>>alexas+o6
Literally every post about one of these companies has a comment like this. The issue for companies like AirBNB is not that their application is necessarily bafflingly complex (though it is absolutely true that, especially during the nosql era, amazingly baroque and bizarre architectures had a heyday) but that operating reliably at scale is hard, requires good decisionmaking on multiple dimensions, and requires attention to things that "just CRUD app" doesn't capture because none of them actually matter at low scale.