Senior Network Engineer - Fortinet

Wanstor; Greater London; Hybrid; GBP 55,000 - 75,000; Full time

Benefits offered by this job

24 days annual leave

Lunch & learn sessions

Paid volunteer days

Professional development

Job summary

Wanstor is seeking an experienced Network Engineer to own and continually improve a Fortinet-led network environment. You will lead network projects from requirements through to implementation and handover, configuring FortiGate firewalls, VPNs and SD-WAN, and delivering clear, practical guidance to customer stakeholders.

You will work across LAN, WAN, Wi‑Fi, SD‑WAN, routing and switching, with a focus on issue resolution, documentation, and collaboration with wider technical teams.

Qualifications

• Strong hands-on experience with Fortinet technologies.
• 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.

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

VPN & SD-WAN

TCP/IP networking

LAN/WAN

Wi‑Fi

Network security

Tools

FortiGate firewall

Wireshark

Job description

Description

Wanstor is an award-winning Managed IT Services provider helping ambitious organisations use technology to achieve better business outcomes — securely, efficiently, and at scale. Established in 2002, we deliver end-to-end technology services spanning managed IT support, cloud, infrastructure, networking, security, communications, and AI adoption services.

Department

Department: Network Engineering

Location

Location: Hybrid

What You'll Do

• 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

What You'll Need

• 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

What You'll Love

• Generous Time Off: Enjoy 24 days of annual leave, increasing by 1 day each year up to 28 days, plus Bank Holidays.
• Continuous Learning: Participate in regular lunch and learn sessions with both internal and external speakers.
• Personal Development: Take advantage of 5 paid days annually to pursue new skills or knowledge.
• Volunteer Opportunities: Contribute to your community with 2 paid volunteer days each year.
• Team Spirit: Join a friendly team and engage in various social events organised throughout the year.