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

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

Required Experience

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

Strong hands-on experience with:

\n
• Arista networking technologies
\n
• Aruba networking technologies
\n
• Cisco networking technologies
\n

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

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

Strong practical cabling experience, including:

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

Preferred Experience

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

Familiarity with:

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