Suppose you have been given 100,000 developers to work on a website, but it will have millions of customers and things cannot fail.

Now it is actually useful to be able to parcel out the database layer to a group of 1000, and they can split up each service into groups of 100 etc.

There are enough people to decide what conventions, logging, validation people ought to use and perhaps measure them. If all of them hack on the same Rails codebase they might be running into each other all the time.

Of course, for a solo developer, it makes sense to use Rails/Django/etc.

Now there is a little spot in between 2-99,999. It is possible that there is a team or two at this level. And I think that gear shift or pathway has not yet been discovered. Typically you start on rails, suspect you should switch and then switch way too late.

A pathway might look like this:

Django -> Django API + VueJs -> Redis + update database?

It probably depends on the challenges.

If someone has an idea, or something they have tried, it would be interesting to take a look so please share.

Edited for clarity.