Need a Google App Engine Expert

Trying to switch my app to Google App Engine. It needs to supports an iOS, Android, and web app. I just need a NoSQL db, push notifications, OATH Google User Authentication, and some small compute servers to run jobs.

Can someone advise me on the easiest way to architect this on GAE? Or if there's a better service for this?

Known Languages: Java, Python, Obj-C, A little Javascript