When an IT consultant/architect/developer wakes up in the morning he knows that he has to study a new programming language before the fullstack runs away.
And that the new programming language tomorrow is already deprecated.
If you want to save your big fat neck today you have to
Angular and or React (better both, I know it’s not possible if you have also a private life).
If you have to choose today, for example, if you start programming now, I bet on React.
Rest WS as a client
Node.js and or Java (Spring it’s enough).
API Rest WS (Ok with Spring).
But there is good news. All Network layer is simple to manage now, thanks to different infrastructure-as-service like AWS, Firebase
If you know all above things, well, you can continue sleep 30 minutes more!