Network Engineer III

OnX Enterprise Solutions; Toronto; On-site; CAD 88,000 - 110,000; Full time

Job summary

A leading technology solution provider in Toronto is seeking a Senior Network Engineer to lead complex network projects and mentor junior engineers. The ideal candidate has over 7 years of experience in enterprise networking and holds a Cisco CCNP certification. Responsibilities include advanced troubleshooting, network design, and on-call support rotations. Competitive salary offered between CAD 88,000 and CAD 110,000 per year.

Qualifications

• 7+ years enterprise IT infrastructure networking experience.
• Proven experience in mission-critical, 24x7 environments.
• Mastery of troubleshooting tools like ping and traceroute.

Responsibilities

• Lead complex network design and implementation projects.
• Provide advanced troubleshooting and root cause analysis.
• Oversee documentation and operational procedures.

Skills

Advanced troubleshooting

Network design

Project execution

Cisco technologies

VPN setup

Firewall expertise

Education

Bachelor’s degree in a related field

Cisco CCNP certification

Network+ certification

Tools

Wireshark

Cisco ACI

Job description

OnX is a leading technology solution provider that serves businesses, healthcare organizations, and government agencies across Canada. OnX combines deep technical expertise with a full suite of flexible technology solutions—including Generative AI, Application Modernization, Managed Hybrid Cloud, Cybersecurity, Unified Communications, and Infrastructure solutions. From developing and deploying modern applications and the secure, scalable platforms on which they run, to managing, monitoring, and optimizing their operations, OnX delivers comprehensive technology solutions for its clients’ transformative business initiatives. For more information, please visit www.onx.com .

Job Purpose

The Network Engineer III serves as a senior technical resource within the OnX Canada infrastructure team. In addition to advanced troubleshooting, repair, and maintenance, this role leads network design, high-level architecture planning, and complex project execution. The Engineer III will serve as a subject matter expert, mentor junior engineers, and ensure customer networks operate at peak efficiency and security.

Essential Functions

• Lead complex network design, configuration, and implementation projects.
• Provide advanced troubleshooting and root cause analysis for critical issues.
• Oversee creation and maintenance of system documentation, diagrams, and operational procedures.
• Perform network capacity analysis and proactively plan upgrades or adjustments.
• Act as a technical escalation point for Network Engineers II and other team members.
• Participate in and lead on-call support rotations for critical incidents.
• Perform onsite work at customer locations and oversee vendor coordination.

Education

• Bachelor’s degree in a related field or equivalent experience.
• Cisco CCNP (required) or CCIE certification strongly preferred.
• Network+ certification.

Experience / Background

• 7+ years enterprise IT infrastructure networking experience.
• Proven experience in mission-critical, 24x7 high availability environments.
• Mastery of troubleshooting tools such as ping, traceroute, nslookup, dig, Wireshark.
• Advanced understanding of IP subnetting and variable length subnet masks.
• Expertise with dynamic routing protocols (BGP, OSPF, EIGRP, RIP) and longest-match qualifier concepts.
• Advanced experience with wireless controllers and access points administration and troubleshooting.
• Hands-on experience with Cisco ACI configuration and management.
• In-depth working knowledge of Cisco technologies: Catalyst, Nexus, Umbrella, Wireless, Catalyst Center, ISE, SNA.
• Strong experience setting up WAN connections, site-to-site VPNs, and client VPNs.
• Advanced knowledge of stateful and next-generation firewalls (Fortigate, Palo Alto, Cisco ASA, FTD+FMC, CheckPoint).
• Significant experience with hybrid or blended cloud/on-prem environments (AWS, Azure).

Special Knowledge / Skills

• Ability to design, review, and optimize enterprise-scale network architectures.
• Skilled in mentoring and leading technical teams.
• Strong documentation and communication abilities.
• Advanced vendor management and stakeholder engagement skills.
• Additional industry certifications (AWS, Microsoft) are a strong asset.
• ITIL certification preferred.

Due to U.S. Government requirements applicable to foreign-owned telecommunications providers, non-US citizens may be required to submit to an extensive government agency background check which will necessitate disclosure of sensitive Personally Identifiable Information.

The pay range for this role is:

88,000 - 110,000 CAD per year (Toronto Office - NOC)