Cure.Fit Software Development Engineer II interview questions

I applied for the Frontend Engineering role through a linkedin recruiter. This was an interview drive on Saturday. There were total of 4 rounds (3 technical and 1 cultural fitment round). Each round was elimination round according to them. Round 1: Some verbal questions related to JS/React and a live coding session in which I was asked to build a small application using vanilla JavaScript. Round 2: Problem solving + some performance optimisation questions Round 3: Design round, verbal round in which I was asked to design some collaborative paint app. After all the technical rounds I didn't got any call on from them until Monday (Today) they just shamelessly sent the rejection email without giving any feedback. I wasted my entire Saturday just to receive this email. I will never sit in an interview drive after this.