Top Senior System Administrator Jobs

The Senior System Administrator will manage system administration tasks, including system integration, security, and performance monitoring while mentoring teams and providing technical support.

Responsible for designing, implementing, managing and maintaining data storage systems, including performance monitoring, capacity planning, security, and disaster recovery.

Design, deploy, and operate scalable storage infrastructure (SAN/NAS/DAS/Object) including Ceph. Perform capacity planning, backup/DR, monitoring, troubleshooting, automation via scripting/IaC, documentation, and collaborate on upgrades, migrations, and integrations to ensure availability and performance.

Lead design, implementation, administration, and support of complex, geographically dispersed data-center infrastructure. Manage Windows Server 2019/2022 environments, Active Directory, Group Policy, PKI, IIS, clustered services, and Linux (Ubuntu/RHEL). Administer virtualization (VMware/Hyper-V), storage (SAN/NAS/RAID), backup/recovery (Veeam/Commvault), and disaster recovery. Troubleshoot cross-layer infrastructure issues, document procedures, and communicate with stakeholders. Requires Top Secret clearance and relevant certifications.

Senior system administrator responsible for Windows server and Active Directory architecture, STIG hardening and GPO implementation, large-scale data center operations, migrations (physical-to-virtual), enterprise backup management, and automation using VB/PowerShell within multi-tenant enterprise environments.

Lead senior technical engineer for full-lifecycle infrastructure and sustainment of the FMWorkFlow environment. Responsibilities include Windows/Linux administration, Active Directory and service-account engineering, Nutanix virtualization, performance/capacity analysis, patch and configuration baseline management, backup/recovery and resilience, cross-stack integration with DB2/WebSphere and cybersecurity, Level III escalation, RMF/STIG compliance, and mentoring junior administrators.

Provide systems administration for Windows and Red Hat Enterprise Linux environments, manage AD, DNS, DHCP, server replication, virtualization, backups (RAID, Veeam), and cloud resources. Troubleshoot hardware/OS integration, install/configure applications, support 24x7 operations, collaborate with cybersecurity, maintain documentation and training, and obtain required DoDD 8140/8570 certification within six months.

Lead systems administrator for classified DoD/AF environments responsible for design, implementation, security, maintenance, and optimization of Windows/Linux, virtualization, container, and cloud infrastructure. Ensure RMF/DISA STIG compliance, perform vulnerability assessments, support SCI/SAP networks, automate infrastructure tasks, and lead/mentor technical staff while interfacing with government stakeholders.

Provide desktop, server, and network administration for mission and analytic networks, including application support, server administration, user account management, and basic LAN infrastructure support.

Administer Windows and Linux servers, virtualization (VMware/Hyper-V), enterprise storage, backup/recovery, and simulation software for Navy LVC training. Maintain RMF/STIG compliance, perform vulnerability remediation, support distributed training events, and provide operational support during major fleet exercises.

Administer and maintain Linux (RHEL/CentOS/Ubuntu) and Windows Server environments (AD, Group Policy); automate tasks with Python/Bash/PowerShell; monitor and troubleshoot systems; manage virtualization (VMware/Hyper-V), backups, security, user accounts, and documentation while collaborating with infrastructure and application teams.

Senior Systems Administrator responsible for designing and implementing infrastructure changes, managing VMware/Nutanix virtual environments, administering Windows and Linux servers, creating STIG-compliant images, deploying software via SCCM/PDQ, automating tasks with scripting, mentoring junior admins, performing hardware maintenance, and administering Active Directory, GPO, DNS, DHCP and domain controllers.

The Senior System Administrator will oversee the administration and security of Linux systems, manage updates, and ensure operational stability in cloud environments.

Senior System Administrator responsible for engineering, administering, and supporting enterprise endpoint environments. Duties include deploying and maintaining Windows/macOS endpoints, virtual desktop and cloud-based platforms, implementing security controls and compliance, troubleshooting complex issues, automating tasks with PowerShell, participating in endpoint modernization (Intune, Autopilot, Windows 365, AVD), and working with Security, Infrastructure, and Service Desk teams to ensure stable, secure endpoint operations.

Lead administration and support of corporate Microsoft infrastructure, VDI/RDS access platforms, virtualization, storage, backups, and cloud services. Perform AD domain/forest migrations, replace legacy VDI and load‑balancing stacks, maintain documentation, resolve incidents to SLA, participate in projects and on‑call rotation, and collaborate with NOC, InfoSec, DevOps, and L2 teams.

The Senior Systems Administrator supports PMIS by managing system performance, user access, troubleshooting, training, and system integrations. They ensure alignment with project management processes and work closely with stakeholders for effective use of PMIS.

Lead configuration, maintenance, and expansion of mission-critical Windows and Linux server infrastructure. Monitor systems, apply patches and security fixes, evaluate new tools, write automation scripts, mentor IT staff, and participate in on-call rotation to ensure high availability.

Senior Systems Administrator responsible for IT systems support, troubleshooting, virtualization management, and scripting for system configurations and dataflows.

Responsible for day-to-day systems administration, support of Linux environments, troubleshooting, managing maintenance tasks, and providing technical guidance to the team.

Provide on-site systems administration for classified DoD environments, managing Windows/Linux servers, virtualization, backups, RAID/encryption, Active Directory, and server replication. Work with cybersecurity teams, maintain 24x7 systems, obtain DoDD 8140/8570 certification (CompTIA Security+ CE) within six months, and travel up to 10% domestically.

Provide systems administration for classified and unclassified Microsoft and Linux environments, managing virtualization, AD/DNS/DHCP, RAID, encryption, backup/restore, and server software. Work with cybersecurity teams to meet DoD security requirements, obtain required DoD/8570 certification, support 24x7 operations, and travel domestically up to 10% as needed.

Provide system administration and troubleshooting for complex, geographically distributed and air-gapped environments. Maintain servers, AD, virtualization, patching, vulnerability management, backups, security controls, documentation, and user/support communication. Support system engineering requests, perform cert renewals, and optimize application performance.

Lead design, maintenance, and optimization of enterprise server, storage, network, and cloud environments. Automate tasks with scripting, enforce security and compliance, manage disaster recovery, escalate Tier 2/3 incidents, mentor junior staff, and coordinate vendor and migration projects.

Provide senior-level Windows/Linux systems administration and engineering for mission-critical USAF infrastructure. Responsibilities include Active Directory and virtualization engineering (Nutanix), performance and capacity analysis, patching and vulnerability remediation, backup/recovery and COOP support, Level III technical escalation, RMF/A&A compliance support, cross-team coordination, and maintaining version-controlled engineering and operational documentation.

Provide on-site senior-level systems administration: troubleshoot network (Layer 1-3), Windows endpoints, Active Directory, Google Workspace, VTC/Google Meet hardware, printers/projectors, VPN/BitLocker, MDM, ticketing, documentation, and mentor Tier 1 staff while coordinating vendor support.