There are unique engineering challenges associated with building iOS & Android apps as compared to building a web frontend or backend. Your app code runs on your user’s device, which introduces subtle issues that can be missed during software development. When you scale your apps up to thousands or millions of users, such oversights start becoming more problematic and difficult to fix in hindsight. This talk walks through some common architectural challenges that are encountered over a mobile app’s lifetime and ways to identify and mitigate these risks early-on. By building a resilient mobile app from the start, you can avoid costly mistakes later. All these lessons are from real-life experiences while developing and supporting mobile apps with millions of users in Germany such as Lufthansa and McDonald’s.