Top Senior System Administrator Jobs

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.

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

Lead and manage classified IT infrastructure operations: administer Windows and RHEL servers, VMware virtualization, storage, networking, and cybersecurity posture (DISA STIGs, Nessus). Maintain classified development/integration environments, perform after-hours maintenance, and achieve required certifications (e.g., McAfee ePO).

Administer and troubleshoot heterogeneous Windows and Red Hat Enterprise Linux environments, manage DNS/DHCP/AD and server replication, perform scripting, system hardening, audit log collection, and support 24x7 operations. Collaborate with cybersecurity on compliance and vulnerability remediation, provide documentation and training, and support virtualization, imaging and deployment tasks. Active transferable Secret clearance and on-site work in Marlborough, MA required.

Support an IC-wide mission environment as a senior Linux Systems Administrator/Engineer. Require 10+ years Linux (CentOS/RHEL) experience, JBoss/Wildfly administration, VMware VM creation/operation, and Security+ certification. Desired skills include Red Hat Ansible, storage, networking, security compliance, authentication, shell/Python scripting, physical server administration, Oracle DB/DBA familiarity, JSON, and possession of/eligibility for high-level clearances.

Support an Intelligence Community mission environment as a senior Linux system administrator/engineer. Administer CentOS/RHEL systems, install/configure/maintain JBoss/Wildfly, manage VMware VMs, ensure security/compliance, perform scripting (Shell/Python), support storage, networking, authentication, physical servers, and occasional Oracle/DBA tasks. Must meet clearance and shift availability requirements.

Senior Systems Administrator responsible for designing and implementing infrastructure changes, managing VMware/Nutanix virtual environments, administering Windows Server and Linux, creating STIG-compliant images, deploying software via SCCM/PDQ, scripting automation (PowerShell/Bash), mentoring junior staff, and administering Active Directory, GPO, DNS, and DHCP.

Provide on-site systems administration for classified DoD environments (SIPR), managing Windows/Linux servers, virtualization, storage, backups, encryption, and user-requested software. Troubleshoot hardware/software issues, collaborate with cybersecurity, obtain DoD 8140/8570 certification within six months, and support 24x7 operations with occasional travel (up to 10%).

Provide onsite systems administration for SIPR and other information systems in a heterogeneous Windows/Linux environment. Manage virtualization, server hardware, RAID, encryption, AD/DNS/DHCP, backups/restores, software installs, and collaborate with cybersecurity. Maintain 24x7 systems, obtain DoDD 8140/8570 certification (e.g., CompTIA Security+ CE) within six months, and travel domestically up to 10% annually.

The Senior System Administrator manages and maintains computerized systems in a cGMP environment, ensuring compliance and supporting users while coordinating with IT and QA.

Provide support for the design, configuration, and deployment of Windows Server environments, including virtualization and disaster recovery solutions.

The Senior System Administrator will design, configure, and support Windows Server environments, manage virtualization, and implement disaster recovery strategies.

Ensure immediate response to outages, support mainframe systems, analyze and resolve systems problems, and monitor software and hardware performance.

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.

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.

Senior System Administrator supporting CNO capabilities: install, configure, and sustain NVIDIA GPU-accelerated systems in a government warehouse, document procedures, optimize workflows, troubleshoot hardware/software, coordinate with onsite admins and engineering teams, support virtualization and future AWS/LLM integrations, and improve operational processes.

Provide enterprise system administration and platform operations for a large-scale GRC solution: install, configure, patch, harden, monitor, troubleshoot, and sustain servers, virtualized and cloud resources. Enforce access controls, remediate vulnerabilities, maintain compliance documentation and runbooks, and support modernization and integrations to ensure secure, reliable GRC operations.

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.

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.

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

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.

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.