Network Engineer

Network Engineer

London | Contract (Inside IR35)

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.

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.

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.

Key Responsibilities

• Support the planning, implementation, and execution of office relocation and data centre migration activities.
• Deploy and migrate network infrastructure using Arista, Aruba, and Cisco technologies.
• Perform Layer 2 and Layer 3 network migrations, ensuring service continuity and network stability.
• Coordinate with telecom providers to migrate WAN circuits, carrier services, and existing connectivity.
• Execute network cutovers, testing, validation, and troubleshooting activities.
• Install, patch, and manage physical network infrastructure, including copper and fibre cabling.
• Produce and maintain technical documentation, migration runbooks, and implementation plans.
• Work closely with infrastructure, telecoms, and business stakeholders across multiple locations.
• Provide out-of-hours support during critical migration and implementation phases.

Required Experience

• Proven track record delivering:
• Office relocation projects
• Data centre migration programmes
• Network implementations supporting trading platforms or other business-critical systems

Strong hands-on experience with:

• Arista networking technologies
• Aruba networking technologies
• Cisco networking technologies

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

• Switching
• Routing
• VLANs
• Trunking
• Spanning Tree Protocol (STP)
• Link Aggregation Control Protocol(LACP)
• IP addressing
• Interface configuration
• Connectivity testing and troubleshooting
• Multicast networking
• Experience delivering telecom and WAN migrations, including carrier transitions and service handovers.
• Experience working directly with telecom providers and network carriers to migrate and validate services.

Strong practical cabling experience, including:

• Copper and fibre patching
• Rack installations
• Cable routing and management
• Labelling standards
• Physical infrastructure best practice

Preferred Experience

• Financial services, capital markets, or trading environment experience.
• Experience supporting low-latency or business-critical platforms.
• Knowledge of multicast networking within trading environments.
• Experience with Infinera or optical transport platforms.

Familiarity with:

• Out-of-band management solutions
• Console access technologies
• Structured migration methodologies
• Detailed migration runbooks and change procedures
• Relevant certifications such as
• CCNA
• CCNP
• Arista ACE
• Equivalent industry certifications