As you have knowledge of Javascript, I would go towards Vue/React in Frontend and Node (with suitable framework) with backend. From my point of view Java would be too bloated for suggested kind of an app. I myself use PHP as a backend a lot and React as frontend but moving thoughts towards full stack javascript world.
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I've read a few forums claiming that full-stack Javascript applications suffer from speed issues and with handling heavy computing. I don't expect this particular project to have significantly heavy processes but the speed does concern me a little. Do you think that would be an issue?