Top Systems Administrator Jobs

Provide field and escalation support for clients by troubleshooting end-user issues, administering Microsoft technologies, supporting VMware and Hyper-V environments, managing backup and disaster recovery solutions, and configuring network infrastructure. Communicate with customers, document procedures and service tickets in ConnectWise, track work and expenses, and collaborate independently in a fast-paced client-focused environment.

Provides first-level technical support for escalated tickets, diagnosing hardware, software, operating system, and network issues. Manages user accounts, installs and configures software and devices, and supports desktops, laptops, printers, and peripherals. Delivers professional end-user assistance, documents work, coordinates with vendors and IT teams, and maintains strong client relationships. Requires on-site client travel, clear communication, organization, independent work, and at least two years of technical support experience.

Administer and engineer Windows and Linux server environments, Active Directory/Entra ID, Microsoft 365, VMware, Exchange, storage, backup, cloud, and infrastructure applications. Support networking, security, compliance audits, troubleshooting, capacity planning, and 24/7 on-call operations. Collaborate across IT teams to improve system performance and reliability.

Administer and support the SAP Concur platform, including configuration, user access, expense policies, workflows, audit rules, integrations, reporting, and data quality. Troubleshoot employee and finance issues, coordinate with internal teams and SAP Concur support, maintain documentation and controls, support audits, and deliver training. The role also improves travel and expense processes and supports integrations with HR, identity management, corporate card, accounting, and ERP systems.

Provides enterprise IT support and junior systems administration across Windows, macOS, and Linux environments. Supports executive users, conference room technology, user accounts, endpoint security, asset lifecycle management, software licensing, incidents, documentation, and maintenance activities. Collaborates with infrastructure, network, and security teams while delivering customer-focused support across multiple locations.

Administer and maintain Windows and Linux systems across multiple domains supporting U.S. Army transportation operations. Responsibilities include system installation, troubleshooting, backups, upgrades, scripting, virtualization, security compliance, architecture audits, high availability, contingency planning, automated provisioning, and modernization support. The role collaborates with software engineers and stakeholders, develops technical documentation, and supports customer engagements and geographically dispersed teams.

Manage complex server, network, workstation, virtualization, Linux, and cloud infrastructures across classified and unclassified environments. Provide technical support, administer security controls, maintain SharePoint and system documentation, automate administrative tasks, monitor performance, perform backups and disaster recovery testing, and coordinate infrastructure changes. The role also supports aviation systems, mentors junior staff, and conducts periodic site visits for equipment lifecycle support.

Performs hands-on systems engineering and administration across mission-critical environments, including installations, configurations, patching, monitoring, troubleshooting, maintenance, deployments, and user support. Maintains system integrity, operational readiness, documentation, and issue escalation while collaborating with mission partners and engineering teams. Requires substantial systems engineering or systems administration experience and an active Top Secret/SCI clearance with full-scope polygraph.

Administer and maintain enterprise IT infrastructure across on-premises and cloud environments, including Windows Server, Azure, VMware, Microsoft 365, Active Directory, Intune, SQL Server, storage, and security platforms. Troubleshoot complex issues, manage backups, documentation, change processes, licensing, vendors, and technology projects. Support automation, responsible AI adoption, and proactive operational improvements while participating in rotating on-call support.

Administer and maintain secure Windows, cloud, virtualization, storage, and network infrastructure supporting national security systems. Configure TACLANE encryptors, troubleshoot outages, manage accounts and incidents, execute patching and vulnerability remediation, harden systems, conduct site surveys, and coordinate equipment logistics. The role requires an active Top Secret clearance with SCI eligibility, DoD certification, overnight shift availability, potential weekend or holiday coverage, and up to 25% CONUS/OCONUS travel.

Own Salesforce administration for Sales, Marketing, and Customer Success, including configuration, declarative automation, data quality, user support, permissions, and provisioning. Administer adjacent GTM tools such as Gong and Apollo.io, support territory, quota, and forecasting changes, and manage sandbox testing, deployments, release documentation, and user communications.

The Senior Systems Administrator supports the design, deployment, commissioning, operation, troubleshooting, and upgrades of LNG plant OT, telecom, network, server, firewall, and security systems. The role coordinates with EPC contractors, vendors, IT disciplines, project management, construction, installation, and commissioning teams to ensure systems meet specifications and are ready for operations. Responsibilities also include cost optimization, technical reporting, break/fix support, and travel to LNG sites or corporate locations as needed.

Administer identity, Google Workspace, email security, endpoint management, networking, SaaS applications, and cloud IAM for a distributed organization. Serve as the US escalation point for IT Support, manage onboarding and offboarding, conduct access audits, support acquisitions and platform consolidations, automate recurring tasks with scripts and APIs, coordinate security-provider activities, and maintain infrastructure documentation and runbooks. The role owns the New York office network and infrastructure projects end to end.

Leads configuration, deployment, operation, and maintenance of Microsoft and Linux servers supporting the U.S. Navy. Manages Active Directory, DNS, DHCP, SAN and storage systems, VMware virtualization, Microsoft SQL Server, and clustering technologies. Requires substantial systems administration experience, relevant certifications, U.S. citizenship, and an active Top Secret clearance.

Administer enterprise infrastructure spanning NetApp storage, VMware virtualization, cloud platforms, Linux systems, LDAP, and PKI. Develop Ansible and Bash automation for patching, configuration management, and maintenance. Support system accreditation, compliance documentation, monitoring, incident response, maintenance windows, and root cause analysis. Provide technical guidance and operate as a Data Transfer Officer while maintaining secure, reliable infrastructure.

Administer mission-critical enterprise and air-gapped systems, providing end-user support, server and storage lifecycle management, patching, compliance remediation, monitoring, specialized hardware deployment, documentation, and infrastructure modernization. The role supports local and remote sites, maintains Linux and storage environments, manages security findings, and participates in migrations, capacity planning, and technology refreshes.

Lead the design, implementation, operation, security, compliance, and lifecycle management of a customer program’s Linux-focused computing environment. Manage servers, networks, platform services, developer tooling, patching, vulnerability remediation, documentation, and operational alerts. Coordinate the supporting team and serve as liaison among the customer, program manager, and enterprise technology organization. The position requires an active TS/SCI clearance, U.S. citizenship, and on-site work in Tucson, Arizona.

Administers and optimizes high-performance computing infrastructure, including Linux and Windows systems, compute nodes, parallel storage, InfiniBand networks, Slurm scheduling, backups, virtualization, and monitoring. Supports system imaging, patching, security, disaster recovery, capacity planning, software licensing, and infrastructure upgrades. Collaborates with enterprise IT, information security, vendors, faculty, and students; documents procedures, provides technical guidance, participates in projects, and performs on-call support. Requires hands-on troubleshooting, automation, customer service, and continuous infrastructure improvement.

Administer enterprise analytics systems for Department of the Navy environments, supporting Tableau Server/Cloud, data pipelines, virtualized servers, access controls, system maintenance, and dashboard performance. Resolve multi-tier technical issues, data conversion anomalies, publishing errors, and vulnerabilities. Implement DoD cybersecurity requirements, maintain documentation, support demonstrations and training workflows, and provide technical reports to leadership. The role requires collaboration with government stakeholders and contractors while maintaining secure, reliable, and optimized system operations.

Provide systems administration, engineering, application, and hardware support for mission-critical federal systems. Administer and troubleshoot Windows servers, workstations, networks, databases, email services, virtualization, and security configurations. Monitor system health, resolve integration and data-flow issues, perform upgrades and patching, support Hyper-V virtualization, and respond to customer technical requests. The role is onsite in Annapolis Junction and requires an active TS/SCI clearance.

Administer and optimize Workday Financials, manage releases and integrations, maintain security and data integrity, support testing and deployments, produce reports and documentation, train users, and collaborate with Finance, IT, and vendors to improve processes and ensure compliance.

Administers and improves Salesforce-centered business systems, including configuration, automation, integrations, security, release management, testing, documentation, and platform support. The role troubleshoots connected billing, tax, and scheduling systems, maintains system health, and partners with business analysts and stakeholders to deliver reliable solutions.

Administers digital banking, payment, and Treasury platforms, including configurations, access, integrations, file transfers, testing, upgrades, and troubleshooting. Coordinates vendors and cross-functional teams, supports implementations, develops procedures and training materials, and provides Tier 3 support. Maintains SOX controls, access reviews, reconciliations, audit evidence, system documentation, and issue remediation. Identifies process improvements that reduce manual work, improve reliability, and strengthen controls.

Administer and optimize Windows and Linux infrastructure supporting classified programs. Collaborate with cybersecurity, networking, storage, engineering, and technology teams to resolve infrastructure and compliance challenges. Develop and enforce system administration standards, participate in change management, provide technical guidance, and maintain secure, reliable 24x7 operations. The role is fully onsite at White Sands Missile Range and may require up to 20% domestic travel.

Administer, deploy, configure, and maintain AWS cloud applications across Windows and Linux environments. Manage financial and analytics applications, batch processes, backups, user accounts, monitoring, incident resolution, security compliance, and infrastructure modifications. Automate production processes, optimize system performance and cost, coordinate maintenance, and provide customer and on-call support for national security systems.