Senior Systems Administrator (M365/Infrastructure)

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…