Senior Network Systems Engineer

Salary: $80,000 - 100,000 per year

Requirements:

• Significant hands-on experience operating and supporting ISP, telecommunications, carrier, or service-provider networks.
• Strong understanding of routing, switching, BGP, IP addressing, VLANs, firewalls, DHCP, DNS, network monitoring, and broader service-provider infrastructure.
• Experience configuring and troubleshooting Cisco routers and switches.
• Experience with Cisco ASR 1000 Series routers or equivalent service-provider routing platforms.
• Strong Linux administration background.
• Practical experience with FreeRADIUS or another RADIUS/AAA platform.
• Experience configuring and troubleshooting BGP in a live production environment.
• Experience with network monitoring and alerting tools such as Zabbix, PRTG, or similar platforms.
• Proven ability to work independently in a senior hands-on network or systems role.
• Experience producing technical documentation, operating procedures, standards, and network diagrams.
• Strong troubleshooting, analytical, organizational, and prioritization abilities.
• Ability to manage multiple operational issues and projects without losing track of follow-up work.
• Excellent written and verbal communication skills.
• Willingness and ability to respond to urgent after-hours issues when needed.
• Valid Ontario Class G drivers licence and the ability to attend network and customer locations across the Greater Toronto Area as required.
• Ability to work full-time from our Mississauga office; this is not a remote position.

Responsibilities:

• Operate, maintain, troubleshoot, and enhance our core and distribution networks and related systems.
• Own complex technical issues from investigation through resolution and documentation.
• Configure routers, switches, firewalls, servers, monitoring platforms, and other network infrastructure.
• Lead system builds, network upgrades, migrations, deployments, and infrastructure improvement initiatives.
• Identify opportunities to improve stability, performance, visibility, security, and operating costs.
• Evaluate existing systems independently, including inherited or partially documented configurations.
• Develop and maintain network diagrams, configuration records, operating procedures, technical standards, and troubleshooting guides.
• Create practical, repeatable processes for network operations, deployments, maintenance, and incident response.
• Act as the senior escalation point for outages, service issues, installations, technical support concerns, and deployment challenges.
• Serve as the primary on-call technical resource for network outages and other service-impacting infrastructure issues.
• Respond to outages at our downtown Toronto data centre and at distribution network locations across the condominium buildings we service in the Greater Toronto Area.
• Attend network sites outside normal business hours when issues cannot be resolved remotely.
• Provide on-site escalation support for complex customer-location issues when Field Services needs senior technical help.
• Assist with difficult installation or service issues when required, even though routine customer installations are not usually part of the role.
• Monitor infrastructure alerts and react to urgent service-impacting issues outside regular hours when needed.
• Review and audit network operations and technical support tickets to confirm issues are handled appropriately and on time.
• Plan and manage technical projects, priorities, maintenance work, and outstanding tasks.
• Provide technical guidance, mentoring, and training to Technical Support and Field Services teams.
• Support Field Services with complex installations, troubleshooting, and deployment challenges.
• Inspect network installations and configurations to ensure they meet our standards.
• Train technicians and support staff on new equipment, systems, and procedures.
• Oversee networking equipment inventory and help ensure sufficient spare equipment is available.
• Communicate clearly with management about incidents, risks, priorities, project status, and unresolved issues.
• Remain reachable by phone, email, and messaging platforms when operational support or escalation is reasonably required.

Technologies:

• Cisco
• Support
• Linux
• Network
• React
• Security
• Zabbix
• Asterisk
• Ethernet
• Nexus
• Windows

More:

Coextro is a growing Canadian Internet Service Provider offering a senior, hands-on network and systems engineering role with significant autonomy and visible impact. We operate as a small, fast-moving ISP, so this position is broad and practical rather than narrowly specialized, with direct ownership of network operations, system builds, infrastructure improvements, and complex escalations. The role is based in our Mississauga office, is in person, and involves work across a wide range of networking, systems, access, monitoring, and telecommunications technologies. We offer a salary of $80,000 to $100,000 per year, along with benefits including casual dress, company events, dental care, extended health care, on-site parking, paid time off, and vision care. There are also opportunities for professional growth, increasing responsibility, and helping shape the technical standards, documentation, and processes that support our next stage of development.

last updated 40 week of 2026