Engineer enterprise networks, cybersecurity, and cloud infrastructure at OSL Retail Services from the corporate office in Mississauga, Ontario.
As Senior Systems Engineer, you will manage corporate LAN, WAN, wireless, firewall, VPN, and cloud networking environments. The work includes Windows, Linux, Microsoft Azure, Fortinet infrastructure, and complex technology projects. You will design, implement, secure, troubleshoot, and evolve systems while supporting IT service improvement.
Key Responsibilities: Administer and harden Fortinet firewalls, switches, access points, and VPNs
Manage on-premises and Azure cloud infrastructure environments
Administer Windows, Linux, and Azure-based application servers
Monitor capacity, performance, security, and IT landscape changes
Document configurations, mappings,



processes, and problem management records
Requirements: Five or more years designing complex enterprise network environments
Expertise with firewalls, switches, access points, VPNs, and WAN solutions
Advanced Windows and Linux administration and troubleshooting experience
PowerShell, Bash, or Python scripting and automation experience
Microsoft Azure and Fortinet certifications strongly preferred
Apply senior network engineering expertise across Fortinet, Windows, Linux, Azure, cybersecurity, and enterprise infrastructure at OSL.

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📌 Senior Network Systems Engineer (Ontario)
🏢 OSL Retail Services
📍 Ontario