Senior Systems Administrator – M365 & Infrastructure

Job summary

The Senior Systems Administrator will manage the Microsoft 365 environment, including identity and access management, endpoint security, and collaboration platforms. They will also oversee infrastructure modernization and ensure secure, scalable technology services across the organization.

Job details

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 Teams Phone Experience with Power BI administration Experience with Palo Alto Networks security solutions Experience supporting mergers, acquisitions, or tenant migrations Experience working in SaaS or software organizations Knowledge of Azure services and cloud administration Success Measures The successful candidate will: Maintain a secure and compliant Microsoft 365 environment Ensure timely onboarding and offboarding processes Maintain high endpoint compliance and patching standards Deliver reliable collaboration and communication services Improve operational efficiency through automation and standardization Maintain accurate documentation and governance processes Successfully assume and operate services transitioning from shared corporate IT functions Salary 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. Applicants with disabilities who would like to require a reasonable accommodation related to any part of the application process may contact us at Perseus_HR@constellationhbs.com. #LI-DY1 #HB HO

What you’ll do

The Senior Systems Administrator will manage the Microsoft 365 environment, including identity and access management, endpoint security, and collaboration platforms. They will also oversee infrastructure modernization and ensure secure, scalable technology services across the organization.

Requirements

Candidates must have at least 7 years of IT infrastructure experience, with 5 years specifically in Microsoft 365 administration. Proficiency in Microsoft Entra ID, Intune, and security governance is essential for this role.

Listed skills

• Power BI · Preferred
• Microsoft Teams · Preferred
• Conditional Access · Preferred
• Microsoft 365 · Preferred
• Troubleshooting · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

• Microsoft 365
• Microsoft Entra ID
• Identity and Access Management
• Microsoft Intune
• Windows Autopilot
• Exchange Online
• SharePoint Online
• Microsoft Teams
• Conditional Access
• Endpoint Management
• Security Governance
• Power Platform
• Power BI
• Infrastructure Administration
• Troubleshooting
• Security Investigations
• Operational Efficiency
• Workplace Inclusivity
• Microsoft 365 Certified Administrator Expert
• Microsoft Licensing
• Cloud Administration
• Security Solutions
• Office 365 Exchange Online
• Microsoft Power Platform
• IT Infrastructure
• Application Deployment
• Access Controls
• Mergers And Acquisitions
• Microsoft Defender Antivirus
• Automation
• Microsoft Azure
• Business To Business
• Telecommunications
• Business Continuity Planning
• Software As A Service (SaaS)
• Software Documentation
• Collaborative Software
• Communication
• Information Technology
• Cyber Security
• System Administration
• Disaster Recovery
• Domainkeys Identified Mail
• Multi-Factor Authentication
• Governance
• Leadership
• Scalability
• Identity And Access Management
• Problem Solving
• IT Service Management

Job areas

• Technology
• Software
• Security & Safety
• Administrative
• Infrastructure Systems Administrator
• Systems Administrator
• Systems Aministrators
• Network and Computer Systems Administrators

More jobs from Perseus Group, Constellation Software