Senior Kotlin Engineer (XP, GCP) - Investment Banking - London

Senior Kotlin Engineer (XP, GCP) - Investment Banking - London/HybridDaily rate: £600 - £800 (inside IR35) Duration: 6 months Start: ASAPMy client is looking for an experienced Senior Kotlin engineer to support and extend a cloud-hosted platform used for bookbuilding issuances within Investment Banking Capital Markets. You will join a high-calibre London-based front office engineering team working on a next-generation issuance platform replacing a legacy bookbuilding system.This is a hands-on engineering role with a strong emphasis on Extreme Programming (XP) practices, including mob programming, test-driven development, and continuous refactoring. Engineers are expected to contribute across development, integration, and production support, collaborating closely to maintain high standards of code quality, system reliability, and performance.Required and Desirable SkillsStrong commercial experience building backend services using KotlinExperience with event-sourced and event-driven architecturesDeep familiarity with XP practices, including:Mob programming as a primary way of workingTest-driven development (TDD)Continuous refactoring and clean code principlesCloud experience with GCP, including:GKE and/or Cloud RunCloud SQL and Memory storeArtifact Registry and Cloud LoggingKey ManagementExperience with CI/CD and SDLC in regulated or enterprise environmentsComfortable working on production systems requiring high availability and accuracyEngineers in this role:Work primarily in ..... full job details .....