This is solid - thank you very much. We will do some more research but basically sounds like - go as low as possible, as long as the underlying libs support it.

This is solid - thank you very much. We will do some more research but basically sounds like - go as low as possible, as long as the underlying libs support it. And re: kotlin - I last worked/played with it in 2016 and recall that it was MUCH nicer to work in compared to Java. I just did a quick cursory look and it seems like Kotlin only has slightly slower builds compared to Java and rest of perf is basically the same due to generating similar bytecode. Neat!