Senior Network Engineer

Sanderson; Greater London; On-site; GBP 70,000 - 90,000; Full time

Job summary

A leading technology firm in Greater London is seeking a Senior Network Engineer to design, secure, and operate a large-scale hybrid network. You will manage Azure networking, enterprise LAN/WAN systems, and ensure performance and security across corporate and retail environments. Ideal candidates will have hands-on experience with firewalls, SD-WAN, and complex network troubleshooting. This role offers competitive compensation and opportunities for career growth.

Qualifications

• Hands-on experience in hybrid network design and operations.
• Expertise in monitoring and troubleshooting complex network issues.
• Proven experience with retail networking and POS support.

Responsibilities

• Design and operate Azure networking components.
• Manage enterprise LAN/WAN infrastructure.
• Deploy and support firewalls for secure network segmentation.

Skills

Azure networking (VNets, routing)

Enterprise LAN/WAN management

Firewall deployment (SonicWall, Palo Alto)

Retail store networking

Network troubleshooting

Automation (Terraform, PowerShell, Python)

Deep knowledge of TCP/IP, BGP, OSPF

SD-WAN exposure

Tools

Cisco

Meraki

Aruba

Juniper

Azure Firewall

Job description

We’re looking for a Senior Network Engineer to design, secure, and operate a large-scale hybrid network across Microsoft Azure, corporate offices, datacentres, and a nationwide retail estate.

This is a hands‑on role with architectural input, covering Azure networking, enterprise LAN/WAN, firewalls, SD‑WAN, hybrid connectivity, and retail store networking. You’ll be responsible for availability, performance, resilience, and security across both corporate and customer‑facing environments.

• London Based

What You’ll Do

• Design and operate Azure networking (VNets, routing, Azure Firewall, VPN Gateway, ExpressRoute, load balancing)
• Manage enterprise LAN/WAN using Cisco, Meraki, Aruba, Juniper, or equivalent
• Deploy and support firewalls (SonicWall, Palo Alto, Fortinet) and secure network segmentation
• Design and support retail store networks (Meraki, SD‑WAN/MPLS, POS connectivity, Wi‑Fi, 4G/5G failover)
• Operate hybrid connectivity between Azure and on‑prem environments
• Monitor and troubleshoot complex network issues across cloud, datacentre, and retail
• Automate network builds using Terraform, PowerShell, Python, or Azure CLI
• Work with vendors, carriers, and service providers to maintain SLA performance
• Enterprise routing, switching, and firewall expertise
• Proven retail networking and POS support experience
• Deep knowledge of TCP/IP, BGP, OSPF, VPNs, DNS/DHCP, IPv4/IPv6
• Experience with SD‑WAN and hybrid cloud connectivity
• Excellent troubleshooting and documentation skills
• Azure Virtual WAN or cloud firewalls
• AWS networking exposure