This piece was written for enterprise technology leaders and originally published on the Wednesday Solutions mobile development blog . Wednesday is a mobile development staffing agency that helps US mid-market enterprises ship reliable iOS, Android, and cross-platform apps — with AI-augmented workflows built in. The 18-25 day transition timeline, what to do before the current vendor knows, and the five things that break during transitions and how to prevent them. 18 days. That is Wednesday's median transition time from signed agreement to a new team shipping independently on an enterprise mobile app, across transitions where the previous vendor was mid-project. The transition is not as complicated as it feels from the inside. The app does not go dark. Users do not notice. In-flight work does not disappear. But there are five specific things that break during transitions if not managed in advance - and three things to do before the current vendor knows you are leaving.…