CNI Network Engineer

About us

At National Grid, we keep people connected and society moving. But it's so much more than that. National Grid provides the environment that allows us to make it happen. As we generate momentum in the energy transition for all, we don't plan on leaving any of our customers in the dark. So, join us as a CNI Network Engineer, and find your superpower.

National Grid is hiring a CNI Network Engineer for our CNI Operations team. This role is based at our Warwick office, with hybrid working (1 day per week on site). You'll play a key role in designing, developing and supporting secure, scalable network platforms that underpin critical operations across our enterprise.

Step into a role where your work truly keeps the country connected. As a CNI Network Engineer within National Grid's CNI Operations Team, you'll be at the heart of designing, implementing and optimising the critical networks that power our most essential services.

You'll take ownership of a diverse and high impact technical landscape - from LAN and WAN to WLAN and data centre networks - ensuring our platforms deliver the reliable, secure and low latency connectivity that our organisation depends on every single day.

If you love getting hands on with cutting edge network technology, thrive on solving complex technical challenges, and want to play a key role in shaping and improving our network services, this is the place for you. You'll contribute to major network projects, drive continuous improvements, and help strengthen the resilience of systems that keep society moving.

Join us and make a real difference on a national scale.

As a CNI Network Engineer, you'll play a key role in shaping, securing and optimising the networks that keep our critical operations running. Your work will have real impact every day. You will:

• Design, build and support high performance LAN, WAN, WLAN and data centre networks that deliver fast, secure and reliable connectivity.
• Work hands on with core networking technologies
  , including routing, switching, TCP/IP, DNS, DHCP, VLANs and advanced protocols such as BGP and OSPF.
• Optimise and strengthen our infrastructure by performing upgrades, installing patches and enhancing stability, resilience and performance.
• Configure and maintain network hardware and security tools
  , including routers, switches, firewalls, VPNs and load balancers.
• Troubleshoot and resolve complex network issues
  , restoring services quickly and preventing future incidents.
• Collaborate with security teams and architects to enforce strong access controls, segmentation and compliance standards.
• Monitor network performance
  , proactively identifying improvements and keeping our environments running smoothly.
• Contribute to major projects and network enhancements
  , bringing fresh ideas, new technologies and continuous improvement to the team.

You're a network engineer who thrives in complex, high impact environments. You enjoy solving challenging technical problems, improving network performance, and contributing to the resilience of critical national infrastructure. You bring strong hands on experience, a proactive mindset and the confidence to collaborate across teams.

Here’s what you’ll bring:

• Hands on expertise with VMware NSX and VMware VCF - you understand software defined networking, micro segmentation, virtual network design and private cloud networking, and can apply NSX in real world, high security environments.
• Strong networking fundamentals - fluent in TCP/IP, DNS, DHCP, VLANs, routing, switching and IP addressing, with experience across Cisco networking technologies to deliver secure and scalable solutions.
• Advanced routing & switching expertise - including BGP, OSPF and EIGRP, with the ability to support multi site, high availability environments.
• Security focused mindset - familiar with firewalls, VPNs, wireless/WLAN, MPLS/SD WAN and modern network security practices.
• Exceptional troubleshooting skills - able to diagnose and resolve complex issues methodically, even under pressure during major incidents.
• Clear, confident communication - capable of translating complex technical concepts for non technical…