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Coextro

Senior Network & Systems Specialist

Mississauga, ON, Canada

Full-time

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Job details

Job type: Full-time
Apply by: Apr 13, 2027
Posting language: English
Posted: Oct 15, 2026

Original job description

Job description:

Coextro is a growing Canadian Internet Service Provider seeking an experienced, hands-on Senior Network & Systems Engineer to take technical ownership of our network infrastructure and related systems.

This is not a narrowly defined corporate networking position supported by several specialized departments. We are a small, fast-moving ISP, and the successful candidate will be expected to personally investigate problems, configure equipment, build and improve systems, lead technical projects, and create the documentation and operational processes needed to support our continued growth.

We are looking for someone with strong practical networking and systems experience who can begin contributing with limited technical supervision. You must be comfortable working in an environment where not every system is fully documented, not every process has been formalized, and determining how something currently works may be the first step toward improving it.

This position provides significant autonomy and the opportunity to make a visible impact. You will become our senior internal technical resource for network operations, system builds, infrastructure improvements, and complex escalations. You will also provide technical guidance to our Technical Support and Field Services teams, but this remains a highly hands-on engineering position - not solely a management or delegation role.

Key Responsibilities

Operate, maintain, troubleshoot, and improve our core and distribution networks and related systems.
Take ownership of complex technical issues and carry them through investigation, 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 weaknesses and opportunities to improve network stability, performance, visibility, security, and operating costs.
Independently assess existing systems, including inherited or incompletely documented configurations.
Develop and maintain network diagrams, configuration records, operating procedures, technical standards, and troubleshooting documentation.
Create practical and repeatable processes for network operations, deployments, maintenance, and incident response.
Serve as the senior escalation point for network outages, service issues, installations, technical support issues, and deployment challenges.
Serve as the primary on-call technical resource for network outages and other service-affecting infrastructure issues.
Respond to network outages at our downtown Toronto data centre and at distribution network locations within the condominium buildings we service throughout the Greater Toronto Area.
Attend network sites outside regular business hours when an issue cannot be resolved remotely.
Provide on-site escalation support for serious or complex customer-location issues when Field Services personnel require senior technical assistance.
This position does not normally perform routine customer installations but may assist with difficult installation or service issues when required.
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 issues are handled appropriately and within acceptable timelines.
Plan and manage technical projects, priorities, maintenance activities, and outstanding work.
Provide technical guidance, mentorship, and training to Technical Support and Field Services personnel.
Assist Field Services personnel with complex installations, troubleshooting, and deployment issues.
Inspect network installations and configurations to ensure they meet company standards.
Train technicians and support staff on new equipment, systems, and procedures.
Oversee networking equipment inventory and help ensure appropriate spare equipment is available.
Communicate clearly with management regarding incidents, risks, priorities, project progress, and unresolved issues.
Remain available by phone, email, and messaging platforms when operational support or escalation is reasonably required.

What Success Looks Like

You take ownership of technical problems without needing every step assigned or explained.
You are comfortable working independently as the senior hands-on technical resource.
You can understand unfamiliar systems and configurations through investigation and practical troubleshooting.
You identify and address problems before they become major service-affecting incidents.
You personally complete configurations, upgrades, troubleshooting, and system builds when required.
You create useful documentation and repeatable processes instead of relying solely on informal knowledge.
You balance immediate operational needs with longer-term network and system improvements.
You communicate clearly, follow through on commitments, and keep management informed.
You leave the network and its supporting systems more stable, organized, visible, and maintainable than you found them.

Required Qualifications

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 general service-provider infrastructure.
Experience configuring and troubleshooting Cisco routers and switches.
Experience with Cisco ASR 1000 Series routers 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 using network monitoring and alerting platforms such as Zabbix, PRTG, or similar systems.
Demonstrated 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, and prioritization skills.
Ability to manage multiple operational issues and projects without losing track of follow-up work.
Excellent written and verbal communication skills.
Ability and willingness to respond to urgent after-hours issues when required.
Valid Ontario Class G driver’s licence and the ability to attend network and customer locations throughout the Greater Toronto Area as required.
Ability to work full-time from our Mississauga office. This is not a remote position.

Preferred Technical Experience

Experience with several of the following would be considered an asset. We do not expect every qualified applicant to have worked with every platform listed:

Cisco Catalyst, Small Business, and Nexus switches
Cisco ASR 1000 and ASR 9000 Series routers
PPPoE, L2TP, subscriber management, and ISP access networks
FreeRADIUS and subscriber authentication systems
ISC DHCP Server
Linux, Windows Server, and FreeBSD
Zabbix and PRTG
Sandvine ActiveLogic
Juniper NetScreen firewalls
3CX, Asterisk, and FreePBX
Ubiquiti EdgeRouters, switches, and Wi-Fi systems
VoIP and SIP infrastructure
Fibre, Ethernet, and fixed-access network deployments

The Person We Are Looking For

You may be a strong fit if you are naturally curious, technically resourceful, and motivated by having real ownership over an environment. You should enjoy finding the cause of difficult problems, improving systems that are not yet perfect, and building the processes and documentation that make future operations easier.

This role is best suited to someone who wants broad technical responsibility and the ability to influence how a growing ISP operates. It is not intended for someone looking for a narrowly defined position where responsibilities are limited to following established procedures or escalating problems to another engineering department.

Why Join Coextro?

Take a senior technical role in a growing Canadian Internet Service Provider.
Have a direct and visible impact on network reliability, operations, and future growth.
Work across a broad range of networking, systems, access, monitoring, and telecommunications technologies.
Help establish the technical standards, documentation, and processes that will support the company’s next stage of development.
Work in an environment where good ideas can be proposed, implemented, and evaluated without excessive layers of approval.
Opportunities for professional growth and increasing responsibility.

Licence/Certification:

Ontario driver's license (required)

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More about this job

Responsibilities

Operate, troubleshoot, configure, and improve the ISP’s network infrastructure and supporting systems, while leading builds, upgrades, migrations, and other technical projects. Act as the senior escalation and on-call resource, develop documentation and operational processes, and provide technical guidance to support and field teams.

Requirements

Requires significant hands-on experience with ISP, telecommunications, carrier, or service-provider networks, including production BGP, Cisco routing and switching, Linux administration, and RADIUS/AAA platforms. Candidates must be able to work independently, document and improve operations, respond to urgent after-hours issues, hold a valid Ontario Class G driver’s licence, and work full-time from the Mississauga office.

Skills

ISP Network Operations
Routing and Switching
BGP
Cisco Routers and Switches
Linux Administration
FreeRADIUS and AAA
Network Monitoring
Network Troubleshooting
Firewalls
DHCP and DNS
Network Documentation
Infrastructure Projects
Incident Response
Technical Mentorship
Systems Administration
Project Prioritization

Visa sponsorship

Not detected in the job text

Keywords

ISP
Service-Provider Networks
Routing
Switching
BGP
IP Addressing
VLANs
Cisco ASR 1000
Cisco Catalyst
Cisco Nexus
Linux
FreeRADIUS
RADIUS
AAA
DHCP
DNS
Zabbix
PRTG
Firewalls
PPPoE
L2TP
Subscriber Management
ISC DHCP Server
FreeBSD
VoIP
SIP
Fibre
Ethernet
Network Monitoring
Incident Response

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