Top Systems Administrator Jobs

Administer and maintain SharePoint Online and Microsoft 365 collaboration services. Manage security groups, sharing policies, and governance. Administer Microsoft Purview for classification, sensitivity labels, DLP, retention, and compliance alerts. Monitor data protection events and audit logs, coordinate remediation, conduct permissions and compliance audits, provide Tier 2/3 support, develop governance documentation and training, and support platform upgrades, migrations, and performance monitoring.

Lead systems engineering activities for Navy Training Command, overseeing simulations, requirements analysis, technical documentation, and multi-site operations.

The Systems Administrator supports IT systems by managing configurations, troubleshooting, and providing Help Desk services while ensuring system performance.

The Systems Administrator will support operations and technology challenges, manage incidents, document practices, and oversee Microsoft and cloud infrastructure.

Support and administer mission-critical systems in a secure, onsite environment. Manage cloud infrastructure (AWS), Kubernetes, CI/CD pipelines, Linux systems, and automation. Collaborate with cross-functional teams, maintain security controls, and meet clearance and onsite requirements.

Provide monitoring, maintenance, installation, upgrades, and end-user support for Windows Domain servers and related infrastructure. Manage AD, GPOs, backups, Office 365/Exchange tenant, MDM, mail flow, certificates, phone systems, scripting/automation, and hardware/software recovery. Complete projects for Windows and Linux systems, use helpdesk ticketing, and perform quarterly access/compliance reviews.

The Systems Administrator will manage and secure Windows systems, ensure compliance with security standards, perform log analysis, and maintain Active Directory.

Support, configure, and maintain business systems; gather and document requirements; design workflows and process documentation; manage system changes, testing, deployments, and user support; administer user access/security and collaborate across stakeholders to improve operational effectiveness.

The role requires advanced skills in systems administration and technical support for mainframe operations, including expertise in storage management and monitoring systems.

Administer and configure system platforms, provide technical support and troubleshooting, gather requirements, design/test/implement IT solutions, analyze and resolve integration and data issues, create reports and dashboards, develop training and governance, prioritize enhancements with stakeholders, and support cross-functional users and business operations.

Maintain and secure Windows and Linux servers/workstations, manage Active Directory/GPO, TrueNAS, PostgreSQL, and Remote Desktop Services. Provide first- and second-line helpdesk support, implement monitoring and backups, harden systems, automate tasks with scripting, document procedures, and participate in on-call/out-of-hours operations.

Administer, configure, monitor, and troubleshoot enterprise Unified Communications platforms (Avaya, Cisco, Teams). Ensure SLA compliance, support Microsoft Teams migration, analyze performance metrics, coordinate vendors, maintain documentation, and uphold security and operational requirements.

Senior Systems Administrator responsible for configuring, maintaining, and troubleshooting UNIX/Windows servers, network/storage, and application infrastructure supporting intelligence analysis. Provide Tier 1/2 support, capacity planning, system integration, and DevSecOps toolchain administration (CI/CD, SCM, artifact repos). Design and implement system architectures, optimize operations, and support migrations and new technology integrations in a classified environment.

Install, configure, and support Epic client applications (Hyperspace, Interconnect, print services) across desktops, mobile, and virtual platforms. Monitor performance and security, troubleshoot issues, support Citrix/VMware environments, manage upgrades/patches, document configurations, participate in disaster recovery testing, and provide on-call production support while ensuring compliance with policies and standards.

Operate, monitor, secure, and maintain enterprise Linux (RHEL) systems across on‑prem, virtual, and cloud (AWS/GCP) environments. Perform updates, patching, performance tuning, troubleshooting, backups, security hardening, automation (Bash/Python/Ansible), application support, documentation, help-desk triage, and participate in on-call rotations to ensure availability and compliance for a mission-critical geospatial application.

Operate and maintain a virtualized data center (VMware, Dell/EMC); administer Windows servers and Active Directory; perform patch management, backups, troubleshooting, system analysis, documentation, and mentor Tier 1/2 personnel while partnering on security and compliance.

Manage, troubleshoot, and maintain Windows and Linux systems; implement security measures, perform updates/patches/backups, manage user accounts and permissions, conduct audits, collaborate with network/application teams, and provide technical support in a mission-critical DoD environment.

Design, implement, and maintain enterprise network and server infrastructure. Configure, monitor, and troubleshoot routers, switches, firewalls, and VPNs. Manage performance, capacity planning, QoS, firmware/patching, vulnerability remediation, and STIG/IDS/IPS security. Support disaster recovery, business continuity, and document network architecture and change management.

Administer and maintain a mission-critical physical and virtual network enclave: install and configure network equipment and firewalls, perform patches, backups, vulnerability scanning, data management/transfers, troubleshoot connectivity, and ensure compliance and security. Must obtain DoD 8570 IAT Level II within six months and hold TS/SCI with polygraph.

Provide day-to-day datacenter IT infrastructure administration for a 24x7 utility: Windows server and Active Directory administration, Azure/Entra/Exchange management, virtualization and backup administration, security and patching, certificate authority and vulnerability remediation, monitoring, hardware/server deployment, automation/scripting, documentation, and participate in on-call rotation.

Administer and maintain virtual RHEL servers across NIPRNet/SIPRNet/CV2, perform system monitoring, vulnerability and risk assessments, support RMF A&A documentation, develop/customize code for data analytics, implement backups and security controls, troubleshoot system issues, and collaborate with IT to enhance cybersecurity posture.

Provide on-site Tier 1–2 system and desktop support for Windows 11 and Server 2019 environments, manage Active Directory and Group Policy, maintain SIPR/NIPR compliance (STIG/DISA), perform patching, backup/recovery, asset management, document issues, and escalate Tier 3 problems while supporting audits and security readiness.

Maintain and improve the Integrated Management System (ISO 9001/14001/45001/50001), manage document control, coordinate audits, track nonconformances and CAPAs, produce IMS data/KPIs and dashboards, support cross-functional process alignment, training, and continuous improvement to sustain certification and compliance.

Responsible for maintaining and supporting mission-critical communications systems infrastructure, including installation, performance tuning, and cybersecurity compliance.

Lead administration and support of Linux and Windows systems in classified environments: manage virtualization, cloud/hybrid infrastructure, OS hardening/STIG compliance, automation, backups, incident response, performance tuning, and user support while collaborating with DevSecOps, cybersecurity, and engineering teams to ensure availability and security.