Senior Network & Systems Specialist

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

Requirements:

• Significant hands-on experience supporting ISP, telecommunications, carrier, or service-provider networks
• Strong knowledge of routing, switching, BGP, IP addressing, VLANs, firewalls, DHCP, DNS, network monitoring, and service-provider infrastructure
• Experience configuring and troubleshooting Cisco routers and switches, including Cisco ASR 1000 Series or comparable service-provider routing platforms
• Strong Linux administration experience
• Practical experience with FreeRADIUS or another RADIUS/AAA platform
• Experience configuring and troubleshooting BGP in a production environment
• Experience with network monitoring and alerting platforms such as Zabbix, PRTG, or similar
• Ability to work independently in a senior, hands-on network or systems role
• Experience creating technical documentation, operating procedures, standards, and network diagrams
• Strong troubleshooting, analytical, organizational, prioritization, and communication skills
• Ability to manage multiple operational issues and projects while tracking follow-up work
• Ability and willingness to respond to urgent after-hours issues when required
• Valid Ontario Class G drivers licence and ability to travel to network and customer locations across the Greater Toronto Area as required
• Ability to work full-time on-site from our Mississauga office; this is not a remote position
• English proficiency
• Experience with one or more of the following is an asset: Cisco Catalyst, Small Business, or Nexus switches; Cisco ASR 1000 or ASR 9000 routers; PPPoE, L2TP, subscriber management, or ISP access networks; FreeRADIUS and subscriber authentication; ISC DHCP Server; Linux, Windows Server, or FreeBSD; Zabbix or PRTG; Sandvine ActiveLogic; Juniper NetScreen firewalls; 3CX, Asterisk, or FreePBX; Ubiquiti EdgeRouters, switches, or Wi-Fi systems; VoIP and SIP infrastructure; fibre, Ethernet, or fixed-access network deployments

Responsibilities:

• Operate, maintain, troubleshoot, and improve our core and distribution networks and related systems
• Take ownership of 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 projects
• Identify and address opportunities to improve network stability, performance, visibility, security, and operating costs
• Assess existing systems, including inherited or incompletely documented configurations
• Develop and maintain network diagrams, configuration records, operating procedures, technical standards, and troubleshooting documentation
• Establish repeatable processes for network operations, deployments, maintenance, and incident response
• Act as the senior escalation point for outages, service issues, installations, support issues, and deployment challenges
• Serve as the primary on-call technical resource for outages and other service-affecting infrastructure issues
• Respond to outages at our downtown Toronto data centre and distribution network locations in condominium buildings across the Greater Toronto Area
• Attend network sites outside regular business hours when an issue cannot be resolved remotely
• Provide on-site senior technical support for serious or complex customer-location issues when Field Services needs assistance; routine customer installations are not normally part of the role
• Monitor infrastructure alerts and respond to urgent service-affecting issues outside regular business hours when required
• Review and audit network operations and technical support tickets to ensure appropriate, timely handling
• Plan and manage technical projects, priorities, maintenance activities, and outstanding work
• Guide, mentor, and train Technical Support and Field Services teams, including on new equipment, systems, and procedures
• Assist Field Services with complex installations, troubleshooting, and deployment issues
• Inspect network installations and configurations for compliance with company standards
• Oversee networking equipment inventory and help maintain appropriate spare equipment
• Keep management informed about incidents, risks, priorities, project progress, and unresolved issues
• Remain available by phone, email, and messaging platforms when operational support or escalation is reasonably required

Technologies:

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

More:

We are Coextro, a growing Canadian Internet Service Provider, and we are hiring a Senior Network & Systems Engineer to take technical ownership of our infrastructure. As a small, fast-moving ISP, we offer broad responsibility, significant autonomy, and the opportunity to make a visible impact across network operations, systems, and infrastructure improvements. This is a hands-on engineering role and suits someone who enjoys investigating unfamiliar systems, solving difficult problems, and helping shape how a growing ISP operates. The position is based in person at our Mississauga office, with travel to network and customer sites across the Greater Toronto Area as required. The annual pay range is $80,000–$100,000. Benefits include casual dress, company events, dental and extended health care, vision care, on-site parking, and paid time off. We also offer opportunities for professional growth and increasing responsibility.

last updated 42 week of 2026