Senior Network Engineer (Fortinet) — On‑Site Lead

Wanstor Limited; Greater London; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

Generous time off

Learning opportunities

Personal development

Volunteer days

Team social events

Job summary

Wanstor Limited is seeking a Senior Network Engineer to lead a Fortinet-led network for a key client, split between on-site at The Shard and remote collaboration. You will own design, configuration and implementation of network changes, with hands-on FortiGate expertise.

You’ll work directly with client stakeholders, owning issues end-to-end, documenting changes and driving improvements across LAN/WAN, SD-WAN and security architectures.

Qualifications

• Strong hands-on experience with Fortinet technologies, particularly FortiGate firewalls
• Good knowledge of Fortinet security, VPN and SD-WAN capabilities
• Strong understanding of core networking including TCP/IP, DNS, DHCP, VLANs, VPNs, NAT and network security
• Strong routing and switching knowledge
• Experience supporting and troubleshooting LAN, WAN and wireless networks
• Confidence diagnosing complex network and connectivity issues from end to end
• Experience delivering network changes, upgrades, migrations or implementation projects
• Comfortable working directly with customers and senior stakeholders
• Able to take a requirement or problem, work out the best approach and own it through to completion
• Strong documentation skills and an organised approach to change
• Experience within an MSP or customer-facing IT environment would be highly beneficial

Responsibilities

• Own, support and continually improve a Fortinet-led network environment
• Take the technical lead on network projects, from initial requirements and design through to implementation and handover
• Configure, manage and troubleshoot FortiGate firewalls, including policies, VPNs, routing, security profiles and connectivity
• Work across LAN, WAN, Wi-Fi, SD-WAN, switching, routing and firewalling
• Lead complex troubleshooting and resolve network issues that require deeper technical investigation
• Identify weaknesses, risks and opportunities for improvement across the network estate
• Work directly with customer stakeholders, translating technical issues and recommendations into clear, practical advice
• Own technical changes and ensure they're properly planned, tested, documented and communicated
• Produce and maintain network documentation, diagrams, configurations and technical standards
• Support network upgrades, migrations, refreshes and wider infrastructure projects
• Work alongside Wanstor's wider technical teams and third parties where projects cross networking, cloud, security or infrastructure

Skills

Fortinet FortiGate

Fortinet Security & SD-WAN

TCP/IP & DNS/DHCP

LAN/WAN/Wireless

Networking troubleshooting

Stakeholder communication

Job description

Wanstor Limited is seeking a Senior Network Engineer to lead a Fortinet-led network for a key client, split between on-site at The Shard and remote collaboration. You will own design, configuration and implementation of network changes, with hands-on FortiGate expertise.

You’ll work directly with client stakeholders, owning issues end-to-end, documenting changes and driving improvements across LAN/WAN, SD-WAN and security architectures.