Systems Administrator III (Windows)

Quantum Management Services Ltd.; Toronto; On-site; CAD 90,000 - 110,000; Full time

Job summary

Quantum Management Services Ltd. is seeking an experienced Systems Administrator III to support and maintain mission-critical Windows Server infrastructure across on-premises and hybrid cloud environments.

The role is hands-on, server-focused, with responsibilities including SCCM patching, platform upgrades, high-availability clustering, production troubleshooting, and infrastructure automation. Collaboration with Infrastructure, Engineering, Security and SQL teams is key.

Qualifications

• 3+ years of hands-on Windows Server administration in an enterprise environment.
• Strong experience with SCCM patching and server lifecycle management.
• Proficient in Active Directory, DNS and Group Policy administration.
• Experience supporting multi-node Windows clusters and SQL Server HA.
• PowerShell scripting and infrastructure automation capability.

Responsibilities

• 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

Windows Server

SCCM patching

Active Directory

DNS

Group Policy

PowerShell

Troubleshooting

HA clustering

Automation

SQL Server HA

Job description

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.
• Strong 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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