fullDuplexxx

...which is pretty much how hashtag-based single page webapps operate.

Many, if not most, isomorphic react/node.js apps have a single API url, with microservices behind the load-balanced URI, that accepts HTTP POST requests, and looks at a JSON object sent as the request body, in turn responding with a JSON object that informs the client-side app to re-render accordingly.

This isn't bizarre at all. It is very, very common; if not the norm.

I have never seen anything on Glassdoor or LinkedIn worth caring about, ever.

I spend almost all of my time avoiding both places and giving zero fucks about the people that get sucked into those whirlpools of desperate flailing for attention.