Senior Network Engineer (Fortinet | ClearPass | Infoblox)

Cyber Security training courses; Oxford; Hybrid; GBP 75,000 - 102,000; Full time

Job summary

Fortinet is seeking a Senior Network Engineer to support a large-scale enterprise network across routing, switching, wireless, firewalls and core services. The role emphasizes owning technical decisions and resolving complex incidents in a hybrid Oxfordshire environment.

You will work with infrastructure and security teams, helping maintain secure, highly available services for thousands of users and critical operations. Strong senior-level expertise is essential.

Qualifications

• Senior Network Engineer with experience across enterprise-scale, multi-site networks.
• Hands-on with routing, switching, wireless, firewalls and core infrastructure.
• Strong troubleshooting and ability to lead technical decisions.

Responsibilities

• Manage enterprise firewall administration and security policy.
• Oversee wireless networking and access control platforms.
• Tune routing, switching and network performance optimization.
• Handle DNS, DHCP and IP Address Management.
• Monitor, troubleshoot and resolve network incidents.
• Deliver improvements, upgrades and project work.
• Support security and resilience initiatives.
• Collaborate with infrastructure and security teams to evolve services.

Skills

Troubleshooting

Communication

Problem solving

Leadership

Independent worker

Tools

Fortinet Firewalls

Extreme XIQ Wireless

ClearPass NAC

Infoblox IPAM

DNS/DHCP

IPv4/IPv6

LAN/WAN

Layer 2/3 Switching

Network Security & ACLs

Job description

£480 per day
6-Month Contract (Inside IR35) - Umbrella Only
Oxfordshire - Hybrid Working (2-3 Days Onsite)

Your new company

Fortinet. ClearPass. Extreme XIQ. Infoblox. Enterprise networking at scale.

We're working with a major organisation that operates a large, complex and business-critical network estate across multiple UK locations. As investment continues across infrastructure and cyber resilience, they are seeking a Senior Network Engineer to join the team and help maintain, secure and evolve their core network services.

This isn't a role for someone looking to sit behind a queue and process tickets. It's a position for an experienced engineer who enjoys diagnosing complex issues, owning technical decisions and working across a broad enterprise networking estate where reliability, security and performance genuinely matter.

You'll join an established team of infrastructure specialists, gain exposure to a wide range of technologies and play a key role in supporting an environment where networking sits at the heart of business operations.

The role offers a hybrid working model, with 2-3 days per week onsite in Oxfordshire. Given the hands‑on nature of the environment and close collaboration with infrastructure and security teams, regular site attendance forms an important part of the role.

Your new role

This is a hands-on Senior Network Engineer position supporting a sizeable multi-site network estate across routing, switching, wireless, firewalls, network access control and core infrastructure services. You'll take ownership of technical issues, support network improvement initiatives and help maintain a secure, highly available enterprise environment that supports thousands of users and critical operational services. Working alongside infrastructure and security specialists, you'll be responsible for troubleshooting complex incidents, supporting project delivery, implementing changes and contributing to the ongoing development of network services. This is an environment where you'll be trusted to operate independently, solve challenging technical problems and provide senior-level engineering expertise across a broad technology stack.

Key areas of responsibility include:

• Enterprise firewall administration and security policy management
• Wireless networking and access control platforms
• Routing, switching and network performance optimisation
• DNS, DHCP and IP Address Management
• Network monitoring, troubleshooting and incident resolution
• Service improvements, upgrades and project delivery
• Supporting network security and resilience initiatives
• Collaborating with infrastructure, security and project teams to ensure network services continue to evolve alongside business requirements

What you'll need to succeed

You'll be an experienced Senior Network Engineer with a strong background supporting enterprise-scale environments and a proven track record working across complex multi-site networks. Experience across the following technologies will be highly desirable:

• Fortinet Firewalls
• Extreme XIQ Wireless
• ClearPass or equivalent NAC solutions
• Infoblox IPAM
• LAN/WAN Networking
• Layer 2 & Layer 3 Switching
• DNS & DHCP
• IPv4 & IPv6
• Network Security & Access Control

You'll be comfortable working within complex environments, managing multiple priorities and providing technical leadership when required.

Strong troubleshooting ability, clear communication skills and a methodical approach to problem solving will be essential.

Candidates who have operated in large corporate, public sector, critical infrastructure, engineering or highly regulated environments are likely to thrive in this role.

What you get in return

You'll join a highly capable technical team working within a large-scale enterprise environment where networking remains a critical operational function.

This engagement offers a strong mix of technical challenge, project involvement and operational responsibility, making it well suited to experienced contractors who enjoy working across a broad range of technologies rather than being siloed into a single area.

You’ll gain exposure to enterprise-grade technologies, work alongside skilled infrastructure professionals and have the opportunity to make a genuine impact on the stability, security and performance of a complex network estate.