Job Description
On behalf of our client, Affinity is seeking a hands‑on Senior Network Engineer to support a large-scale Cisco infrastructure refresh across a complex enterprise environment. This is a delivery‑focused role where the successful candidate will execute approved network designs through build, testing, implementation, and post‑cutover validation. Working within a highly regulated environment, the engineer will be responsible for end‑to‑end network changes, including configuration, change management, troubleshooting, documentation, and maintenance window execution.

On behalf of our client, Affinity is seeking a hands‑on Senior Network Engineer to support a large-scale Cisco infrastructure refresh across a complex enterprise environment. This is a delivery‑focused role where the successful candidate will execute approved network designs through build, testing, implementation, and post‑cutover validation. Working within a highly regulated environment, the engineer will be responsible for end‑to‑end network changes, including configuration, change management, troubleshooting, documentation, and maintenance window execution.

Responsibilities

Execute switch and router replacements across data centre, branch, and campus environments — staging, configuration, cutover, and validation

Build and standardize configurations from approved templates; identify and flag drift

Own your changes end to end: write the change record, present it at CAB, execute in the window, validate, and close

Troubleshoot L2/L3 issues under time pressure during and after cutovers, including rollback decisions

Perform pre-cutover discovery and dependency mapping on legacy gear

Update as-builts, diagrams, and IPAM records — accurately, without being chased

Coordinate directly with app teams, security, facilities, and vendors to sequence work

Work independently across multiple concurrent sites with minimal supervision

Qualifications

8+ years hands‑on enterprise network engineering,



with the majority in operations and implementation rather than design

Deep Cisco routing and switching: Catalyst (9000 series), Nexus (NX‑OS, vPC, VDC), ISR/ASR, IOS‑XE

Demonstrated delivery on at least one large‑scale hardware refresh or migration program

Strong core protocol depth: BGP, OSPF, EIGRP, spanning tree, VLANs, VRFs, HSRP/VRRP, QoS

Proven experience in banking, insurance, or capital markets — you understand regulated change control, segregated environments, and why a failed window is a serious event

Comfortable working in ITIL change management (ServiceNow or equivalent) and writing your own change records

Willing and available to work scheduled evening and weekend maintenance windows

Self‑directed: takes a work package, asks the right questions once, and delivers without daily direction

CCNP or CCIE (R&S; / Enterprise Infrastructure)

Cisco ACI, SD‑WAN (Viptela), DNA Center / Catalyst Center

Cisco ISE and 802.1X in a production financial environment

Firewall exposure (Palo Alto, Cisco ASA/FTD)

Automation for repetitive config work — Python, Ansible, or Netmiko

Affinity Earn
Know someone who’s great for this, or any of our open roles? Earn up to $4,000/year for each successful referral through Affinity Earn. You can also earn up to $50,000 for helping us find recent clients. Learn about our referral program at https://affinity-group.ca/earn/ or browse our jobs & follow us at https://www.linkedin.com/company/affinity-staffing/jobs/

About Affinity
Affinity Group is a technology and business consulting and services company. We believe in creating long term relationships between clients and consultants that foster a mutually beneficial partnership. Affinity is an equal prospect employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. All employment is decided on the basis of qualifications, merit and business need.

For more information on Affinity, please visit www.affinity-group.ca

Job Number: 13902

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📌 Senior Network Engineer (Ontario)
🏢 Affinity
📍 Ontario