Top Systems Administrator Jobs

Provides senior technical leadership for Windows and Linux system administration supporting government training systems. Responsibilities include advanced troubleshooting, virtualization administration, backup and restore operations, patching, maintenance, incident restoration, capacity planning, documentation, compliance evidence, and mentoring junior administrators. The role requires an active TS/SCI with polygraph clearance and DoD IAT Level II certification.

Manage classified, air-gapped IT systems and lab environments in a 100% onsite closed area. Configure Active Directory, GPOs, VMware, Veeam, Trellix ePO, Nessus, Splunk, and Lab-in-a-Box environments. Lead data spill response, secure wipes, vulnerability remediation, system monitoring, backup recovery, STIG/RMF compliance, documentation, and audit readiness while coordinating with security stakeholders.

Own the company’s identity, endpoint, and IT service management strategy. Administer Jira and Jira Service Management, Microsoft Entra, Jamf-managed macOS devices, Microsoft 365, Slack, and Confluence. Build access, device trust, onboarding, offboarding, automation, and email security workflows. Lead SaaS governance, endpoint security, troubleshooting, and internal tooling improvements while partnering cross-functionally in a hybrid Boston office environment.

Administer, secure, patch, and maintain enterprise Linux servers and virtual machines across on-premises and Azure environments. Automate operations with Bash and PowerShell, support Azure DevOps CI/CD pipelines and Docker workloads, manage identity integration, storage, filesystems, auditing, and security hardening. Collaborate with cybersecurity teams on compliance remediation and audit support while operating independently within a small cross-functional IT and security team.

Provides Tier III administration for mission-critical Linux and Windows infrastructure across multiple datacenters. Responsibilities include managing RHEL systems, Windows environments, VMware vSphere, Oracle appliances, DNS, user permissions, repositories, system performance, backups, logs, and Bash automation. The role also supports secure cloud and on-premises platforms, virtualization, containerization, Ansible automation, STIGs, RMF, and DoD cybersecurity standards while partnering with cybersecurity and engineering teams.

Leads IT operations and infrastructure administration, including technology implementations, vendor management, user support, cybersecurity compliance, system hardening, access governance, and technology roadmap execution. Manages Windows, Microsoft 365, networking, Active Directory, MDM, and SaaS environments; automates processes with Python and PowerShell; supports government cybersecurity frameworks; and leads IT personnel, initiatives, and service providers.

Administer endpoint security, patching, software deployment, Microsoft Intune, Windows systems, Active Directory, Entra ID, email accounts, and network environments supporting more than 1,000 users and endpoints. Monitor and remediate security threats, manage compliance and inventory, troubleshoot enrollment and device issues, build Windows images, produce operational reports, document procedures, and collaborate with IT teams to improve security and technology operations.

Administers enterprise Windows and Linux servers, virtualization, storage, backup, Active Directory, endpoint configuration, and privileged access systems. Performs patching, STIG/SCAP compliance scans, vulnerability remediation, RMF support, backup operations, and Tier II incident escalation. The role supports mission-critical DoD C4ISR operations and requires continuous operational readiness, active security clearance, and applicable DoD 8140.03 certifications.

Maintains and supports hybrid IT infrastructure across on-premises, AWS, and Azure environments. Monitors servers and networks, performs patches and upgrades, manages accounts and access, maintains backups, applies security controls, documents systems, troubleshoots hardware and software issues, and supports end users. Collaborates with helpdesk and senior administrators on infrastructure projects and escalates complex problems. Occasional after-hours or on-call work may be required.

Manage and administer systems in a Department of Defense environment. The role requires an active TS/SCI clearance, a bachelor’s degree with five years of relevant experience or equivalent education and experience, and a DOD 8570-compliant IAT Level II certification.

Administer and maintain network infrastructure, servers, connectivity, user accounts, Active Directory, permissions, backups, security controls, and monitoring systems. Troubleshoot network and server issues, support patching and recovery testing, maintain technical documentation, and collaborate with IT, security, applications, and vendors. The role includes hybrid office work and an on-call rotation covering evenings and weekends.

Supports AWS cloud security environments by designing, deploying, integrating, monitoring, and maintaining cloud infrastructure. Responsibilities include infrastructure-as-code development with CloudFormation, environment configuration, security remediation, automation, system integration, stakeholder requirement analysis, technical documentation, and maintaining secure production and development environments. The role is onsite in Bethesda, Maryland, requires an active TS/SCI clearance with polygraph, and may include occasional after-hours on-call support.

Administers Public Key Infrastructure systems in a Linux environment. Requires at least three years of systems or application administration experience, a Secret clearance, an IT-related bachelor’s degree or equivalent experience/vendor certification, and baseline IAT Level II certification such as Security+. Must obtain and maintain a Computing Environment certification within six months of starting.

Administer Microsoft 365, Entra ID, Intune, endpoint security, email security, backups, and enterprise identity systems. Provide hands-on, multi-site infrastructure support including rack-and-stack work, structured cabling, network deployment, hardware maintenance, workstation provisioning, Teams Rooms setup, and site documentation. Travel up to 50% for build-outs, refreshes, escalations, go-live support, and critical issues.

Administers and supports enterprise physical security systems, including Lenel OnGuard access control and Milestone XProtect video management. Develops SQL reports, dashboards, automations, and REST API integrations with HR, identity, ticketing, and workplace platforms. Troubleshoots security devices and networks, manages system updates and documentation, supports compliance and privacy governance, and coordinates projects with IT, security operations, vendors, integrators, and site leadership. This is a fully onsite Dallas role.

Provides network and computer systems administration for Air Force armament programs. Supports Tier I/II systems, classified and unclassified system imaging, patching, configuration, SharePoint, help desk operations, telecommunications, VTCs, mobile devices, cloud systems, equipment inventories, access permissions, and cyber liaison activities. Requires DoD or enterprise administration experience, secure systems support, cybersecurity compliance knowledge, and a Top Secret clearance. The role is onsite at Eglin AFB, Florida.

Supports secure and accredited DoD information systems for the AEWTTR program at China Lake. Responsibilities include assisting with RMF and system authorization activities, vulnerability assessment and remediation, STIG compliance, cybersecurity documentation, technical reporting, and stakeholder communication. The role operates onsite with government and contractor teams, requires independent work, and supports evolving mission priorities.

Administer and maintain global NetApp and Pure Storage arrays, including provisioning, capacity planning, performance tuning, upgrades, and security hardening. Manage Druva backup, retention, recovery, and troubleshooting operations. Support AWS storage services and SnapMirror replication across multi-region EDA infrastructure. Participate in migrations, hardware refreshes, and datacenter transitions while collaborating with systems, networking, security, and cloud teams to ensure resilient, secure, high-performing storage services.

Administer and optimize the company’s contract lifecycle management environment, including workflows, templates, permissions, repositories, reporting, integrations, and data governance. Provide user support and training, manage contract intake and routing, maintain accurate records, troubleshoot issues, support testing and system upgrades, and develop dashboards and documentation. Partner with Legal, IT, Procurement, Sales, Finance, and Operations to improve contract processes and deliver scalable system solutions.

Manage IT infrastructure and a hardware/software lab supporting secure environments. Responsibilities include system administration in Linux and Red Hat environments, account management, virtual lab management, monitoring, firmware upgrades, patching, antivirus and logging compliance, security auditing, and onboarding equipment through secure-environment approval processes. The role coordinates with supply chain, facilities, and security teams while maintaining compliance with cybersecurity policies and government standards.

Administer and troubleshoot Windows and Linux systems, workstations, servers, and network infrastructure. Provide escalated technical support, monitor performance, perform maintenance, backups, and recovery, and maintain cybersecurity compliance with DoD STIGs and RMF requirements. Document procedures and testing results, support ATO maintenance, and work with cybersecurity teams. The role requires occasional travel, non-duty-hour support, physical lifting, and eligibility for a DoD Secret clearance.

Administer identity and access systems, SaaS business applications, and employee onboarding and offboarding workflows. Configure SSO, MFA, SAML, OIDC, and SCIM integrations; manage access reviews, licenses, and security settings; build API and workflow automations; support macOS, Windows, and Linux users; document procedures; and collaborate with infrastructure, cybersecurity, and compliance teams.

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.