Top Systems Administrator Jobs

Administer secure and air-gapped enterprise systems, including installation, configuration, upgrades, patching, virtualization, Windows and Linux environments, monitoring, troubleshooting, documentation, and Tier II support. The role maintains compliance and security standards, supports users, resolves infrastructure issues, and escalates problems as needed. It is onsite in El Segundo, California, requires U.S. citizenship and the ability to obtain a Secret clearance, and may involve occasional travel.

Administers, configures, monitors, and troubleshoots IBML scanning and imaging systems supporting federal document workflows. Provides Tier 2/3 support, resolves ingestion and trace failures, assists with upgrades and maintenance, integrates scanners with document management and archival systems, monitors performance, documents procedures, and collaborates with stakeholders and vendors. The role requires onsite support, occasional after-hours work, U.S. citizenship, and eligibility for a Public Trust clearance.

Maintains and supports enterprise technology infrastructure, including Azure, Microsoft 365, Windows and Linux servers, virtualization, mobile device management, backups, disaster recovery, websites, email, and user access. Provides end-user technical support, troubleshoots systems, manages hardware and software standards, supports IT policies and projects, trains team members, and participates in an after-hours on-call rotation.

Maintains classified IT infrastructure, including servers, workstations, networks, firewalls, and security systems. Performs system administration, patching, deployments, account management, access control, troubleshooting, documentation, lifecycle management, and security compliance reviews. Supports accreditation processes, identifies and mitigates vulnerabilities, coordinates operational risks, validates system performance, and provides technical guidance to junior staff. The role is fully onsite in Cambridge, Massachusetts and requires an active Secret clearance.

Leads enterprise systems and network administration, operations, maintenance, outage response, incident recovery, and service-level delivery for USMEPCOM. Coordinates geographically distributed technical teams, vendors, and leadership during outages. Oversees infrastructure integration, system configuration, testing, interoperability, continuity of operations, disaster recovery, and RMF compliance. Maintains incident response and outage procedures while supporting servers, operating systems, databases, collaboration tools, virtualization, cloud environments, networks, and security infrastructure.

Maintains and supports Windows Server environments by troubleshooting issues, applying patches, managing certificates, deploying applications, and performing upgrades. Collaborates with IT teams and vendors to implement infrastructure solutions, ensure security and compliance, document procedures, support operational improvement projects, and report on system performance. The role requires a Secret clearance, eligibility for Top Secret/SCI, U.S. citizenship, and applicable DoD 8140 or 8570 certification.

Administers, configures, develops, maintains, and supports the City's Questica and OpenBook budgeting systems. Responsibilities include coding, workflows, reporting, integrations, troubleshooting, upgrades, data validation, vendor coordination, and system security. The role supports data exchanges with the BRASS financial system, resolves discrepancies, translates budget-office requirements into technical solutions, and provides timely assistance during critical budget and reporting periods.

Administers and maintains secure organizational messaging platforms across classified and unclassified defense networks. Responsibilities include message routing, queue monitoring, gateway and Windows server administration, Active Directory, virtualization, infrastructure monitoring, incident escalation, ITSM ticket resolution, failover coordination, and operational documentation. The role supports high-availability mission-critical communications in a Pentagon-based NOC or gateway operations environment.

Administer and maintain mission-critical UNIX servers and applications across production, development, test, and continuity environments. Responsibilities include installation, troubleshooting, monitoring, optimization, capacity planning, backups, recovery, system software maintenance, access management, documentation, and after-hours support. The role also maintains cybersecurity compliance through vulnerability remediation, STIGs, CND directives, RMF, and other DoD requirements. Work is fully onsite in Mechanicsburg, Pennsylvania, or Yorktown, Virginia.

Provides company-wide support for computer hardware, software, peripherals, and end users. Installs, tests, repairs, and maintains systems; troubleshoots technical issues; manages software and scheduled maintenance; supports cloud backup, business continuity, virtualization, Linux, Active Directory, Exchange, Office 365, and VoIP systems. The role also documents systems, recommends technology improvements, assists with IT projects and quality assurance, and supports remote employees.

Installs, configures, monitors, secures, and maintains servers, systems, hardware, software, backups, user accounts, and infrastructure applications. Troubleshoots hardware and software failures, applies patches and upgrades, performs performance tuning, maintains documentation and data center monitoring equipment, supports clients, and participates in an on-call rotation.

Administer and optimize enterprise Windows and Linux hosting environments supporting mission-critical applications. Responsibilities include virtualization, cloud and DevOps support, automation, CI/CD, patching, vulnerability remediation, monitoring, backups, disaster recovery, incident response, documentation, and security compliance. The hybrid role requires on-site work in McLean, Virginia, three days weekly, and collaboration with developers, cybersecurity staff, network engineers, and government stakeholders.

Provides hands-on administration and support for Linux-based lab hardware, operating systems, applications, and networks. Responsibilities include installation, configuration, patching, backups, vulnerability scanning, DoD STIG application, Linux scripting, and Ansible automation. The administrator troubleshoots technical issues, maintains security and configuration compliance, and collaborates with engineering and administration teams. This is a full-time onsite position supporting an embedded lab environment at NAS Patuxent River.

Manage and monitor PKI systems and infrastructure, including certificate issuance, renewal, revocation, certificate authorities, registration authorities, and hardware security modules. Troubleshoot PKI issues, develop policies and procedures, conduct audits, maintain documentation, and automate processes using scripting. The role is onsite, requires U.S. citizenship, DoD 8140 IAT II compliance, and eligibility to obtain a Top Secret/SCI clearance.

Provides second-tier technical support through a ticketing system, resolving Level 2 end-user and infrastructure issues. Responsibilities include Active Directory, Microsoft 365, VPN, GPO, VMware, servers, SAN, firewalls, MFA, Azure, Exchange, wireless networks, backups, replication, and storage. The role also performs customer-site equipment installations, documents work, follows SOPs, manages service expectations, and delivers technical guidance and customer service.

Provide on-site systems administration and user support for DoD/MDA procurement systems (ECWM, ORBIT, PIEE, WAWF, FPDS, SAM.gov). Manage accounts, run interactive SQL, maintain security models, create SOPs, deliver user training, and ensure compliance and data integrity. Requires active Secret clearance.

Maintain and optimize servers, networks, endpoints, communication systems, and security software. Provide desk-side and remote support, manage ServiceDesk tickets, onboard and offboard employees, configure devices, and administer Office 365 or Google Workspace. Maintain hardware logistics and asset records, support network upgrades and laboratory infrastructure projects, enforce IT governance and ISO 27001-aligned policies, manage incidents, and improve service processes while collaborating with international IT teams and vendors.

Own and scale IonQ’s NetSuite ecosystem and connected finance systems. Responsibilities include NetSuite administration, workflow and module optimization, ERP migrations and integrations, requirements gathering, cross-functional solution delivery, financial systems administration, and SOX-compliant controls. The role supports finance, supply chain, operations, IT, manufacturing, government contracts, and international business while managing internal and external support resources.

Administer and support production Linux systems, primarily Ubuntu, while troubleshooting infrastructure, networking, virtualization, cloud environments, monitoring, logging, security, and system performance. The role also assesses software and embedded systems, identifies safety and mission-critical risks, validates requirements and testing procedures, documents findings, and presents results. Preferred experience includes Docker, Ansible, Terraform, AWS, Nginx, Grafana, ELK, Python, and high-availability infrastructure.

Serve as a Linux systems subject matter expert supporting U.S. Army operations. Architect, deploy, configure, secure, automate, monitor, and maintain enterprise RHEL infrastructure. Manage Ansible and Bash automation, storage, identity integration, middleware hosting, certificates, vulnerability remediation, DISA STIG compliance, performance tuning, and incident root-cause analysis. The role requires Secret clearance eligibility and supports classified environments at Aberdeen Proving Ground.

Leads enterprise Linux architecture, administration, and lifecycle activities for classified government systems. Designs high-availability, backup, disaster recovery, virtualization, containerization, networking, identity, and automation solutions. Directs major system enhancement projects, establishes technical standards, supports multiple networks, and resolves complex technical challenges independently. Provides mentorship and technical leadership while maintaining documentation, security, monitoring, and compliance practices. This is a full-time, on-site role requiring after-hours or weekend work as needed.

Provide hands-on IT administration for approximately 230 employees across macOS and Windows. Responsibilities include Tier 1 and Tier 2 support, SaaS and identity administration, endpoint management, onboarding and offboarding, asset inventory, compliance reporting, workflow monitoring, scripting, documentation, lab and VDI support, and vendor coordination.

Administer and harden production Linux systems, troubleshoot complex infrastructure and service issues, manage operating system lifecycles, and develop automation using Bash, Python, and Ansible. The role includes configuration management, security updates, monitoring, backups, recovery testing, incident ownership, documentation, controlled changes, and shared on-call support across physical and virtualized environments.

Maintains and secures Windows and Linux servers, hosted applications, databases, Active Directory, and SSO services. Provides end-user and help desk support, develops PowerShell and Bash automation scripts, manages API integrations, troubleshoots systems remotely, and coordinates upgrades and maintenance. Supports cloud, network, security, and Ellucian projects while overseeing assigned IT initiatives.

Administer Fluke’s ISO-based quality management systems, coordinating internal audits, nonconformances, corrective actions, document control, records, workflows, and quality metrics. The role manages Oracle PLM quality processes, supports audit readiness, monitors action completion, maintains controlled documentation, assists with workflow enhancements, and collaborates with Quality, Operations, Engineering, Supply Chain, Compliance, EHS&S, and audit providers.