Senior Network Engineer – Trading Infrastructure

Senior Network Engineer – Trading Infrastructure

This role supports a network refresh program replacing approximately 60 end-of-life switches (Arista 7150 and Cisco) across exchange co-location environments supporting mission-critical trading infrastructure. Work is executed within strictly limited weekend change windows with zero-downtime requirements. The engineer will work alongside the EMEA Regional Manager (London-based), operating at pace, adapting quickly to unexpected changes, and executing with precision and independence.

Key Responsibilities

Execute replacement and migration of ~60 end-of-life Arista 7150 and Cisco switches across exchange co-location environments

Apply and validate customized switch configurations accurately within limited change windows

Manage and maintain external connectivity to exchanges and extranet environments

Configure and troubleshoot BGP and multicast routing in live trading environments

Ensure zero-downtime delivery across all migration and change activity

Resolve complex network issues independently with minimal escalation

Liaise directly with exchanges, external parties, and internal engineering teams at a technical level

Mandatory Requirements

Availability to work every weekend for change window execution

Financial services/trading industry experience — exchange or co-location environments strongly preferred

Hands-on Arista experience, including the 7150 series

Firewall experience in complex network environments

Extranet connectivity experience

Strong BGP and multicast knowledge in production environments

Proven ability to troubleshoot complex issues under pressure

Zero-downtime migration experience

Strong technical communication skills, internal and external

Desirable Skills

Packet capture and analysis

Syslog analysis

Corvil latency analysis tools