Dmitry Tsepelev, a back-end developer from Evil Martians, dives into the world of GraphQL and its integration with Ruby on Rails. He discusses the advantages of GraphQL over traditional REST APIs, especially its efficiency in data handling. Dmitry explores the challenges of real-time updates and complexities in server integration. He also shares insights on GraphQL performance optimizations, including strategies for tackling the N plus one problem. Plus, get a peek into his favorite tech tools and personal preferences in development.