Top Systems Administrator Jobs

Lead systems administrator responsible for implementing, maintaining, and securing Windows and Linux server environments, virtualization (VMware/Horizon), identity services (Microsoft Entra ID), backups/disaster recovery, endpoint management, scripting (PowerShell/Bash/Python), troubleshooting, compliance, and mentoring/site leadership. Provides Tier 1/2 escalation, supports hybrid cloud initiatives, and participates in after-hours maintenance and incident response.

Senior systems administrator responsible for installing, configuring, monitoring, and securing Windows and Linux servers, virtualization, backup/disaster recovery, cloud identity (Azure AD), automation with PowerShell/Bash/Python, endpoint management, and Tier 1/2 support. Mentor junior admins, maintain documentation, support audits and compliance, and participate in incident response and maintenance activities.

Lead administration and support of Windows and Linux enterprise infrastructure, including Active Directory, virtualization (VMware), identity (Azure AD), backup/DR, endpoint management, automation (PowerShell/Bash/Python), security patching, and Tier 1/2 escalation. Mentor junior admins, produce documentation, support hybrid cloud initiatives, and assist incident response and compliance activities.

Administer and maintain Windows and Linux servers, Active Directory, virtualization (VMware), identity services (Microsoft Entra ID/Azure AD), backups/disaster recovery, endpoint management, security patching, automation (PowerShell/Bash/Python), and provide Tier 1/2 escalation, mentoring, documentation, and cross-team collaboration to ensure availability and compliance.

Administer and troubleshoot Windows, Linux, and AWS cloud systems across multiple classification levels. Implement system configurations, security hardening, firewalls, file servers, monitoring systems, IAM policies, Active Directory, and Group Policy. Develop and modify Ansible automation for infrastructure and configuration as code, integrate platform capabilities, configure AMIs, and provide technical guidance and customer support. Sustain systems throughout the IT project lifecycle in a DevSecOps environment.

Administer and troubleshoot Windows, Linux, and AWS cloud environments across the IT lifecycle. Maintain secure production systems, harden configurations, manage Active Directory and Group Policy, configure IAM, and deploy infrastructure using Ansible and infrastructure as code. Support firewalls, file servers, monitoring tools, networking, cloud services, and software while providing technical guidance and documenting solutions. The role requires a TS/SCI clearance and collaborates with technical teams to deliver customer capabilities.

Administer and optimize Greenhouse, ModernLoop, and related recruiting systems. Configure workflows, permissions, templates, interview plans, integrations, and automations; maintain ATS data quality and reporting readiness; provide system support; coordinate with vendors and systems engineers; and document processes and training materials. The role also identifies AI-enabled automation opportunities to improve recruiting efficiency and accuracy.

Maintain and support SQL Server and PostgreSQL databases, Windows servers, virtualized VMware infrastructure, and enterprise storage systems. Responsibilities include database migrations, automated jobs, backups, archiving, patching, performance tuning, system configuration, outage resolution, troubleshooting, configuration management, ticket tracking, and technical guidance for Tier 1 and Tier 2 personnel. The role supports a cleared Distributed Ground System modernization environment at Langley AFB.

Designs, deploys, and supports mission-critical networking, servers, desktops, and applications across launch sites. Provides direct IT support during launch and test campaigns, performs upgrades and maintenance, monitors services, responds to incidents, and documents system architectures and procedures. The role contributes to automation and infrastructure-as-code initiatives while maintaining cybersecurity and industry compliance. It also supports real-time and operational technology environments, participates in on-call coverage, travels up to 20%, and may work at heights or at sea.

Provides onsite Linux and Windows systems administration for a federal customer, managing VMware virtualization, servers, storage, backups, replication, patching, monitoring, directory services, and disaster recovery. Supports infrastructure changes, incident response, root cause analysis, documentation, baseline images, and hardware/software deployments across approximately 200 servers. Participates in change boards, customer meetings, procurement research, and a rotating 24x7 on-call schedule. Requires strong virtualization, backup, storage, networking, AWS, Linux, and Windows experience.

Lead administration and technical ownership of SaaS and core business systems, including Google Workspace, Atlassian tools, ITSM platforms, APIs, and middleware. Architect integrations, automate onboarding and offboarding, manage identity and access, support compliance controls, and improve service delivery. Own IT-focused AI initiatives, mentor junior staff, lead projects, and serve as an escalation point between technical teams and business stakeholders.

Engineer, administer, optimize, and support enterprise SIEM platforms and security monitoring capabilities. Develop detection rules, automation, integrations, and response solutions; manage platform upgrades and patching; support cybersecurity incidents; collaborate with infrastructure, cloud, network, identity, operational technology, and application teams; maintain technical documentation; and participate in on-call support and cybersecurity technology projects.

Supports on-premises classified systems by administering Windows and Red Hat Linux servers, virtualization, storage, identity services, monitoring, backups, and documentation. Performs approved maintenance, patching, provisioning, troubleshooting, restoration testing, migrations, and continuity exercises under senior oversight. Responds to incidents, verifies system health, maintains technical records, and escalates complex issues. Coordinates with network, cybersecurity, application, and service desk teams to sustain mission operations.

Own endpoint, asset, and lifecycle management for the Boston office. Administer Jamf Pro, Jamf Connect, JumpCloud, and Apple Business Manager across macOS, Windows, Linux, and mobile devices. Provide troubleshooting, provisioning, onboarding, offboarding, ticket management, documentation, and user support. Identify recurring issues, automate processes, maintain compliance and asset records, and collaborate on IT projects and process improvements.

Own day-to-day IT support for the New York office as its sole on-site technical resource. Administer Google Workspace, user access, endpoints, Jamf, device lifecycle processes, office networking, AV, Zoom Rooms, and ticket resolution. Maintain documentation, troubleshoot recurring issues, coordinate escalations with global IT and vendors, and support onboarding, offboarding, office moves, and infrastructure improvements.

Administer and secure Microsoft identity, endpoint management, device compliance, and corporate infrastructure across hybrid office and lab locations. Manage Entra ID, Intune, Defender, Microsoft 365, MDM, servers, firewalls, VPNs, networks, and wireless systems. Support CMMC Level 2, NIST SP 800-171, and ITAR-aligned controls; monitor compliance, remediate drift, document systems, support audits, and lead incident response. Provide escalated end-user support, hardware provisioning, and onboarding/offboarding assistance as needed.

Administer and secure Linux RHEL and broader IT infrastructure, including servers, networks, firewalls, encryption devices, and container platforms. Build automation and CI/CD capabilities, perform patching and deployments, manage system lifecycles, document configurations, resolve Tier II issues, and support accreditation and security compliance. Coordinate risk management with IT leadership and Information Assurance, validate system performance, and provide guidance to junior staff.

Designs, deploys, secures, and administers corporate IT and microgrid OT infrastructure across cloud and on-premises environments. Responsibilities include identity and access management, systems and network administration, security compliance, cloud platforms, monitoring, backups, remote connectivity, and Tier 1–3 troubleshooting. Supports SCADA, PLCs, HMIs, and industrial protocols while maintaining IT/OT segmentation, documentation, audit readiness, and incident response. The role is based in Ridgewood, New Jersey, includes approximately 25% travel, and requires on-call participation.

Supports a federal client with endpoint management, software deployment, vulnerability remediation, patch compliance, and troubleshooting. Responsibilities include researching fixes, triaging failed installations, reviewing endpoint and security logs, conducting remote end-user support, manually repairing software, documenting resolutions, tracking remediation, and escalating recurring issues. The role requires active public trust or higher clearance and hybrid onsite work in Washington, DC.

Provides systems administration for geographically distributed server and network environments. Installs and maintains applications, server enclaves, operating systems, virtualized environments, and Active Directory. Performs patching, vulnerability management, certificate renewals, troubleshooting, backups, hardware deployment, and configuration management. Maintains technical documentation, resolves incidents, supports end users and technical teams, coordinates outages and upgrades, and recommends solutions to management.

Administer Atlassian Cloud (Jira, JSM, Confluence); design workflows, automations, and governance; develop REST API/webhook integrations; manage Atlassian Access (SSO/SCIM); build advanced JQL dashboards and reports; support cloud migrations, audits, and enterprise system integrations.

Administers the county’s enterprise network and server environment, including hardware and software installation, configuration, maintenance, monitoring, troubleshooting, patching, upgrades, backups, alerts, security controls, and disaster recovery planning. Creates technical documentation, evaluates technologies, and participates in an after-hours on-call rotation. The role requires hands-on systems and network administration, occasional emergency support, and independent resolution of complex technical issues.

Administer Abby Care’s identity, endpoint, access, and productivity systems across distributed teams. Responsibilities include managing Okta, Terraform-based RBAC, JAMF macOS deployments, SentinelOne security agents, Google Workspace, SaaS and hardware inventories, and Tier 2/3 technical escalations. The role also supports automation, compliance audits, security controls, documentation, troubleshooting, and access certifications for SOC 2 and ISO 27001.

Supports computer systems, networking infrastructure, cyber training environments, IT infrastructure, and range complex integration. Monitors system health, administers Windows and Linux servers, manages cloud, physical, and virtual network environments, and addresses vulnerabilities, attack vectors, and mitigation techniques. Supports cyber exercises, testing, training operations, and server virtualization using VMware, KVM, and Xen.

Administer and monitor Linux and cloud systems supporting DIB company vetting and onboarding. Perform remote Linux administration via SSH, install software using RPM and YUM, gather system status, and support Docker, Kubernetes, Helm, Ansible, CloudFormation, Terraform, and Traefik environments. The role requires managing large Hadoop clusters and maintaining an active TS/SCI clearance with Polygraph.