Comment by skaphan

But ... in the one case we are aware of, of a whole company, Amazon, using a service oriented architecture, they did it after the fact. The did bolt it on later, or rather, they (according to Steve) ripped everything up and re-did it in this way. I'm sure it was absolute hell to do this, but that is what they apparently did. So it isn't a requirement to build a platform first, then build everything else. It might be nicer to do it that way, if it's the best prioritization of resources at the time, but that's not what happened in the case being discussed.