Breaking the Monolith: Tesco’s Journey to Federated GraphQL with xAPI - Vishwas Chandrashekar

This talk explores Tesco's evolution of the xAPI from a monolithic GraphQL API to a Federated GraphQL architecture, addressing challenges in scalability, capacity, and team autonomy. The speaker details the practical journey of this transformation, highlighting the application of the Strangler Pattern for incremental migration and the implementation of schema governance, observability, CI/CD pipelines, and multi-layer caching. The session concludes with insights into the measurable business and technical impacts of federation at Tesco, including enhanced resilience and a unified API that merges in-store and online experiences.