Hi,
We’ve just started using Parse Server in production, for now we’ve clustered only the DB and Redis, but we’re planning to cluster Parse Server too. I’ll keep you posted on my experience in the future.
Our project is a live trivia, “à la HQ Trivia”, for now only web based. We mix Parse Server with Firebase for auth and messaging.
If I may, I found the docs somewhat stale on Live Query and it took me a long time to get the setup right. Maybe it’s a potential area of improvement!