Top Senior System Administrator Jobs

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

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 maintaining and securing enterprise Windows Server, virtualization (Hyper-V), storage (SAN), networking (firewalls, switches, wireless, VPN/WAN), Microsoft 365/Azure services, and automation via PowerShell. Serves as senior escalation, leads troubleshooting, participates in DR planning, mentors junior staff, and supports infrastructure projects and security controls.

The Senior System Administrator will manage IT systems' implementation, troubleshooting, and maintenance while overseeing daily operations, providing support, and optimizing system performance.

The Senior System Administrator will manage IT systems in Windows and Linux environments, troubleshoot technical issues, and ensure security compliance.

Senior System Administrator providing VDI expertise and leadership on a DISA contract supporting JWICS at Ft Meade. Acts as VDI SME, leads onboarding of enclaves, handles major outage escalations, evaluates vendors, develops policies and SOPs, applies security settings, documents systems, and mentors junior staff.

Provide Tier 1/2 Site Reliability Engineering support with deep expertise in AKS and VDI (AVD). Serve as technical escalation, mentor junior staff, troubleshoot complex cloud infrastructure and containerized applications, lead incident resolution, and ensure system reliability and observability.

Support and sustain mission-critical ICAM environments: build and deploy Docker containers in Kubernetes, integrate applications and directories, maintain high-availability services, monitor and troubleshoot systems, perform patching and configuration management, document procedures, and provide occasional after-hours support.

Provide 24/7 systems administration and incident response for US BICES-X. Administer VMware virtual environments, Windows Server and Microsoft stack (Exchange, SharePoint, SQL), SCCM, AD, and VDI. Implement DISA security policies, develop automation scripts, maintain system documentation, and support infrastructure design, monitoring, and performance tuning.

Provide 24/7/365 on-site Tier 1/2 mission support: monitor systems with SolarWinds/Splunk/Wireshark, triage hardware/software/network faults, support Layer 1-3 networking, respond to mission-critical incidents, perform checks and testing, maintain SOPs and configuration management using BMC Remedy.

Responsible for supporting server and desktop operating systems, virtualization, storage management, and hardware troubleshooting. Leadership and communication skills are essential.

This role involves providing senior-level technical leadership for Windows-based server environments, including architecture, administration, troubleshooting, and managing infrastructure projects.

Provide systems administration for classified Microsoft Windows and Red Hat Enterprise Linux environments, managing AD, DNS, DHCP, virtualization (VMware), storage (RAID/NAS/SAN), backup/recovery, and security. Collaborate with cybersecurity teams, document and train on IT processes, support 24x7 operations, and obtain DoD 8140/8570 certification (Security+ CE) within six months. Occasional domestic travel (up to 10%).

Senior System Administrator to design, modernize, secure, and sustain enterprise applications and platforms. Responsibilities include IAVA patching/reporting, Windows and Linux server administration, patching and upgrades, GPO management, PowerShell scripting, AWS infrastructure (EC2, Lambda, CloudFormation), and automation using Ansible and Terraform to improve reliability and streamline operations.

Maintain and support the agency's HPC infrastructure and development environment: administer large-scale Linux clusters, automate provisioning and patching, manage storage and networking, troubleshoot issues, implement IaC, and ensure security compliance and accreditation.

Provide remote scientific computing system administration for NIH NIAID NEAT: account provisioning, access control, software deployment, backup validation, infrastructure sustainment, configuration and operation of systems, capacity planning, user support, and compliance (including FISMA/system authorization). Support HPC and scientific instrumentation; supervise daily system operations.

The Mid/Sr System Administrator will support system administration for a complex network, ensuring optimal performance and security management while troubleshooting issues and managing system deployments.

Responsible for IT systems administration in a Microsoft Windows and Linux environment, resolving technical problems, and maintaining security clearance.

Responsible for the design, deployment, and maintenance of Linux/UNIX server systems and software, with virtualization and project support responsibilities.

The Senior System Administrator will evaluate system specifications, install and configure enterprise systems, and provide operational support, ensuring systems security and functionality while managing network performance and hardware requirements.

Provide advanced systems administration for hybrid Windows and Linux enterprise environments (on-prem and AWS). Perform IAVA patching, vulnerability remediation, OS maintenance, software lifecycle support, automation (PowerShell, Terraform, Ansible), IaC, cloud administration (EC2, Lambda, CloudFormation), GPO management, troubleshooting, documentation, and cross-team collaboration to ensure security and availability of mission-critical systems.

Provide combat system simulation support, implement network solutions, and maintain accreditation for Government wide area network usage.

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.

Provide onsite systems administration for Windows and Red Hat Enterprise Linux environments, manage DNS/DHCP/AD and server replication, troubleshoot OS and hardware integration issues, maintain virtualization and storage solutions, and meet DoD 8140/8570 certification requirements. Must hold active transferable Secret clearance.

Lead Windows systems administration for a DoD program: manage AD/GPO/DNS/DHCP, VMware virtualization, DISA STIG compliance, automation with PowerShell, ELK logging, enterprise storage, and mentor junior staff while ensuring high availability and security.