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About the Role
We are seeking a Senior Systems Administrator to join a managed IT services provider supporting clients across the Greater Toronto Area. This is a hands-on role with a strong focus on virtualization, Microsoft 365, Azure, and networking, requiring strong infrastructure experience and client interaction skills.
Responsibilities
- Manage and troubleshoot virtualized infrastructure, including Nutanix HCI environments
- Administer and support Microsoft 365 environments, including Exchange Online, SharePoint, Teams, OneDrive, and user/license management
- Support Azure and Entra ID environments, including hybrid identity and cloud infrastructure
- Configure, maintain, and troubleshoot network infrastructure, including LAN/WAN, VLANs, firewalls, VPNs, and Wi-Fi
- Serve as a senior escalation point for complex technical issues and Level 1/2 tickets
- Support server, endpoint, operating system, and infrastructure-related issues across client environments
- Lead and support infrastructure projects, including migrations, upgrades, and implementations
- Monitor system health and proactively identify and resolve potential issues
- Maintain accurate technical documentation, network diagrams, and infrastructure standards
- Work directly with clients and vendors to resolve technical issues and deliver solutions
- Provide technical guidance and mentorship to junior technicians
- Apply security best practices across client systems and infrastructure
Requirements
- 5+ years of experience in Systems Administration, Infrastructure Engineering, or a similar role
- Experience working within an MSP, managed services, or multi-client environment
- Hands-on experience administering Nutanix HCI, including cluster management and AHV/VM administration
- Strong experience administering Microsoft 365, including Exchange Online, SharePoint, Teams, and OneDrive
- Experience with Azure and Microsoft Entra ID, including hybrid environments
- Solid understanding of networking, including LAN/WAN, VLANs, firewalls, VPNs, and routing
- Experience with Windows Server and on-premises Active Directory
- Experience with RMM and PSA platforms; HaloPSA and NinjaOne are an asset
- Strong troubleshooting and problem-solving skills
- Experience mentoring, coaching, or providing technical direction to junior technicians
- Strong client-facing communication skills and the ability to work with both technical and non-technical stakeholders
- Strong organizational skills and the ability to manage multiple client environments and competing priorities
- Cybersecurity experience from a systems/infrastructure administration perspective
- Experience with SentinelOne, Microsoft Defender, or other EDR/MDR platforms
- FortiGate or other firewall experience
- Microsoft 365 security experience, including Conditional Access, MFA, Intune, and DLP
- Experience with infrastructure migrations to Azure/Microsoft 365
- ITIL Foundation or working knowledge of ITIL practices
- Experience supporting law firms or professional services organizations
- Experience with operational technology (OT), building automation, or commercial property environments
Skills
- Nutanix HCI
- Microsoft 365
- Azure
- Entra ID
- Networking
- LAN/WAN
- VLANs
- Firewalls
- VPNs
- Wi-Fi
- Windows Server
- Active Directory
- RMM platforms
- PSA platforms
- Troubleshooting
- Problem-solving
- Client-facing communication
- Organizational skills
- Cybersecurity
- SentinelOne
- Microsoft Defender
- EDR platforms
- MDR platforms
- FortiGate
- Conditional Access
- MFA
- Intune
- DLP
- ITIL
Location
- Toronto, ON
Work Type
- Fully Onsite
- On-call
- After hours support
Experience Level
- Senior
- 5+ years
Education Level
- Nutanix certifications
- Microsoft certifications
Salary/Compensations
- $90,000 - $120,000
- Performance Bonus Eligibility
Benefits
- Paid Time Off
- Extended Health Benefits (Medical/Dental/Vision)
- Professional development, training, and certification opportunities
About the Company
- At STACK IT Recruitment, we connect top talent with standout opportunities.
- We’re committed to diversity and inclusion.
Equal Opportunity
- Need accommodation during the hiring process? Let us know, we’re here to support you!
- AI Use Disclosure: STACK IT uses AI-enhanced tools to support initial candidate screening and interview note analysis. All assessments and hiring decisions remain human-led.