It consist of three technical rounds followed by Hr round, In first round of interview they asked questions related to Promises (Promise.race and Promise.all with example ) and he asked two sql queries, this round went well I answered all the question correctly . Then in second round they asked me to design a social networking app with schema design and questions related to this, In third round he asked me very stupid questions even interviewer is not sure what he wants to ask me, he asked me to design a system similar to aws lambda then I tell the designing related to lambda then he stop me and was bit confused with the question, then he stops and move to other question then he asked me to design phone authentication, I told everything which I know but he still not satisfied with the answer. then he asked me about event loop with 100 processes at a time, I told him perfectly but still he is not able to understand my solution, like really he dont even have knowledge of it, he just asked questions from some lists, then they rejected me even when I answered two question in last round from 3 asked