"This is fairly straightforward; professional software developers of all levels usually have some experience building and scaling stateless APIs." I would ques

"This is fairly straightforward; professional software developers of all levels usually have some experience building and scaling stateless APIs." I would question this, in fact suggest the complete opposite. Given that they say they're a team of Scala developers, I think there is definitely some selection bias going on -- in some subset of the wider population of developers that might be the case, but certainly not globally.