I like you are having success here, and the key item "natural communication lines" which I very much agree with. We will always deliver conway's law.

I am curious on 1) the size of your teams, and 2) your opinion on how this would work with E2E product domain based teams (mixed skill sets) vs skills based teams e.g. User engagement team (front and backend devs covering sign on, emails, etc) vs Backend engineers (maintain all backend systems, etc).