Senior Network Engineer

Opticore ITare currently searching for aSenior Network Engineerwho is operating at aCCNPlevel with strong general routing and switching knowledge to come and join the team. You\’ll join our excelling team, based in theLondonarea.Opticore ITis a specialistNetwork Engineer and Project Managementconsultancy offering a wide variety of opportunities to work within fast-paced, challenging environments across our client base spanning multiple sectors including Finance, Broadcast Media, Telecommunications and more.This opportunity focuses on the IP/MPLS infrastructure that underpins the mobile packet core network, including interconnects with partner networks, enterprise APN connectivity, and internet breakout infrastructure.The environment consists of a Cisco and Nokia-based packet core network, operating at large scale and supporting high-throughput subscriber traffic.What you\’ll be doingOperate and maintain large-scale IP/MPLS networks, ensuring stability, performance, and rapid resolution of routing-related incidents.Configure and manage BGP and IS-IS routing, including policy design, traffic engineering, and VRF-based segmentation.Manage external interconnects and peering relationships, ensuring reliable connectivity with roaming partners, internet providers, and enterprise networks.Support integration of mobile packet core infrastructure, ensuring efficient traffic flow between gateways, internet breakouts, and enterprise connectivity.Monitor and optimise subscriber traffic, including CGNAT environments, to maintain performance, scalability, and compliance with logging requirements.What you\’ll bringStrong experience operating large-scale service provider IP/MPLS networks with advanced BGP (eBGP/iBGP) and IS-IS, including VRF segmentation, traffic engineering, and routing policy design.Proven experience designing and operating NNI interconnects, managing external peering relationships, and applying routing policy, filtering, and traffic engineering across interconnect environments.Solid understanding of mobile packet core integration within IP/MPLS networks, including high-throughput gateway routing, breakout design, and end-to-end traffic flow.Knowledge of mobile data networking concepts including APNs, Gi interface connectivity, and how subscriber traffic exits the packet core to external networks.Hands-on experience with CGNAT, including scaling considerations, subscriber traffic management, and regulatory logging requirements.Diversity AtOpticore ITwe embrace diversity and are committed to equal opportunities. We actively recruit for an inclusive and diverse workforce and as such, want to ensure we do everything we can to support your application. We want you to feel empowered to let us know if you require any adjustments to be made with your application or interview process so please speak to our recruitment team.#J-18808-Ljbffr