Thank you for the questions!
1. It’s 30% at the moment. Everything new is written in Kotlin (and e.g. our whole Wear app is), but there’s a lot of code waiting to be migrated.
2. Google’s (Jetpack, Play Services, Firebase, Fabric), Jackson, OkHttp, Picasso, Commonmark, LeakCanary...
3. It doesn’t make a difference. The team is indeed usually between GMT+1 and GMT+3, but we have very different sleeping habbits. 😄 There are no requirements to be online during certain hours or so.
4. That’s an interesting question! Sometimes a cross team pull request pops up and it’s welcome, although it’s more of an exception. We’re also very interested in cross-platform code sharing (since we have clients for multiple native platforms) and we’re excited about Kotlin Multiplatform, but it’s still in the “discussion and evaluation” phase.
5. I don’t know, to be honest.