@cebe I'm in the backend world 99.9% and the remaining 0.01 is some jQuery, for the past... many many years. I can offer a tap on the back or a shoulder to cry on 😄
On a more serious note, I'd really try to start with something very simple. In fact, if the web (browser) is the only frontend that the app has, then I wouldn't use any frontend framework. Vanilla js, jQuery or something similar at most.