Hi folks. According to this video https://www.youtube.com/watch?v=JnmHqKLgYY4 JetBrains
fully written in Kotlin (server, mobile, web). Web version uses Kotlin ReactJS wrapper I think.
Jetpack Compose for Web is really shines in this situation. It almost fully Kotlin solution (we still need some browser specific features, maybe some libraries helps minimize manual manipulations) which could reuse more code with Android (UI logic composables, etc). That is, we get more ergonomic approach for building cross platform UI in Kotlin.