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.Identity & Access Management
Administer and maintain Microsoft Entra IDManage user provisioning, deprovisioning, and lifecycle managementConfigure and maintain Single Sign-On (SSO) integrationsDesign and administer Conditional Access policiesManage Multi-Factor Authentication (MFA) technologiesAdminister external collaboration and B2B accessConduct identity governance reviews and access certificationsManage Microsoft licensing and group-based assignmentsMaintain role-based access controls and security standardsMicrosoft 365 Administration
Administer Microsoft 365 services including: Exchange Online Teams SharePoint Online OneDrive Power Platform Power BIManage retention and compliance policiesConfigure and maintain mail flow and transport rulesAdminister SPF, DKIM, and DMARC configurationsImplement and maintain Microsoft security controlsSupport tenant governance and security best practicesMonitor service health and platform performanceEvaluate and implement new Microsoft 365 capabilitiesEndpoint Management
Administer Microsoft IntuneManage Windows Autopilot deploymentsDevelop and maintain device compliance policiesManage application deployment and lifecycle managementOversee workstation configuration standardsManage endpoint patching and security updatesSupport remote workforce technologiesVoice & Collaboration
Administer Microsoft Teams Phone Support TouchPoint and related communication systemsTroubleshoot voice and collaboration issuesCoordinate with telecom and technology vendorsManage call routing, auto attendants, and user provisioningEnsure reliable collaboration services across the organizationInfrastructure & Security Support
core Windows infrastructure servicesParticipate in infrastructure modernization initiativesAssist with cloud and hybrid infrastructure administrationMaintain security baselines and operational standardsParticipate in security investigations and remediation effortsCreate and maintain system documentation, procedures, and standardsParticipate in disaster recovery and business continuity planningQualifications
7+ years of IT infrastructure and systems administration experience5+ years administering Microsoft 365 environmentsStrong experience with Microsoft Entra IDExperience implementing and supporting SSO and Conditional AccessExperience with Exchange Online, SharePoint Online, and TeamsExperience administering Microsoft Intune and Windows AutopilotStrong understanding of Microsoft licensing and tenant governanceExperience supporting cybersecurity and compliance initiativesStrong troubleshooting, analytical, and problem-solving skillsExcellent written and verbal communication skillsPreferred
Microsoft Certified: Identity and Access AdministratorMicrosoft Certified: Enterprise Administrator ExpertMicrosoft Certified: Security Administrator AssociateMicrosoft Certified: Endpoint Administrator AssociateExperience with Teams PhoneExperience with Power BI administrationExperience with Palo Alto Networks security solutionsExperience supporting mergers, acquisitions, or tenant migrationsExperience working in SaaS or software organizationsKnowledge of Azure services and cloud administrationSuccess Measures
The successful candidate will:Maintain a secure and compliant Microsoft 365 environmentEnsure timely onboarding and offboarding processesMaintain high endpoint compliance and patching standardsDeliver reliable collaboration and communication servicesImprove operational efficiency through automation and standardizationMaintain accurate documentation and governance processesSuccessfully assume and operate services transitioning from shared corporate IT functionsSalary Range (Ontario & BC Only)
The estimated base salary range for this role is CAD$90,000.00 - CAD$110,000.00 per year. We include salary ranges in job postings only where required by applicable pay transparency laws, based on the jurisdictions in which the role may be performed. The posted range is a good faith estimate and reflects factors that are subject to change. Final offer amounts may vary based on job-related factors, including work location, candidate experience and expertise, and other relevant considerations.We recognize the value and importance of diversity and inclusion in our communities and in the workplace. We celebrate diversity and one of our goals as an employer is to create an inclusive work environment for all employees. We are an equal opportunity employer and do not discriminate against any employee or applicant because of race, religion, sex, sexual orientation including gender identity or expression, pregnancy, national origin, age, marital status, veteran status, disability status, or any other category or characteristic protected by law.Perseus Group is an equal opportunity employer. All applicants will be considered for employment without attention to race, color, religion, sex, sexual orientation, gender identity, national origin, veteran, or disability status."We seek out vertical market software businesses where motivated small teams composed of good people, can produce superior results in tiny markets. What we offer our business unit managers is autonomy, an environment that supports them in mastering vertical market software management skills, and the chance to build an enduring and competent team in a ‘human-scale’ business" Mark Leonard President, Constellation Software Inc.Applicants with disabilities who would like to require a reasonable accommodation related to any part of the application process may contact us at View email address on ca.hrm.tc.
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