Explore the design of a reactive system for automatically re-running GraphQL queries when underlying data changes in this conference talk by Martijn Walraven from Meteor. Learn how to implement real-time updates for collaborative app features with minimal additional code, integrate with SQL databases or REST APIs, and leverage GraphQL's best features to simplify data management while maintaining predictability and maintainability. Discover techniques for building reactive GraphQL applications using Apollo, and gain insights into creating more efficient and responsive web applications.