# Senior Systems Administrator > STACK IT Recruitment · Toronto, Canada · Full-time · Posted 2026-08-17 **Salary:** CAD 90,000–120,000 **Workplace:** on_site **Department:** Vitality Solutions Inc ## Description Are you a hands-on Systems Administrator who enjoys solving complex infrastructure problems and working across a variety of client environments? We’re looking for a **Senior Systems Administrator** to join a growing 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**. The ideal candidate has strong infrastructure experience, is comfortable working directly with clients, and can take ownership of technical issues from troubleshooting through to resolution. 📍 **Work Type:**  - **Fully Onsite** - 5 days a week in-office or visiting client sites; on-call and after hours support when required   - **Location:** Toronto, ON   - **Work Type:** This is a newly created position ## Requirements 🎯 **What You’ll Do:**  - 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 ⭐ **What We’re Looking For:**  -  **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 ### Nice to Have - 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 - Nutanix or Microsoft certifications 🔥 **What Makes This Role Exciting?**  - **Technical Variety:** Work across virtualization, cloud, Microsoft 365, networking, and infrastructure - **Client Exposure:** Work directly with a diverse client base and become a trusted technical resource - **Hands-On Environment:** Take ownership of real infrastructure challenges and projects - **Technical Growth:** Continue developing your expertise across modern infrastructure and cloud technologies - **Leadership Opportunity:** Mentor junior technicians and play a key role in supporting the broader technical team ## Benefits - **Base Salary: $90,000 - $120,000** - Performance Bonus Eligibility   - Paid Time Off & Extended Health Benefits (Medical/Dental/Vision)  - Professional development, training, and certification opportunities   📩 **Ready to Elevate Your Career? Apply Now!**  At **STACK IT Recruitment**, we connect top talent with standout opportunities. If you meet at least 70% of the qualifications, we encourage you to apply, we’d love to chat!  **Know someone perfect for this role?** Share this with your network and help someone take the next step in their career.  ✨ We’re committed to diversity and inclusion. 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. ## Apply [Apply at STACK IT Recruitment](https://apply.workable.com/stack-it-recruitment/j/EFA357F05E/apply) --- Powered by [Workable](https://www.workable.com)