Senior Network Security Engineer, Network Data Position Type:

Location:

Mississauga, ON (Hybrid: 2–3 days onsite per week Must be eligible to work in Canada Clearance: Must be eligible for Government of Canada Protected B clearance (requires living in Canada for approximately the last 5 years) Roles and responsibilities We are seeking a versatile Senior Network Security Engineer, Network Data to support critical enterprise infrastructure initiatives, centered on an active, large-scale data centre migration. In this role, you will play a hands-on technical lead role translating and migrating hundreds of firewall configurations from legacy platforms to next-generation appliances, while supporting core enterprise LAN/WAN operations. The ideal engineer thrives across the entire network stack, is comfortable wearing multiple hats, and brings proven experience executing data center migrations with automation.

Key Responsibilities

- Data Centre & Firewall Migration: Lead the translation, validation, and deployment of configurations migrating approximately 500 firewalls from Cisco to Fortinet.

- Traffic Management & Security Implementation: Build, maintain, and optimize F5 BIG-IP traffic management solutions, including custom iRule programming.

- Network Automation: Develop and execute Ansible playbooks and Python scripts to streamline configuration deployments, testing, and operational tasks.

- Operations & Tier 2/3 Support: Provide senior-level escalation support for enterprise routing, switching,

Discover more

Browse Reference

Learn a Language

Find Stock Photos

and firewall incidents; isolate complex Layer 1–7 issues.

- Security & Change Execution: Implement approved security directives (firewall rules, IP/subnet filtering, VPN policies) and execute planned changes during scheduled maintenance windows.

- Documentation & Standards: Maintain precise network topologies, operational runbooks, and migration mapping records. Required Technical Competencies

- Fortinet / FortiGate (Must-Have): Deep, hands-on engineering, configuration, policy mapping, and operational experience.

- Cisco Firewalls & Enterprise Networking: Proven track record managing Cisco firewall appliances in a migration context, alongside solid routing and switching expertise (OSPF, BGP, LAN/WAN).

- F5 BIG-IP: Strong, practical experience with Local Traffic Manager (LTM) and hands-on iRule development.

- Automation & Scripting: Demonstrated proficiency writing and running Ansible playbooks; working ability to read and maintain Python scripts.

- Data Centre Migration Track Record: Prior experience actively planning and executing data centre migrations in an enterprise environment. Qualifications & Working Conditions

-

Experience:

8+ years of enterprise networking, firewall administration, and infrastructure delivery experience.

- Versatility: Comfortable tackling issues across the full technology stack with minimal ramp-up time.

- Availability: Open to occasional evening/weekend maintenance windows for project cutovers.

- Certifications (Asset): CCNP, CCIE, NSE 4+, or F5-CTS.

- Cloud Knowledge (Asset): Familiarity with hybrid connectivity involving Azure or AWS environments.

📌 Senior Network Security Engineer (Mississauga)

🏢 Randstad Digital

📍 Mississauga