Position Summary
Constellation HomeBuilder Systems is seeking a Senior Systems Administrator / M365 & Infrastructure Administrator to join our Information Technology team in Markham, Ontario.
This role will be responsible for the administration, security, governance, and strategic operation of our Microsoft 365 environment, Microsoft Entra ID platform, endpoint management systems, and collaboration technologies. The position will own technology services and responsibilities transitioning from shared corporate IT services as part of our integration with Jonas.
The successful candidate will serve as a senior technical resource responsible for identity and access management, Microsoft 365 administration, endpoint management, collaboration platforms, security governance, and infrastructure support. This individual will work closely with leadership, business stakeholders, and external vendors to ensure secure, reliable, and scalable technology services across the organization.
Primary Responsibilities
Identity & Access Management
Administer and maintain Microsoft Entra ID
Manage user provisioning, deprovisioning, and lifecycle management
Configure and maintain Single Sign-On (SSO) integrations
Design and administer Conditional Access policies
Manage Multi-Factor Authentication (MFA) technologies
Administer external collaboration and B2B access
Conduct identity governance reviews and access certifications
Manage Microsoft licensing and group-based assignments
Maintain role-based access controls and security standards
Microsoft 365 Administration
Administer Microsoft 365 services including:
Exchange Online
Teams
SharePoint Online
OneDrive
Power Platform
Power BI
Manage retention and compliance policies
Configure and maintain mail flow and transport rules
Administer SPF, DKIM, and DMARC configurations
Implement and maintain Microsoft security controls
Support tenant governance and security best practices
Monitor service health and platform performance
Evaluate and implement new Microsoft 365 capabilities
Endpoint Management
Administer Microsoft Intune
Manage Windows Autopilot deployments
Develop and maintain device compliance policies
Manage application deployment and lifecycle management
Oversee workstation configuration standards
Manage endpoint patching and security updates
Support remote workforce technologies
Voice & Collaboration
Administer Microsoft Teams Phone
Support TouchPoint and related communication systems
Troubleshoot voice and collaboration issues
Coordinate with telecom and technology vendors
Manage call routing, auto attendants, and user provisioning
Ensure reliable collaboration services across the organization
Infrastructure & Security
Support core Windows infrastructure services
Participate in infrastructure modernization initiatives
Assist with cloud and hybrid infrastructure administration
Maintain security baselines and operational standards
Participate in security investigations and remediation efforts
Create and maintain system documentation, procedures, and standards
Participate in disaster recovery and business continuity planning
Qualifications
Required
7+ years of IT infrastructure and systems administration experience
5+ years administering Microsoft 365 environments
Strong experience with Microsoft Entra ID
Experience implementing and supporting SSO and Conditional Access
Experience with Exchange Online, SharePoint Online, and Teams
Experience administering Microsoft Intune and Windows Autopilot
Strong understanding of Microsoft licensing and tenant governance
Experience supporting cybersecurity and compliance initiatives
Strong troubleshooting, analytical, and problem-solving skills
Excellent written and verbal communication skills
Preferred
Microsoft certifications such as:
Microsoft Certified: Identity and Access Administrator
Microsoft Certified: Enterprise Administrator Expert
Microsoft Certified: Security Administrator Associate
Microsoft Certified: Endpoint Administrator Associate
Experience with…