Top Senior System Administrator Jobs

Manage and secure enclave development networks: administer Windows and Linux servers, VMware virtualization, Active Directory/GPO, storage (NetApp), networking, backups/recovery, troubleshooting, system hardening, compliance scanning (Nessus/ACAS), account/access management, and document operational procedures to meet RMF/security requirements.

The Senior System Administrator will secure, sustain, and optimize complex DoD environments, perform system upgrades, manage security configurations, and ensure compliance with various security standards.

Senior Linux System Administrator to maintain on-premises and AWS Linux servers, support 24x7 on-call operations, perform security patching/STIG updates, manage RHEL subscriptions, automate administration tasks, assist cloud migrations, support A&A audits and ensure system backups, performance tuning, and certificate management while coordinating maintenance with stakeholders.

Provide on-site systems administration and real-time support for ground systems supporting flight operations. Install, configure, troubleshoot, and maintain communications and computer systems, manage accounts and equipment, perform field integration and repairs on the flightline, support STIG compliance and security updates, and coordinate with engineers and MOBs for tests, maintenance, and data movement.

Support and administer enterprise classified Red Hat Linux systems and HPE HPC clusters for the DARC program. Tasks include provisioning, integration, patching, user/account management, diagnostics, performance and reliability improvements, and collaboration with cybersecurity, software, hardware, and systems engineering teams. Participate in SkillBridge training pipeline for transitioning service members.

Lead design, deployment, maintenance, and troubleshooting of complex LAN/WAN and server infrastructures. Provide onsite customer support, manage Windows Server and Active Directory, virtualization (VMware), networking (switching, routing, VLANs, VPNs, wireless), email/DNS troubleshooting, backups, monitoring, and documentation. Mentor junior staff and design infrastructure projects aligned with best practices.

Manage and optimize Linux production environments, including server provisioning, lifecycle management, automation with scripting, and system compliance. Collaborate with stakeholders, monitor performance, and ensure security adherence while supporting multiple projects.

Lead administration and maintenance of servers, ensuring security, performance, and compliance. Optimize systems, conduct vulnerability remediation, and advise leadership on infrastructure risks.

The role involves managing HPC systems, administering Linux servers, utilizing container technologies, and supporting storage systems. The candidate must collaborate with teams and address infrastructure needs while ensuring system optimization.

This role involves supporting Linux-based systems, managing VMware VMs, ensuring security compliance, and providing 24x7 operational support.

Maintain and secure NerdWallets IT infrastructure: manage identity (Okta), endpoint (Jamf/Intune), cloud platforms (AWS/Azure/GCP), automate user lifecycle and operations, enforce SOX/compliance, build runbooks, and collaborate with Security, DevOps, and HR on infrastructure improvements and special projects.

Responsible for designing, implementing, and supporting the Operational Technology infrastructure, ensuring system stability, security, and overall performance management in coordination with application support teams.

The Senior Linux System Administrator will manage IT systems implementation, troubleshooting, and maintenance, providing Tier I and II support while ensuring reliability and performance of enterprise infrastructure.

Design, implement, and maintain enterprise-scale Windows Server and Active Directory infrastructures, endpoint and patch management, and identity/access controls. Provide architecture for Group Policy, SCCM/JAMF/Intune, cross-platform endpoint management, automation scripting, and compliance with NIST/CMMC. Support end users, coordinate patching, and ensure reliable IT operations for site mission systems.

Lead SAP BASIS administrator responsible for managing a 30+ system SAP landscape (ABAP and JAVA), providing technical guidance, performance tuning, upgrades, DR/backup, capacity planning, client copies, UNIX scripting, and mentoring junior admins while coordinating with functional, development, and infrastructure teams.

The Training System Administrator will manage and secure training server environments, ensure compliance with security regulations, and oversee performance monitoring and troubleshooting.

The Senior Windows System Administrator will administer systems in a Microsoft Windows and Linux environment, troubleshoot issues, maintain security, and support classified programs.

Manage and maintain payroll and timekeeping systems, ensure accurate full-cycle payroll processing and tax compliance, troubleshoot system issues, create reports/queries, lead system projects and enhancements, train staff, and support audits and year-end W-2 processes.

This role involves providing High Performance Computing administration in a mixed Windows and Linux environment, troubleshooting technical issues, and maintaining security compliance while mentoring junior team members.

The Senior System Administrator maintains enterprise system stability, manages configurations, enforces cybersecurity compliance, leads incident response, and supports change management processes.

The role involves system and network administration, implementation of IT solutions, and ensuring compliance with security protocols while maintaining critical services.

The Sr Applications Administrator manages application landscapes, troubleshoots issues, mentors staff, and ensures compliance with standards and security measures while also researching new technologies.

The Senior NetSuite Administrator will lead NetSuite architecture and governance, optimize financial processes, ensure data integrity, and manage integrations with other systems while mentoring junior staff.

Maintain and optimize multi-user computer systems: monitor CPU/disk/response times, perform systems security administration, create/manage accounts, install software, coordinate with network engineers, recommend/purchase hardware/software, provide backup/recovery, document systems, and develop policies under general supervision.

Responsible for the administration of MS Windows Servers and VMware environments, troubleshooting issues, supporting users, and managing product lifecycles.