Top Systems Administrator Jobs

Administers and supports enterprise PKI infrastructure across Windows, Red Hat Linux, and Cisco platforms. Manages certificate authorities, templates, issuance, renewal, revocation, OCSP, CRLs, HSMs, smart cards, NDES, and third-party integrations. Troubleshoots Tier 2 and Tier 3 incidents, automates monitoring with PowerShell, maintains documentation, and ensures compliance with DoD STIG and zero-trust requirements. Supports a globally distributed environment of more than 85,000 users, including shift work, on-call rotations, and weekend maintenance.

Administer enterprise Cisco Unified Communications Manager and related telephony systems, including maintenance, upgrades, documentation, dial plans, traffic routing, performance monitoring, SLA support, and break/fix resolution. Support TDM and VoIP platforms in large-scale, multi-cluster environments while applying security and compliance practices. The role is fully onsite in Columbia, Maryland, and requires TS/SCI with polygraph clearance.

The Senior Systems Administrator installs, configures, maintains, and optimizes Windows and Linux systems, network software, application environments, and databases. Responsibilities include application networking, load balancing, vulnerability management, security patching, monitoring, performance tuning, automation, environment management, SSRS support, backups, troubleshooting, documentation, and deployment planning. The role supports multiple operational locations and requires collaboration with technical, security, development, database, and customer teams within DoD environments.

Provides onsite systems administration for aircraft and weapons systems networks at a government hosting facility. Responsibilities include deploying and maintaining physical and virtual infrastructure, managing servers, workstations, applications, backups, user accounts, permissions, networking, and disaster recovery. The role also requires troubleshooting, documentation, customer support, security monitoring, DoD compliance, and Agile project participation. A Top Secret clearance, Security+ or equivalent certification, operating system certification, and at least three years of relevant experience are required.

Administer and support enterprise Microsoft 365 and Google Workspace platforms, including messaging, collaboration, identity, security, compliance, retention, and data governance services. Investigate complex incidents, implement platform changes and migrations, develop PowerShell and Microsoft Graph automation, monitor service health, and maintain documentation, procedures, and runbooks. The role partners with university departments and technical teams to deliver reliable, secure, and supportable productivity solutions.

Provide day-to-day administration and technical support for Linux/Windows systems, virtualization (VMware), storage (NAS/SAN), backups, patching, and hardware/software installs. Configure servers, workstations, and network components; perform capacity planning, tuning, testing, documentation, and troubleshooting in a secure federal environment requiring TS/SCI with polygraph.

Administer and troubleshoot client desktop, server, networking, virtualization, Microsoft 365, Azure, security, backup, and cloud environments. Resolve escalated infrastructure issues, manage tickets according to SLAs, support customers remotely and onsite, and participate in on-call rotations. Mentor Systems Technicians, provide technical guidance, create documentation and SOPs, improve processes, and promote effective use of AI-enabled administration tools.

Plan, build, administer, secure, and maintain SAP information systems using Linux, Windows, virtualization, VDI, Splunk, networking, and encryption technologies. Maintain system documentation, authority to operate, configuration management, and change control. Support data transfers, COMSEC keying material, Type 1 encryption devices, and coordination with IT teams and management. The role is fully on-site in Patuxent River, Maryland and requires a Final DoD Top Secret clearance.

Owns configuration, governance, optimization, and integration of SAP ByDesign and Salesforce. The role standardizes cross-functional business processes, maintains master data, troubleshoots issues, develops dashboards and KPIs, documents workflows, trains users, and leads system enhancements. It also supports mergers and acquisitions through data migration, process harmonization, and post-acquisition ERP alignment.

Provides SOCRATES system administration, desktop support, networking, troubleshooting, hardware and software configuration, network integration, and help desk support for USSOCOM and DoD users. Responsibilities include Windows 11 migrations, workstation replacements, communications migrations, LAN installation, system maintenance, and CONUS/OCONUS technical support. The role may require contingency deployments, extended shifts, and frequent travel to DoD installations.

Manage and maintain Windows and Linux systems, servers, networks, applications, infrastructure, permissions, and system performance. Configure operating systems and management tools, troubleshoot technical issues, implement automation and scripting, perform security monitoring, maintain documentation, and ensure compliance with organizational standards. The role also oversees inventory, supports project execution, communicates with stakeholders, evaluates emerging technologies, and mentors junior team members.

Senior systems administrator responsible for secure, classified IT environments: configure and maintain Lab-in-a-Box, VMware, backups, endpoint protection, vulnerability scanning, Active Directory/GPOs, Splunk logging, and ensure STIG/RMF/NISPOM compliance. Lead data spill response, system sanitization, documentation, and audit readiness while collaborating with security stakeholders in a 100% onsite classified area.

Designs, operates, and improves enterprise endpoint management services using Microsoft Intune, Entra ID, Windows 365, and Azure Virtual Desktop. Responsibilities include device policies, application deployment, patching, automation, compliance, identity, Cloud PC administration, monitoring, Tier 3 support, incident leadership, roadmap development, technical documentation, mentoring, and cross-functional initiative leadership. The role participates in on-call rotations and occasional travel as needed.

Provides junior-level IT support for Department of State systems, including ticket triage, desktop and mobile device support, Government-Furnished Equipment, application deployment, infrastructure and network administration assistance, web services, account provisioning, documentation, and change management. The role works under senior staff supervision and requires an active Secret clearance, basic troubleshooting knowledge, and willingness to develop skills across multiple IT domains.

Build and operate Linux-based ML training clusters and inference cloud infrastructure. Responsibilities include access management, hardware validation, job scheduling, container orchestration, CI/CD, observability, incident response, capacity planning, autoscaling, cost tracking, and production security. The role supports heterogeneous accelerators, large-scale training, LLM serving, developer workflows, and reliable model deployments while collaborating across training, inference, product, and technical teams.

Administer and support enterprise Citrix Virtual Apps and Desktops and Citrix DaaS environments across on-premises and cloud platforms. Install, configure, patch, upgrade, monitor, and troubleshoot Citrix components, Windows Server hosts, applications, profiles, authentication, networking, and user sessions. Manage catalogs, delivery groups, images, policies, and access components. Automate administration with PowerShell, execute changes and disaster recovery activities, maintain documentation, and provide advanced escalation support, mentoring, and technical leadership.

Administers and engineers Microsoft Intune, Entra-integrated endpoint management, and Windows 365 services at enterprise scale. Responsibilities include Windows enrollment, Autopilot, configuration and compliance policies, endpoint security, application deployment, patching, automation with Ansible and PowerShell, Cloud PC operations, troubleshooting, platform upgrades, documentation, disaster recovery, and technical leadership.

Administers and controls QMS documentation, including procedures, work instructions, forms, manuals, revision histories, approvals, releases, and archives. Coordinates periodic reviews with process owners, ensures current documents are accessible, supports audit readiness, tracks overdue updates, and maintains records related to corrective actions and process changes. The role also improves document-control workflows and guides employees on documentation practices in an aerospace repair and overhaul environment.

Administer VMware, Windows Server, Active Directory, enterprise storage, backup, networking, PKI, and Linux environments. Implement DISA STIGs, conduct vulnerability scans, remediate POA&Ms, patch systems, support RMF assessments, and maintain security baselines and documentation. Provide hardware support, monitoring, technology refresh assistance, and IT lifecycle support in a federal environment.

Administer and troubleshoot client desktop, server, networking, virtualization, Microsoft 365, Azure, security, backup, and cloud environments. Resolve escalated infrastructure issues, support service desk and field operations, maintain documentation, follow ITIL and security practices, and mentor Systems Technicians. The role also contributes to process improvement, SOP development, AI-enabled administration, client consultations, and technical training across multi-client managed service environments.

Administers and supports client desktop, server, networking, virtualization, Microsoft 365, cloud, backup, and security environments. Resolves escalated infrastructure issues, manages tickets, troubleshoots complex systems, documents solutions, supports client environments, and mentors Systems Technicians. The role also contributes to process improvement, training, AI-enabled administration, and may participate in an on-call rotation.

Administer and improve server, network, cloud, software, hardware, backup, monitoring, and Microsoft 365 environments. Provide Tier 2 support, assist with infrastructure deployments, security assessments, user training, and IT modernization projects. Manage hypervisors, storage, disaster recovery, network equipment, and phone systems while supporting business users and participating in an onsite on-call rotation.

Provides Tier 2 technical support and systems administration, troubleshooting enterprise IT issues, documenting solutions, collaborating on advanced resolutions, and supporting after-hours or on-call needs. The role is onsite in Washington, DC, requires U.S. citizenship, an active Top Secret clearance with SCI eligibility, and DoD 8140 IAT II compliance.

Provides systems administration and IT support for DoD tactical, afloat, and laboratory environments. Plans, configures, tests, maintains, and upgrades operating systems and development/test environments. Performs troubleshooting, patching, backups, security assessments, vulnerability mitigation, and STIG compliance using Navy and DoD tools. Collaborates with cybersecurity, network, systems, and software engineers while supporting agile release and automation processes.

Build, manage, and optimize secure AWS cloud infrastructure across multi-account environments. Install and maintain servers and platforms, monitor performance, troubleshoot outages, manage access controls and backups, perform patching and STIG compliance, and support Kubernetes/EKS workloads. The role also contributes to infrastructure as code, disaster recovery, automation, technical documentation, and resilience engineering within a SAFe Agile program. An active DoD Secret clearance, five years of experience, and quarterly travel to Scott Air Force Base are required.