IMO it&#x27;s dead easy to create APIs from a database schema, where that schema underpins your monolith and you&#x27;re opening said monolith up to the outside world, and you don&#x27;t really care too much what goes on out there.<p>But if you&#x27;re building a system which is not a monolith, and instead is made of up of, say, 20 services, then putting good boxes around those services and defining the lines that connect them (the APIs) is an essential prereq to designing the databases that sit inside the boxes.<p>(Though really what&#x27;s happening, as always, is you&#x27;re doing it all in parallel, just with more emphasis on the higher level stuff).