I'm CTO and co-founder of KeepSafe. I spend 3 years on Android development and since March 2015 I'm working mostly on iOS (Swift). Our user base is over 40m users.

At KeepSafe we're working on slick mobile app and run into problems of scale. This is the core driver of my questions asked here.

We are supporters of open source and hope we wrote some stuff that makes development easier. See more: https://github.com/keepsafe

If you're interested in working with us in San Francisco, send me a email or tweet.