Top Senior System Administrator Jobs

Lead administration, configuration, security, and change governance for business systems (e.g., NetSuite, DAP). Act as senior escalation for complex issues, manage access controls and audits, coordinate integrations and data management, mentor administrators, and ensure changes and documentation follow best practices.

Provide system administration and sustainment for a complex, multi-domain, air-gapped environment: install and configure servers and applications, perform patching, vulnerability management, AD administration, virtualization support, hardware troubleshooting/reimaging, security management, documentation, and user communication to ensure continuous, secure operations.

Provide on-site systems administration and real-time support for ground systems used in flight operations, including account/configuration management, STIG compliance, equipment deployment, field integration, troubleshooting, testing, and coordination with Responsible Engineers and external partners. Support 24/5 operations, perform repairs on flightline and command-and-control systems, and assist with supplier data review and functional test requirements.

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.

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.

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.

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.

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.

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.