We don't know Kotlin. We both have some prior Java experience, but it's not our preference.

Since the original codebase is in Python, I would have used that if possible, but I spent eight weeks failing to load a shared object into a Python interpreter on Android. That got us to this past January.

I have had a Haskell job before, though I was entirely unfamiliar with Android dev.

In two days I was able to load a shared object into a Haskell interpreter on Android, so we tried that route.

I see, given the pain of using the NDK, and having to make use of JNI for any meanigful Android API, that approach seemed quite strange, when only having to target Android, hence the question.