Position: Senior Windows System Administrator
Location: Etobicoke
Compensation: $115K-$125K
Job Type: Permanent
Posting Type: Open vacancy
Hybrid Requirement: 3 days in Etobicoke
Role Overview We are seeking a Senior Systems Administrator to manage, maintain, and enhance enterprise Windows and Linux server infrastructure. This role will focus on server administration, patching, automation, vulnerability remediation, troubleshooting, cloud infrastructure, and high-availability environments across physical and virtual platforms.
Responsibilities Manage and maintain Windows and Linux server environments, including server builds, configuration, upgrades, decommissioning, clustering, and ongoing production support.
Own enterprise patching and vulnerability remediation, using tools such as SCCM, Ansible, and vulnerability management platforms to ensure servers remain secure, compliant, and up to date.
Troubleshoot complex infrastructure issues across operating systems, virtualization, storage, networking, applications, and cloud environments, performing root-cause analysis and implementing sustainable solutions.
Automate infrastructure operations using Ansible, PowerShell, Bash, or similar scripting and configuration-management technologies to reduce manual effort and improve operational efficiency.




Support cloud and virtualization environments, including Azure, AWS, VMware, disaster recovery, high availability, and server migrations, while maintaining strong documentation, change management, and ITIL practices.
Qualifications 8+ years of hands-on systems administration experience, with strong expertise supporting enterprise Windows Server and/or Linux/RHEL environments.
Strong experience with server patching, hardening, vulnerability remediation, SCCM, Ansible, and infrastructure automation.
Advanced troubleshooting skills with experience resolving complex production incidents, performing root-cause analysis, and supporting high-availability and clustered environments.
Hands-on experience with VMware and cloud platforms such as Azure or AWS, including server provisioning, migration, maintenance, and decommissioning.
Solid knowledge of Active Directory, DNS, DHCP, PowerShell/Bash, networking, cybersecurity, change management, and disaster recovery, with excellent documentation and communication skills.
All applications are reviewed by our recruitment team, and hiring decisions are made by people. We may also use AI-enabled tools to support parts of the application review process.

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📌 Senior Systems Administrator (Ontario)
🏢 Quantum Technology Recruiting Inc. (QTR)
📍 Ontario