Join a Global Leader. Help Build the Future of IT/OT Infrastructure.

Our client is a Canadian company with a global presence and a growing technology team. As their operations continue to expand, they are looking for an experienced IT/OT Senior Systems Administrator to play a key role in supporting, securing, and modernizing their technology infrastructure.

This is an opportunity to join a dynamic, collaborative environment where your expertise will directly contribute to the reliability, security, and evolution of critical IT and OT systems.

The Opportunity

You will design, administer, optimize, and support a hybrid on-premises and cloud environment, ensuring a highly available, secure infrastructure across corporate and operational sites.

Key areas of responsibility include:

- Manage Windows Server, Active Directory, Microsoft Entra ID, Microsoft 365 and Azure environments.
- Administer and optimize VMware and Hyper-V virtualization , including servers, storage, and capacity planning.
- Support enterprise networking, DNS, DHCP, VPN, VLANs and connectivity .
- Manage backup, disaster recovery, business continuity and infrastructure monitoring .
- Support Exchange, SQL Server, Intune and enterprise applications .
- Implement patching, vulnerability remediation, security baselines and identity/access controls .
- Provide Tier-3 technical support and lead complex infrastructure troubleshooting.
- Partner with internal teams,



vendors and managed service providers to deliver reliable technology solutions.
- Contribute to cloud adoption, infrastructure modernization and automation initiatives .
- Provide occasional onsite support at corporate and operational locations.

What You Bring

- 5+ years of enterprise systems administration or infrastructure experience.
- Strong hands-on expertise with Windows Server, Active Directory, Entra ID, VMware/Hyper-V and Microsoft 365 .
- Experience with Azure, virtualization, storage, backup and disaster recovery .
- Solid networking knowledge across TCP/IP, DNS, DHCP, VLANs, routing, switching and VPNs .
- Strong PowerShell scripting and automation skills.
- Excellent troubleshooting, communication and problem-solving abilities.
- A collaborative, ownership-driven approach and the ability to work across both IT and OT environments .

Assets: Linux administration, OT/HMI environments, Palo Alto, Cisco or HPE/Aruba technologies, and relevant Microsoft, VMware or Veeam certifications.

Why Join?

- Join a Canadian global leader with continued growth and investment in technology.
- Be part of a agile team working at the intersection of IT, OT, cloud and cybersecurity.
- Make a direct impact on critical infrastructure and operational excellence.
- Chance to contribute to modernization and transformation initiatives, not just day-to-day administration.
- Work alongside talented professionals in a collaborative and evolving environment.

📌 IT/OT Senior Systems Administrator (Toronto)
🏢 Krissilas Group
📍 Toronto