This is a talk give at @FrozenRails in Helsinki on 11 September, 2014.
API's are all the rage these days. There's even a movement for "API First" development. And that sounds fantastic! But you need the ease of Rails, so that you can iterate, and pivot, and figure out if you've got a viable business. And this could take years.
So you build a web application. And you iterate. And pivot. And you've got a business! And you're growing! And NOW you want a mobile app and another client. Umm, yeah.
Let's talk about you can make the transition to API after the fact, and the things you should look out for along the way.