Senior L3 Network Engineer (Network SME and Automation Lead)

Toronto, ON
On-site
Posted Oct 9, 2026
1 position

$100,000–$120,000 / year

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Employment type: Full-time
Experience level: Lead · 10+ years
Posting language: English
Working hours: 40 hours per week
Seniority: Mid-Senior level
Application method: Direct apply is available

Job summary

Lead switch lifecycle refresh engineering, including technical discovery, design, migration planning, implementation, validation, and governance. Resolve complex network issues, develop automation and operational improvements, and mentor engineers while overseeing technical readiness and change quality.

Job details

Inclusion without Exception Tata Consultancy Services (TCS) is an equal opportunity employer, and embraces diversity in race, nationality, ethnicity, gender, age, physical ability, neurodiversity, and sexual orientation, to create a workforce that reflects the societies we operate in. Our continued commitment to Culture and Diversity is reflected in our people stories across our workforce and implemented through equitable workplace policies and processes. TCS has been serving the Canadian marketplace for more than 35 years and today is the technology partner of choice for many of the country's leading organizations. As one of the largest IT services providers in Canada and globally, TCS is aiming to become the world's largest AI-led technology services company and is enabling its clients to transform themselves across the full AI stack, from infrastructure to intelligence. Rooted in the heritage and values of the Tata Group, TCS is focused on creating long-term value for its clients, investors, employees, and the communities it serves. With a highly skilled workforce supporting customers from coast to coast, TCS has consistently been recognized as a Top Employer by the Top Employers Institute, including a recent top ranking at the country level. TCS also sponsors 14 of the world's most prestigious marathons and endurance events, including the TCS Toronto Waterfront Marathon, reflecting its commitment to health, sustainability, and community empowerment. Senior L3 Network Engineer (Network SME and Automation Lead) Role Overview The Senior L3 Network Engineer is the technical lead for the Switch Lifecycle Refresh Program, with responsibility for engineering design, migration planning, technical governance, advanced troubleshooting, automation development, and escalation management. This role independently leads complex refresh activities, owns annual automation initiatives, and drives continuous improvements in operational efficiency through scripting and process innovation. Core Responsibilities Network Refresh Engineering Assess switch refresh candidates and confirm hardware lifecycle requirements. Conduct technical discovery and deployment-readiness assessments. Develop deployment strategies, methods of procedure (MOPs), and rollback plans. Validate hardware, software, and feature compatibility. Lead migration planning, implementation, and validation activities. Review and improve engineering standards, templates, and implementation practices. Advanced Troubleshooting and Escalation Diagnose and resolve complex Layer 2 and Layer 3 network issues. Perform root-cause analyses and assess service and business impacts. Provide senior-level support during critical outages and maintenance windows. Analyze packet captures, device logs, alarms, and telemetry. Investigate routing, switching, convergence, and performance anomalies. Automation and Innovation Design, develop, test, and implement network automation solutions. Automate configuration generation, validation, and deployment activities. Develop reusable pre- and post-cutover validation scripts. Implement configuration-compliance auditing and drift detection. Build dashboards for deployment tracking, lifecycle status, and operational reporting. Identify and deliver at least one measurable productivity or efficiency improvement each year. Technical Leadership and Governance Mentor L2 engineers and support their technical development. Review change requests, implementation plans, MOPs, and rollback procedures. Lead technical governance, design assurance, and readiness reviews. Contribute to architecture, standards, and solution-design discussions. Required Skills Cisco Technologies Cisco Catalyst 9200, 9300, 9400, 9500, and 9600 platforms Cisco IOS XE Cisco DNA Center Arista Technologies Arista EOS Arista campus and data centre switching solutions Routing and Switching Routing protocols: BGP, OSPF, and EIGRP High availability: HSRP and VRRP Layer 2 technologies: VLANs, STP, MST, and EtherChannel Network access and traffic management: 802.1X and QoS Network Services Core services: DHCP, DNS, and NTP Authentication and access control: TACACS+ and RADIUS Monitoring and logging: SNMP and Syslog Automation Programming and scripting: Python Automation frameworks and libraries: Ansible, Nornir, and Netmiko Version control and integration: Git and REST APIs Tools SolarWinds ServiceNow Wireshark Cisco DNA Center Salary Range - CA$ 100,000 - CA$ 120,000 Per Year Tata Consultancy Services Canada Inc. is committed to meeting the accessibility needs of all individuals in accordance with the Accessibility for Ontarians with Disabilities Act (AODA) and the Ontario Human Rights Code (OHRC). Should you require accommodation during the recruitment and selection process, please inform Human Resources. Thank you for your interest in TCS. Candidates that meet the qualifications for this position will be contacted within a 2-week period. We invite you to continue to apply for other opportunities that match your profile.

What you’ll do

Requirements

The role requires senior-level expertise with Cisco Catalyst and Arista switching platforms, IOS XE, routing and switching protocols, network services, and advanced troubleshooting. It also calls for Python-based automation using tools such as Ansible, Nornir, and Netmiko, along with technical leadership and experience guiding complex refresh activities.