Mixing dev and production environment is one of the most common mistakes in Flutter development, and the consequences compound quickly. Test sign-ups and data pollute your production data, errors in testing sessions spike your Crashlytics error counts in production, and a single misplaced sendNotification() call during a debug run can ping thousands of real users. The fix? Flavors in Flutter allows you to create distinct versions of your application from a single codebase (e.g., Development, Production, Staging etc). By leveraging Flavors, you keep your test data separated in a Sandbox Firebase project while ensuring your production live database is clean and safe, and you can install both variants on your phone concurrently. Let's see how we can implement it in Flutter: 1. Set up 2 Firebase projects, one for development, one for production.…