Housejoy Java Developer interview questions

First round was 5 problems assignment. It was pretty easy. Second round was a technical round.He asked me some basic data structure problems and some question on java 8 . I answered all DSA problems. So everything went fine and at last this guy came saying my DSA was weak which is obviously false and asked me to leave. I could have argued with that guy and known the exact reason, but want everyone to know this, because this happened with me in other companies too.