I've really enjoyed building on Google App Engine. (Disclaimer; I work for Google, but not in engineering) You can use the Datastore for NoSQL data, or connec

I've really enjoyed building on Google App Engine. (Disclaimer; I work for Google, but not in engineering) You can use the Datastore for NoSQL data, or connect with CloudSQL if you want to use a traditional MySQL database. It's quite forgiving when it comes to mistakes; and GAE will automatically spin up new instances as traffic warrants. (No need to manually add/remove dynos). I know people have had problems with support, but at the same point I understand that if you pay the ($500/year?) for Premium support that the team is really responsive. For me, as a very novice developer, I had enough on my plate building my app. It was nice to leave ALL of the sysadmin work to App Engine...