Top Systems Administrator Jobs

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.

Administers and optimizes the Defense Logistics Agency’s Okta environment, including deployment, configuration, integrations, maintenance, upgrades, performance analysis, automation, documentation, training, and technical support. Resolves connectivity issues, recommends system enhancements, supports operational systems, and directs system administrators. Requires advanced knowledge of application networking, load balancing, and fault tolerance, plus Okta certification and five years of professional Okta experience.

Administer and support mission-critical IT infrastructure, including Windows and Linux servers, storage, virtualization platforms, networking, and workstations. Troubleshoot complex infrastructure issues, deploy and maintain systems, apply patches, implement security controls, and ensure compliance. Support infrastructure projects, documentation, system hardening, backups, and disaster recovery. Provide technical support, coordinate with cybersecurity and other teams, and communicate infrastructure solutions to technical stakeholders and executive leadership.

Administer enterprise IT systems and SaaS platforms while deploying and governing AI tools, MCP servers, and agent infrastructure. Manage service accounts, credentials, permissions, integrations, onboarding and offboarding, automation, documentation, and technical debt. Serve as an escalation point for complex ITSM issues, collaborate across Security, People Ops, and Engineering, and mentor IT Support staff on processes and troubleshooting.

Manage and maintain network infrastructure, servers, virtualization platforms, cloud services, backups, and security controls. Monitor performance, troubleshoot hardware and software issues, support end users, document configurations, and assist with infrastructure upgrades. The role also requires maintaining Windows and Linux environments, automating tasks through scripting, ensuring data protection, and supporting compliance with IT and security policies.

Administer, maintain, monitor, troubleshoot, and secure Linux-based systems across classified and unclassified research environments. Responsibilities include server, workstation, storage, networking, user access, patching, backups, performance monitoring, Tier 1/2 support, scripting automation, documentation, and vulnerability remediation. The role also supports mixed Windows environments and coordinates issue resolution with customers, researchers, engineers, subcontractors, and internal teams.

Manage and secure Linux servers and desktops in classified environments. Responsibilities include continuous vulnerability monitoring with Nessus, remediation through patches and configuration changes, STIG and RMF compliance, networking services, user access, system hardening, performance monitoring, backups, documentation, auditing, and collaboration with cybersecurity, network, and application teams.

Administer and support production Linux systems, primarily Ubuntu, while troubleshooting infrastructure, networking, virtualization, cloud environments, monitoring, logging, security, and performance issues. Assess systems and embedded software, analyze code and interfaces, identify safety and mission-critical risks, validate requirements and testing procedures, document findings, and present results. The role requires an active Top Secret clearance, SCI eligibility, U.S. citizenship, and potential polygraph eligibility.

Lead Windows and VMware systems administration for classified government contracts: design, maintain, and secure Windows domain architectures, implement and manage VMware environments, ensure backups and recovery, enforce STIG/RMF compliance, audit security logging, troubleshoot cross-discipline issues, mentor junior staff, and coordinate vendor and system lifecycle activities in a Top Secret/SCI environment.

Administer, secure, and maintain Windows-based on-premises and Azure infrastructure, including servers, identity services, endpoints, databases, networking, storage, virtualization, backups, and disaster recovery. Build monitoring and alerting, support Microsoft 365 and Intune, automate tasks with PowerShell, maintain documentation, and assist with compliance, vulnerability management, incident response, and hybrid cloud operations.

Administer and sustain Windows and Linux environments across virtual server clusters, VDI, and enterprise infrastructure. Responsibilities include Active Directory, DNS, GPO, Exchange, SCCM, vulnerability remediation, IAVA management, security scanning, patching, monitoring, troubleshooting, documentation, outage communications, IT enhancements, and on-call support. The role also supports security compliance, system accreditation, network infrastructure, and project-related activities in a classified environment.

Installs, configures, secures, and maintains enterprise Linux infrastructure, virtualization platforms, identity and directory services, and cloud operations tools. Resolves escalated Level II and III support issues, supports patching, backups, monitoring, automation, containerization, and application distribution. Leads or supports major IT projects, documents procedures, mentors team members, and participates in on-call and after-hours support.

Administer and support multiple go-to-market and sales technology platforms. Manage user accounts, permissions, roles, access requests, reports, dashboards, workflows, and basic configurations. Provide Tier 1 troubleshooting and documentation, monitor platform health, support implementations and integrations, and identify process improvements. Partner with Sales, Marketing, Customer Success, Revenue Operations, and Enablement teams while exploring AI and automation opportunities.

Supports the design, development, integration, operation, and maintenance of complex technology systems. Analyzes system requirements, processes, and methodologies; develops innovative solutions; supports enterprise modernization and system integration; contributes to strategic planning; and may lead teams while coordinating with senior management. Requires advanced systems engineering expertise, strong communication, leadership, and supervisory abilities, plus an active TS/SCI clearance with polygraph.

Manage and maintain multi-cloud VDI environments and 10ZiG thin-client endpoints. Configure Azure Virtual Desktop, AWS WorkSpaces, and Horizon; build desktop images, profiles, applications, host pools, and scaling configurations. Test performance, apply DISA STIGs, support security compliance and ATO/CTO activities, and create technical documentation. The role requires onsite work at NASIC and an active TS/SCI clearance.

Administers and supports organization-wide software and data systems, including user access, configurations, integrations, reporting, documentation, vendor coordination, licensing, renewals, training, and data quality. The role supports onboarding and offboarding access, security reviews, system governance, troubleshooting, process improvement, and cross-department workflows. Travel to Austin-area locations and occasional North Texas properties is required, with occasional evening or weekend work for upgrades, incidents, and maintenance.

Administers and optimizes Windows and Linux servers, VMware virtualization, SAN storage, backup and recovery systems, and enterprise applications. Manages Active Directory, Group Policy, networking services, access controls, patching, security controls, monitoring, incident response, documentation, and disaster recovery activities. Provides user and infrastructure support, collaborates with IT teams, participates in on-call support, and travels to the Chicagoland data center for hardware installation and maintenance.

Installs, configures, secures, and maintains enterprise workstations, servers, operating systems, networks, storage systems, and data center technologies. Provides troubleshooting, backups, restores, system upgrades, security support, hardware tracking, documentation management, and operational status reporting. Supports web pages, evaluates new technologies, coordinates upgrades, and recommends process improvements. Positions support U.S. government test-range contracts and require U.S. citizenship, a government security clearance, and a valid state-issued driver’s license.