I'm running it on Google Container Engine, Go for the main API layer and CockroachDB for the DB. I actually have a blog post in the works for why I chose CockroachDB. The tl;dr Langliter is offline first so most of the data is synced in the background. Therefore some additional latency makes no real difference and the resilience of a CockroachDB cluster is really impressive.

And good eye, it is React Native app. I should probably look into following platform style guides eventually ( I wouldn't count UI design as a real strength on mine :-) )