This document summarizes a presentation about using GraphQL at LeanIX. It introduces the two presenters, Patrick Surrey and Dr. Niklas Henrich, both frontend developers at LeanIX. It then demonstrates LeanIX's tool for documenting complex IT landscapes using GraphQL and discusses how LeanIX has implemented GraphQL in their applications and services architecture. Key points covered include benefits of GraphQL over REST APIs, how queries are built in Angular, and lessons learned in implementing GraphQL.