10x has always been an exaggeration, but I know from repeated experience it is possible to complete projects far quicker than 2x the speed of the typical team on a modern web stack. The way you do it is by writing less code. Typically this is done by using mature software as a starting point, rather than screwing around with the hot new thing. Seems fairly obvious when stated plainly, and yet so many teams make the same mistake of building from near scratch. Even worse, what teams come up with is usually slower to iterate with than existing software, because they approach it from the perspective of building a singular app rather than designing something to build generalized solutions upon.