Senior Network Infrastructure Engineer Location: Remote (UK‑based) Industry: Leading Managed Services Provider Type: Fixed Term Contract (12 months) A leading Managed Services Provider is seeking a Senior Network Infrastructure Engineer to join their Core Networking team on a remote‑based 12‑month fixed term contract. This internal, non-client facing role sits at the heart of their core network operations, supporting major infrastructure projects and ensuring the stability and performance of a large‑scale, business‑critical environment. You'll be responsible for supporting, maintaining, and evolving the organisation's core network estate. The position blends significant project delivery with BAU responsibilities, offering the chance to work on complex migrations, data centre consolidation, and ongoing optimisation of a high‑availability network. Key Responsibilities Lead and deliver network infrastructure projects, including data centre consolidation and migration activities. Design, configure, and deploy switches and other core networking equipment. Support and maintain MPLS environments, with strong focus on Layer 3 VPNs. Troubleshoot and optimise BGP, VXLAN, and other advanced routing technologies. Carry out BAU tasks such as firmware upgrades, patching, and general network maintenance. Provide expert support across the core network to ensure resilience and high performance. Work with Cisco ASA and Fortinet firewalls to maintain secure network operations.About You Strong hands‑on experience with MPLS, particularly Layer 3 VPNs. Solid understanding of BGP, VXLAN, and large‑scale routing environments. Proven experience designing and deploying network infrastructure. Confident leading technical projects and delivering complex network changes. Skilled in troubleshooting and configuration across multi‑vendor environments. Experience with Cisco ASA and Fortinet firewalls. Comfortable balancing project delivery with BAU operational tasks.Remote based. Must be eligible for SC Clearance. Paying up to £52,000. Please note this is a 12 month fixed term contract