Senior Core Network Engineer

Senior Core Network Engineer | 6 months initially | 2 days on site | London, Chester or Bromley | £465 p/d | Inside IR35 We're seeking an experienced Senior Core Network Engineer to support the evolution of a large-scale enterprise network. This role would suit an engineer with extensive experience in Cisco core networking technologies, network automation, and delivering large-scale infrastructure projects within enterprise or service provider environments. What You'll Be Doing

• Design, implement and optimise large-scale core network infrastructure.
• Lead network transformation programmes, hardware refreshes and platform upgrades.
• Deliver end-to-end migration activities, including planning, implementation and rollback strategies.
• Build and enhance network automation capabilities using Cisco NSO and modern automation technologies.
• Support routing, switching and optical networking across a global environment.
• Produce technical documentation, engineering standards and implementation plans.
• Work closely with architecture, operations and project teams to deliver strategic infrastructure initiatives.
• Troubleshoot complex networking issues and drive continuous service improvements. What We're Looking For
• Extensive experience engineering enterprise or service provider core networks.
• Strong expertise with Cisco IOS-XR.
• Hands-on experience with Cisco NSO and network automation.
• Excellent knowledge of MPLS, Segment Routing (SR-MPLS), BGP, OSPF and ISIS.
• Experience with Cisco 8000, ASR9000 or NCS platforms.
• Strong understanding of WAN and optical networking technologies.
• Experience with Python, YANG, NETCONF or REST APIs for network automation.
• Proven experience delivering large-scale network migrations, software upgrades and infrastructure transformation programmes. Desirable Experience
• CCNP or CCIE certification.
• Infrastructure as Code using Terraform or Ansible.
• Experience within highly regulated or financial services environments.
• Knowledge of cloud networking, DevOps methodologies or Arista technologies. If this sounds like a fit, APPLY NOW! Senior Core Network Engineer | 6 months initially | 2 days on site | London, Chester or Bromley | £465 p/d | Inside IR35