Senior Network Engineer (Routing & Switching Specialist) – freelance – hybrid, London, UK

Senior Network Engineer (Routing & Switching Specialist) – freelance – hybrid, London, UK

London, United Kingdom | Posted on 09/03/2026

We are committed to building an inclusive workplace and encourage applications from women and other under-represented groups in tech. All qualified candidates are welcome.Start date: Apr/ May 2026 Location: London, UK (Hybrid — minimum 2 days per week in office)

Job Description

Working closely with the Senior Network Architect, this hands-on engineering role is focused on the practical remediation and documentation of a complex, legacy Cisco environment. The successful candidate will be a routing expert capable of diagnosing and unpicking unconventional protocol configurations, building standards-compliant designs, and supporting the convergence of two network environments.

Responsibilities

• Audit and document the existing network estate (~1,000 devices across both banking entities).
• Identify and remediate non-standard routing configurations, including atypical EIGRP deployments.
• Define and implement standardised change categories, change risk classifications, and change management templates.
• Support the transition from hybrid ACI to target-state architecture.
• Develop network documentation and operational runbooks.
• Provide detailed input into the network baseline assessment.
• Act as a subject matter expert during change approval board (CAB) reviews.
• Work with managed service providers to ensure designs and standards are followed during implementation.

Requirements

Must have

• Expert-level Cisco Routing & Switching: IOS, IOS-XE, NX-OS
• Hands-on experience with Cisco Nexus platforms (2K, 5K, 7K, 9K)
• Deep routing protocol knowledge: EIGRP, OSPF, BGP — including troubleshooting of complex or misconfigured environments
• Familiarity with Cisco ACI and spine-leaf fabric architectures
• Proficiency with network documentation tools and diagramming
• Experience working in dual-stack (legacy + modern) environments
• Understanding of network security segmentation and firewall integration

Advantages

• CCIE or CCNP (Routing & Switching or Data Centre)
• Automation/scripting experience (Python, Ansible, or similar)
• Experience in financial services or similarly regulated environments
• Detail-oriented with a methodical approach to problem diagnosis
• Able to produce clear, well-structured technical documentation
• Comfortable working in a fast-paced environment with competing priorities
• Constructive and collaborative when working with legacy team members and external managed service providers

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