Lessons from Modernizing the Tech Stack of a Top App
summary
An account of modernizing the Leboncoin Android app (17M downloads, ~180k LOC) by replacing god activities and legacy processors with Android Architecture Components: ViewModel and LiveData, Retrofit and RxJava, repository adapters and feature modules. The migration included extracting about 30 feature modules, isolating legacy endpoints behind repository interfaces to let new reactive APIs coexist with old code, and resulted in roughly halved compile time, tenfold increase in tests, doubled feature delivery rate, and fewer crashes.
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