Senior Network Engineer

Job summary

Execute a large-scale Cisco infrastructure refresh including the build, testing, and implementation of switches and routers. Manage end-to-end network changes, including documentation, CAB presentations, and post-cutover validation.

Job details

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. 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 new 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 opportunity 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

What you’ll do

Execute a large-scale Cisco infrastructure refresh including the build, testing, and implementation of switches and routers. Manage end-to-end network changes, including documentation, CAB presentations, and post-cutover validation.

Requirements

Requires over 8 years of enterprise network engineering experience with deep expertise in Cisco Catalyst and Nexus platforms. Must have a proven track record in regulated environments like banking and hold a CCNP or CCIE certification.

Listed skills

• Network Troubleshooting · Preferred
• VLANs · Preferred
• Python · Preferred
• OSPF · Preferred

Other relevant skills

Identified from the job description. Confirm important requirements above.

• Cisco Routing and Switching
• Cisco Nexus
• BGP
• OSPF
• EIGRP
• Cisco ACI
• SD-WAN
• Cisco ISE
• Palo Alto Firewalls
• Python
• Ansible
• ITIL Change Management
• Network Troubleshooting
• L2/L3 Networking
• VLANs
• VRFs

Job areas

• Technology
• Engineering
• Consulting