In the Lean Startup order, going by canon, you should start with your front-end and then build the back-end to make it work. So you can actually start right awa

In the Lean Startup order, going by canon, you should start with your front-end and then build the back-end to make it work. So you can actually start right away with the microservice oriented architecture. This will buy you a lot technically in the long-run, so it's usually the best choice. The basic pattern is an app/api split, but it can be extended to describe other parts of your app. Separation of concerns at macro scale is a great idea just like it is at functional level. Even something like dependency management works so much smoother. But yeah, I agree with all the benefits that everyone mentioned in this thread.