Position: Systems Administrator III - Windows
Location: Etobicoke - 3 days onsite
Salary: $100,000 + 10% bonus
Posting Type: Open vacancy
Our client is looking for an experienced Systems Administrator III to support and maintain mission-critical Windows Server infrastructure across enterprise on-premises and hybrid cloud environments.
This is a hands-on, server-focused role responsible for Windows Server administration, SCCM patching, platform upgrades, high-availability clustering, production troubleshooting and infrastructure automation. The successful candidate will work closely with Infrastructure, Engineering, Security and SQL DBA teams to maintain reliable and secure production environments.
Description Build, deploy, patch, upgrade and manage enterprise Windows Server environments.
Administer Active Directory, DNS and Group Policy.
Perform hands-on SCCM server patching and lifecycle management.
Drive platform currency, patching and in-place server upgrades.
Support and troubleshoot multi-node Microsoft Windows clusters.
Support SQL Server high-availability environments and work closely with SQL DBAs.
Resolve complex production incidents through advanced troubleshooting and root cause analysis.
Develop PowerShell automation to improve infrastructure operations.
Maintain runbooks, documentation and operational standards.
Collaborate with Infrastructure, Engineering, Application, Security and DBA teams.
Support ongoing infrastructure modernization and lifecycle initiatives.




Skills 3+ years of hands-on Windows Server administration in an enterprise environment.
Strong experience building, deploying, patching and managing Windows Servers.
Hands-on SCCM experience specifically focused on server patching - not EUC.
Strong Active Directory, DNS and Group Policy experience.
Experience supporting multi-node Microsoft/Windows clustering and high-availability environments.
Experience supporting SQL Server high availability.
Strong PowerShell scripting and infrastructure automation experience.
Solid production troubleshooting and root cause analysis skills.
Ability to independently manage and resolve complex server infrastructure issues.
Strong enterprise/server administration background.
Nice to Have Azure and hybrid cloud experience
Ansible or similar configuration management experience
VMware virtualization experience
Experience with PCI DSS, CIS benchmarks or payment-processing environments
Experience working with MSSPs or managed security monitoring environments
Relevant infrastructure or security certifications
Important This is a server-focused Windows administration role. Candidates should have strong enterprise Windows Server experience, including SCCM server patching and multi-node/high-availability clustering.
EUC-focused candidates and generalist IT profiles are not the target for this position.
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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📌 Systems Administrator III (Windows) (Ontario)
🏢 Quantum Management Services
📍 Ontario