Senior Systems Administrator

Quantum Technology Recruiting Inc. (QTR); Toronto; Hybrid; CAD 115,000 - 125,000; Full time

Job summary

Quantum Technology Recruiting Inc. (QTR) is seeking a Senior Windows System Administrator in Etobicoke to manage enterprise Windows and Linux server infrastructures. The role covers patching, automation, vulnerability remediation, and high-availability environments across physical and virtual platforms.

Responsibilities include patching, troubleshooting, and cloud/VMware support with ITIL-aligned change management. The position offers a hybrid work arrangement requiring 3 days in Etobicoke.

Qualifications

• 8+ years of hands-on systems administration experience in enterprise Windows and Linux environments.
• Strong experience with patching, hardening, and vulnerability remediation (SCCM, Ansible).
• Experience with virtualization, cloud platforms, and high-availability environments.

Responsibilities

• Manage and maintain Windows and Linux server environments, including builds, configuration, upgrades, decommissioning, clustering, and production support.
• Own enterprise patching and vulnerability remediation using SCCM, Ansible, and vulnerability platforms.
• Troubleshoot complex infrastructure issues across OS, virtualization, storage, networking, applications, and cloud environments; perform root-cause analysis.

Skills

Windows Server

Linux/RHEL

SCCM

Ansible

PowerShell

Bash

VMware

Azure

AWS

Active Directory

Networking

ITIL

Job description

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.
• Strong 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.