TikTok reduces code size by 58% and improves app performance for new features with Jetpack Compose

TikTok's Android team migrated to Jetpack Compose to address technical debt and performance issues caused by complex, deeply nested View hierarchies. The migration delivered up to 78% reduction in page loading time for new or fully rewritten pages and a 58% reduction in code size compared to equivalent View-based implementations. The team adopted an incremental migration strategy, starting with the QR code feature, then expanding to Login and Sign-up flows. Key learnings include avoiding multiple small ComposeViews inside a single ViewHolder (use one ComposeView per ViewHolder instead) and that migrating ViewPager to Composable outperformed migrating individual Fragments. TikTok plans to make Compose their preferred Android UI framework long-term.