Playing in the Treehouse with Redwood and Zipline
summary
Cash App’s Redwood is a Kotlin multiplatform Compose layer that compiles one composable set into native Android, iOS and web widgets; Zipline is a Kotlin-backed JavaScript engine (QuickJS bytecode) that exposes Kotlin interfaces across the bridge using kotlinx.serialization, suspend functions and flows; Treehouse packages both so presentation logic runs in the engine and downloads updates without app‑store releases. Demo shows an emoji search UI updating in ~2–3 seconds across Android and iOS; used to push regulatory string fixes across 50 states, cutting turnaround to under an hour.
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chapters (16)
- 0:00Introduction to libraries
- 0:44Redwood multi-platform UI
- 3:47Defining the UI schema
- 6:31Generating and binding code
- 9:20How Redwood rendering works
- 13:03Implementing composables
- 15:23Redwood sample app demo
- 18:25Multi-platform support
- 21:35Zipline for dynamic updates
- 24:58Zipline API bridge
- 27:08Zipline technical details
- 30:38Bytecode and debugging
- 34:03Future with WebAssembly
- 34:55Treehouse integration
- 39:12Emoji search demo
- 41:44Production use and summary
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