Senior Back End Developer

Robert Half have partnered with a high growth sports manufacturing organisation based in London who are looking to engage an experienced Senior Backend Engineer to support the evolution of a live, transaction-driven platform as it scales internationally.This is an initial 6-month, Inside IR35 contract, focused on building and scaling core backend systems that support global commerce, real-time interactions, and the integration of newly acquired platform capabilities.Responsibilities:Owning and evolving backend services within a high-scale, real-time environmentDesigning and scaling systems to support multi-currency and cross-border transactionsBuilding and extending a shared transaction and ledger layer used across multiple platformsSupporting the integration of newly acquired products and capabilities into the core platformDesigning and exposing APIs for frontend, mobile, and third-party platform use casesHandling complex transaction logic including currency conversion, fees, reconciliation, and refundsSupporting region-specific requirements such as tax, compliance, and shipping logicImproving performance, resilience, and scalability of transaction-heavy systemsLeading architectural decisions across backend and platform servicesMentoring engineers and contributing to higher backend engineering standardsCollaborating closely with frontend, mobile, and product teams to deliver global user experiencesSkills:Extensive experience working as a Senior Backend Engineer in ..... full job details .....