Senior Network Engineer - Trading Infrastructure

Senior Network Engineer – Trading InfrastructureThis 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 ResponsibilitiesExecute replacement and migration of ~60 end-of-life Arista 7150 and Cisco switches across exchange co-location environmentsApply and validate customized switch configurations accurately within limited change windowsManage and maintain external connectivity to exchanges and extranet environmentsConfigure and troubleshoot BGP and multicast routing in live trading environmentsEnsure zero-downtime delivery across all migration and change activityResolve complex network issues independently with minimal escalationLiaise directly with exchanges, external parties, and internal engineering teams at a technical levelMandatory RequirementsAvailability to work every weekend for change window executionFinancial services/trading industry experience — exchange or co-location environments strongly preferredHands-on Arista experience, including the 7150 seriesFirewall experience in complex network environmentsExtranet connectivity experienceStrong BGP and multicast knowledge in production environmentsProven ability to troubleshoot complex issues under pressureZero-downtime migration experienceStrong technical communication skills, internal and externalDesirable SkillsPacket capture and analysisSyslog analysisCorvil latency analysis tools