I'll be sharing my journey with Nix, especially Nix writers, and how they've played a crucial role in revamping an old system into a more effective and productive setup. Throughout the talk, I'll walk you through the step-by-step process and shed light on how I handle unexpected challenges – the kinds of things Nix aims to avoid. I'll also delve into the practical use of 'writerShellScript' to manage significant side effects at the top level.