[mhahn]

I use Protobufs for my startup and it has saved us an incredible amount of time building out iOS, Android, and Web clients. With a small team, any time we can shave by not having to re-write the modeling layer in all of these languages is a big win. As the writer of the APIs, I publish the new Protobuf models/services and then can switch over and instantly start working with real objects in Swift or Java.

Coming from a larger startup, I've also experienced the pains of trying to maintain JSON objects between different services. Protobufs have some quirks, but I think its a great solution to get behind at any stage.