Top Senior System Administrator Jobs

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.

Maintain and operate production, dev, and test web environments; execute deployments, patching, security hardening, monitoring, and incident resolution. Develop and run CI/CD pipelines and automation scripts, support containers and cloud infrastructure, and collaborate on feature previews and user training to support a cybersecurity SaaS platform.

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.

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.

Lead LogiCole system administration for Air Force DMLSS: manage a system administration team, oversee project management, technical support, QA, staffing, scheduling, reporting, and risk. Provide hands-on administration, monitor servers and fiscal processes, support electronic catalogs and strategic sourcing, and protect confidential information.

Design, defend, and implement enterprise Kubernetes infrastructure to support GitLab and Jenkins CI/CD across Development, Test, Staging, and Production. Harden, configure, and network clusters; manage deployments using ConfigMaps, Secrets, Security Contexts and Ingress TLS termination. Use Configuration as Code (Ansible/Puppet/Chef), support AWS/Azure, mentor engineers, and present architecture to the DevSecOps Review Board.

Administer and optimize KIPP NYC's Salesforce platform for recruitment, enrollment, marketing, and advancement. Manage users, permissions, objects, automation, reports/dashboards, integrations (e.g., PowerSchool), and data quality. Provide Tier 1 support, training, documentation, and stakeholder partnership to streamline workflows, improve adoption, and enable data-informed decision-making across schools and central teams.

Lead and sustain large-scale HPC systems supporting NOAA/NWS forecasting. Manage scheduler/software stack (PBS Pro/Slurm), optimize performance and throughput, troubleshoot multi-node Linux clusters, develop scripts, and support 24/7 operations with occasional travel and on-call duties.

Manage, configure, and secure classified and unclassified systems in TS/SCI environments. Administer user accounts and access controls, monitor performance and security, implement hardening and STIG compliance, perform patch management, support RMF/ATO and continuous monitoring, troubleshoot hardware/software/network issues, coordinate incident response, maintain documentation and backups, and provide technical guidance to stakeholders.

Design, build, and maintain automated CI/CD/DevSecOps pipelines for cloud and on-prem microservices. Automate integration, deployment, scaling, monitoring, and security scans. Troubleshoot infrastructure and deployments, implement security controls for Federal/DoD systems, and collaborate with development and product teams to optimize delivery and compliance.

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

Manage and maintain enterprise outbound dialer systems (Alvaria/Noble), ensure performance and compliance, troubleshoot production issues, integrate with CRM/voice infrastructure, run SQL-based analysis, support upgrades, and provide after-hours/business continuity support.

Senior UNIX Systems Administrator responsible for troubleshooting and resolving complex production issues across AIX, HP-UX, and Solaris environments. Duties include storage, clustering, networking, virtualization, performance tuning, patching, disaster recovery, maintaining UNIX lab environments, occasional onsite work, and participating in a low-frequency on-call rotation while working directly with enterprise customers.

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.

Administer and secure RHEL and Windows servers/workstations, implement STIG/SCAP hardening, manage patches/packages and backups, support virtualization (VMware, containers, OpenShift/K8s), troubleshoot hardware/software and networking, document configurations, provide operational support, and participate in automation and modernization efforts for defense-focused OPIR processing systems.

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

The role involves administration and maintenance of Windows-based servers, applying security updates, monitoring system performance, and supporting end-user IT automation, applicable for both Senior and Junior levels.

Administer and maintain Windows and Red Hat Linux systems for classified programs, including server/storage management, authentication/AD, backup/restore, software installs, troubleshooting, cybersecurity coordination, and occasional off-hours support. Ensure systems meet DoD security requirements and obtain required certification.

Lead design, implementation, administration and optimization of Oracle EBS R12 databases on Exadata. Ensure availability, performance, backup/recovery, security, automation, cloning, monitoring (OEM), and DR. Provide technical leadership, documentation, runbooks, on-call support, cross-team coordination, and mentor other DBAs while driving automation and architecture reviews.

Lead enterprise system administration including server management, updates, monitoring, patching, and STIG compliance. Provide Tier I/II technical support, hardware/software installation and troubleshooting, Active Directory and virtualization administration, and maintain security and configuration baselines.

Responsible for supporting ERP system users, troubleshooting issues, training, optimizing processes, and ensuring system efficiency and data integrity.

As a Senior AWS DevOp and System Administrator, you'll design, deploy, and maintain reliable infrastructure on AWS, ensuring optimal performance and security while collaborating in an agile team.