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