<p>There are traps in the world of software development that can catch even experienced developers off guard. The talk will reveal the non-obvious aspects of using generated contracts between the server and the client, in particular, in the context of TypeScript and GraphQL. Join us to hear a story where developers face real challenges and temptations in the world of code. We'll see what consequences blind compliance with the conditions can lead to. And also we will try to find out "where is the Devil hiding in?".</p>