This is only slightly on-topic, but regarding the service-oriented architecture that he mentions at the beginning of the article, how would one implement this internal? Specifically, how would you communicate with your internal services? Just an HTTP API? Is that fast enough? Another thing I'm wondering is what's the best way to handle internal authentication between your frontend and some backend service for example? Sorry if this is too specific for this discussion, but I've just always wondered this and I figure that HN knows.