An in-depth, real-world talk on Jetpack Compose and Compose Multiplatform: not just "hello world," but how to actually ship real apps across Android and iOS. We'll cover advanced UI, state, navigation, theming, what patterns work, what breaks, and when to use shared vs. platform views. I'll show code, hard-won lessons, UI bugs, and honest workarounds. This is for devs who want to move from "hello world" to actually deploying multiplatform UIs that scale and pass review.