At Trainline we have 30+ android engineers working across 580+ modules. Our app is over 10 years old. Keeping things modern and consistent is tricky. In this talk I will discuss strategies we use at Trainline to measure and enforce consistency using a combination of off the shelf products such as App Vitals, Copilot PR reviews and Detekt custom rules, as well as vibe coding our own custom tooling. And learn how you can do it too