastructure, performs hardware installation and inventory management, and supports air-gapped and corporate environments.

Administers and supports Windows desktops, laptops, servers, virtualized VMware and Citrix environments, storage, backups, and disaster recovery. Installs and patches systems, troubleshoots hardware and software, monitors infrastructure and environmental systems, maintains documentation, supports vendors, and serves as an escalation point for Helpdesk. Participates in projects, evaluations, preventative maintenance, and a 24/7 on-call rotation.

Manage and monitor classified information systems and networks, ensuring compliance with security policies and government regulations. Install and maintain secure hardware and software, conduct security assessments and audits, mitigate vulnerabilities, support incident investigations, and provide technical assistance and training to users. The role requires classified-systems administration experience, security certifications, strong analytical skills, and a Secret clearance.

Provides advanced administration and operational support for large-scale Linux systems and clusters. Responsibilities include installing and maintaining software, monitoring compute, network, memory, and storage components, troubleshooting Tier 1 and Tier 2 issues, configuring UNIX and Windows systems, managing virtualization and security, optimizing performance, and supporting system architecture. The role also requires scripting, automation, containerization, capacity planning, user assistance, and resolution of complex hardware, application, and integration problems.

Administer and maintain enterprise Windows and Linux systems, VMware virtualization, Active Directory, storage, cloud platforms, and endpoint infrastructure. Responsibilities include patching, troubleshooting, hardware installation, security hardening, vulnerability remediation, monitoring, and Tier-2 support. The role supports Azure, AWS, and GCP modernization initiatives while collaborating with senior engineers and cybersecurity teams.