Network Engineer

Job Description

Network Engineer

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London | Contract (Inside IR35)

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We are seeking an experienced Network Engineer to support a major office relocation, data centre migration, and network transformation programme. This includes the deployment of a new FX trading platform, migration of critical network infrastructure, and the relocation of services across multiple sites and data centres.

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The successful candidate will play a key role in the migration and implementation of Arista, Aruba, and Cisco networking technologies, alongside Layer 2 and Layer 3 telecoms migrations. You will work closely with third-party telecom providers to migrate existing circuits and services while ensuring minimal disruption to business-critical operations.

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This is a hands-on engineering role requiring strong technical expertise across both physical infrastructure and logical network migrations. The position will involve working within fast-paced, highly available environments and will require occasional out-of-hours support for cutovers, implementation windows, and post-migration validation.

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Key Responsibilities

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• Support the planning, implementation, and execution of office relocation and data centre migration activities.

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• Deploy and migrate network infrastructure using Arista, Aruba, and Cisco technologies.

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• Perform Layer 2 and Layer 3 network migrations, ensuring service continuity and network stability.

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• Coordinate with telecom providers to migrate WAN circuits, carrier services, and existing connectivity.

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• Execute network cutovers, testing, validation, and troubleshooting activities.

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• Install, patch, and manage physical network infrastructure, including copper and fibre cabling.

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• Produce and maintain technical documentation, migration runbooks, and implementation plans.

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• Work closely with infrastructure, telecoms, and business stakeholders across multiple locations.

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• Provide out-of-hours support during critical migration and implementation phases.

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Required Experience

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• Proven track record delivering:

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• Office relocation projects

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• Data centre migration programmes

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• Network implementations supporting trading platforms or other business-critical systems

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Strong hands-on experience with:

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• Arista networking technologies

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• Aruba networking technologies

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• Cisco networking technologies

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Excellent understanding of Layer 2 and Layer 3 networking, including:

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• Switching

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• Routing

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• VLANs

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• Trunking

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• Spanning Tree Protocol (STP)

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• Link Aggregation Control Protocol(LACP)

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• IP addressing

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• Interface configuration

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• Connectivity testing and troubleshooting

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• Multicast networking

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• Experience delivering telecom and WAN migrations, including carrier transitions and service handovers.

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• Experience working directly with telecom providers and network carriers to migrate and validate services.

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Strong practical cabling experience, including:

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• Copper and fibre patching

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• Rack installations

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• Cable routing and management

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• Labelling standards

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• Physical infrastructure best practice

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Experience

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• Financial services, capital markets, or trading environment experience.

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• Experience supporting low-latency or business-critical platforms.

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• Knowledge of multicast networking within trading environments.

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• Experience with Infinera or optical transport platforms.

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Familiarity with:

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• Out-of-band management solutions

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• Console access technologies

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• Structured migration methodologies

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• Detailed migration runbooks and change procedures

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• Relevant certifications such as

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• CCNA

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• CCNP

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• Arista ACE

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• Equivalent industry certifications

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