Top Systems Administrator Jobs

Administer and troubleshoot Windows and Linux systems, workstations, network infrastructure, and virtual server platforms. Provide escalated technical support, monitor performance, perform maintenance, backups, and recovery operations, and document procedures and testing results. Collaborate with cybersecurity teams to apply DoD STIGs, manage vulnerabilities, respond to incidents, and maintain RMF authorization to operate. The role requires occasional travel, non-duty-hours and weekend support, physical lifting, and a DoD Secret clearance.

Lead Systems Administrator supporting mission-critical federal systems onsite in Annapolis Junction. Responsibilities include Windows server and workstation administration, virtualization, hardware and application support, system monitoring, troubleshooting, network and user administration, vulnerability patching, SQL Server and email service support, system recovery, customer issue resolution, and technical documentation. The role requires an active TS/SCI clearance and eligibility for a polygraph.

Administer and maintain enterprise Windows server infrastructure supporting U.S. Navy mission operations. Responsibilities include troubleshooting servers and applications, performance tuning, hardware upgrades, vulnerability remediation, SQL database administration, security configuration, documentation, and infrastructure improvements. The role requires maintaining resilient Windows environments and may involve travel to Navy commands within and outside the continental United States.

Administer project-level information systems, manage PMIS access permissions, verify data backup protocols, support cybersecurity compliance, coordinate with client IT teams, and maintain appropriate system access for project personnel across multiple projects. The role also involves troubleshooting, documentation, and supporting document management and project controls platforms.

Administers enterprise physical and virtual servers, Windows Server, VMware environments, storage, backup and recovery platforms, and infrastructure monitoring systems. Responsibilities include troubleshooting, patching, security hardening, capacity planning, disaster recovery, documentation, lifecycle management, change control, vendor coordination, infrastructure projects, incident escalation, and on-call support.

Manage and advance enterprise Windows endpoint management services across diverse systems and devices. Responsibilities include implementing, maintaining, modernizing, and retiring endpoint solutions; developing technology roadmaps; troubleshooting integrated systems; collaborating with IT, cybersecurity, service desk, scientific users, and leadership; and leading significant IT initiatives. The role requires Windows, Active Directory, SCCM, networking, virtualization, automation, scripting, and strong communication skills.

Manages and maintains IT environments for a high-visibility Navy program, ensuring availability, security compliance, and minimal downtime. Installs and updates operating systems and software, administers user accounts and permissions, implements security controls, and troubleshoots system and network issues. The role requires extensive Navy systems administration experience, Linux and virtualization expertise, cybersecurity knowledge, and work in classified environments.

Administers and supports systems, operating systems, applications, networks, and data-transfer environments. Responsibilities include installation and configuration, performance monitoring, troubleshooting, patching, documentation, inventory management, end-user technical support, escalation of complex issues, and backup and recovery operations. The role requires an active TS/SCI clearance with polygraph, Windows or Linux familiarity, networking knowledge, and DoD 8570 IAT Level 2 compliance.

Leads enterprise systems architecture, infrastructure modernization, automation, and highly available infrastructure operations. Drives Infrastructure as Code, configuration management, zero-trust implementation, disaster recovery, compliance automation, and cross-enclave interoperability. Provides strategic technical leadership for secure, scalable, resilient Windows, Linux, and hybrid-cloud environments while guiding teams on systems administration and infrastructure best practices.

Leads technical teams while administering Linux systems, monitoring mission performance, resolving complex server and software integration issues, and supporting secure enterprise information systems. Performs vulnerability and security-related assessments, collaborates with customers and partners, contributes to contract deliverables, and provides shift or weekend support as needed.

Manage, monitor, maintain, troubleshoot, and update Active Directory and hybrid authentication systems. Support identity, access, authentication, and centralized resource management platforms; resolve technical issues; use automation and orchestration tools; and help implement directory services technologies. The role is onsite in Washington, DC, requires U.S. citizenship, an active Top Secret clearance, SCI eligibility, and DoD 8140 IAT II compliance.

Administer identity, access, enterprise applications, and security systems across Entra ID, Active Directory, Microsoft 365, and Atlassian. Automate employee and service-account lifecycle processes using PowerShell and APIs, manage access reviews, respond to security events through Microsoft Sentinel, support integrations and application security reviews, resolve Jira-based requests, document procedures, and improve operational processes. The role is onsite in Seattle with one remote day weekly and may require after-hours incident response.

Provides advanced IT infrastructure and desktop support, including network administration, security operations, SIEM, workstation management, operating system patching, troubleshooting, asset management, and vendor coordination. The role supports audit and compliance, manages hardware and software lifecycles, documents incidents, and improves IT procedures. This hybrid position requires working from the Morristown, New Jersey office at least three days per week.

Administer and maintain Red Hat Enterprise Linux systems in a classified cloud-based infrastructure. Responsibilities include monitoring, patching, system configuration, hardening, troubleshooting, performance tuning, storage allocation, vulnerability remediation, documentation, and Tier 3 problem resolution. The role supports highly available mission-critical systems, collaborates with engineering teams and vendors, and may manage virtualization, containers, automation, high-availability clusters, load balancing, and failover systems.

Administers mission-critical Ground Support Stations in classified, on-site environments. Responsibilities include OS rebuilds, patching, account administration, DISA STIG hardening, network and hardware troubleshooting, media imaging and duplication, SHA-256 verification, NIST-compliant sanitization, field deployments, vendor coordination, documentation, and support for operational squadrons.

Administers Linux systems on classified government networks, maintaining multi-user environments, virtual machines, accounts, permissions, patching, monitoring, configuration management, security audits, and logging. Coordinates with engineering, networking, desktop, project management, customers, and IT teams. Requires RHEL server administration, VMware experience, active TS/SCI clearance with CI polygraph, and DoD 8570 IAT Level II certification or timely completion.

Administers County information systems and enterprise technology solutions. Installs, configures, monitors, troubleshoots, upgrades, and secures servers, networks, databases, software, hardware, and backup systems. Manages user accounts and access controls, resolves connectivity and system issues, supports technology implementations, documents configurations, trains users, and coordinates with vendors and departments on technology solutions.

Leads and supports hybrid cloud and on-premises infrastructure across AWS, Azure, Windows, networking, security, endpoints, and enterprise systems. Designs infrastructure, manages technical projects, troubleshoots complex issues, improves automation and monitoring, documents procedures, supports business-system integrations and EDI, and mentors support staff. Partners with leadership, stakeholders, vendors, and managed service providers to improve reliability, scalability, security, and operational efficiency.

Manage and support Linux desktops, servers, cloud infrastructure, Nutanix Cloud-in-a-Box environments, networks, hardware, and AWS resources. Configure and troubleshoot local and remote systems, switches, and cloud networks while using Puppet, Ansible, IPA, and DevOps practices. Maintain documentation and support infrastructure provisioning through automation and Infrastructure as Code. The role requires a TS/SCI with Polygraph clearance, DoD IAT Level II certification, a bachelor’s degree, and approximately seven years of Linux administration and network troubleshooting experience.

Provides enterprise systems administration for physical and virtual IT environments, including Active Directory, servers, storage, permissions, Group Policy, and VMware platforms. Troubleshoots complex hardware, software, database, access, and server issues; supports cybersecurity compliance, vulnerability remediation, infrastructure deployment, vendor coordination, documentation, and technical guidance. Collaborates with helpdesk, software development, quality assurance, cybersecurity, and project teams while maintaining enterprise systems and networks.

Provide on-site systems administration and data center support at NOAA’s Fairmont backup facility. Maintain Red Hat Linux and Windows systems, virtual machines, hypervisors, workstations, storage arrays, networks, and related equipment. Perform monitoring, maintenance, recovery, upgrades, installations, contingency exercises, documentation, and availability metrics reporting. Support antenna and network engineering teams, inventory and shipping activities, emergency responses, and occasional tower equipment servicing.

Maintains, secures, monitors, and troubleshoots Windows and Linux server environments, virtual infrastructure, hosted applications, accounts, and core services. Provides Tier-2 support, incident resolution, documentation, DoD compliance, STIG implementation, equipment lifecycle support, and customer briefings. Requires active Secret clearance, DoD IAT-II compliance, server administration certification, and 6+ years of systems administration or related IT operations experience. Supports occasional travel and 24/7 operations, including nights and weekends.

Administers Xflow, Concur, Tipalti, and SAP-connected P2P systems. Responsibilities include user provisioning, access controls, system monitoring, troubleshooting, integrations, compliance audits, configuration, UAT, documentation, master-data standardization, and process improvement. Partners with Accounts Payable, Procurement, IT, and vendors to resolve issues and implement reliable, secure technology solutions.

Administers and supports Windows desktops, servers, virtual environments, networks, VoIP systems, security tools, and business applications. Installs and upgrades hardware and software, applies patches, troubleshoots incidents, manages backups and disaster recovery, and provides escalated helpdesk support. Maintains documentation, performs root-cause analysis, supports infrastructure projects, and travels to branch locations as needed. Requires occasional off-hours support and physical ability to move equipment up to 75 pounds.

Provides first-level technical support, resolves and escalates customer issues, documents incidents, produces activity reports, and follows problems through closure. Investigates system issues independently and supports security compliance by assessing vulnerabilities, implementing controls, and reviewing security logs. The role also recommends process improvements and requires systems administration, help desk, and Jira experience.