The team at flat stack has been very helpful to us as we build our app from scratch over several months with them! They are always willing (and able) answer any questions that come up along way through building out an MVP for my startup business - they've done great work so far but I'm sure there's more ahead of me when it comes time launch their services into production mode once everything goes live this summer!! We have had some minor issues getting things set-up correctly initially which was frustrating since all other aspects were excellent though communication between myself personally or via email could be better sometimes if you're not already familiar wth your co workers' names etc., otherwise just awesome people who will do what needs doing regardless how much experience others may say about someone else working here vs theirs because everyone knows eachother well enough internally within these walls :).