It's like watching Get out The supposed process includes: Phone screening, Coding challenge, Team leader interview & CTO interview After passed the first 3 rounds, I was asked to have an additional team member interview, which is fine by me. The interviewer is introduced as a Senior Fullstack developer. ... - Interviewer(In): Do you work with React? - Me: Technically, no. I'm currently working with Angular, but I used to work with Preact before - In: What? - Me: React with P, P.R.E.A.C.T. In fact, they have the same API - In: Ah, I found it. Do you know the "store"? - Me: You mean the state management? - In: Yes. Do you work with Redux? - Me: No, but I'm familiar with the principle. And in fact, I found redux is quite verbose and I created a small library that shared the architecture with redux. I used Immutable and also Observable from Rxjs - In: What? - Me: R.X.J.S. Using reactive programming - In: Ah, I found it ... I didn't realize that he was not familiar with these principles. After a couple of hours, HR called me and said they will not going forward with my case. The reason is that I don't know how to use React/Redux. I tried to explain (my biggest mistake!) and she added: the Interviewer refuses to "train" me because he has other tasks to do. May be I'm not qualified. But if a team member refused to help others in a relatively small team is a big red flag to me. She kindly told me that she will discuss with the team leader again and see what they can do knowing that both sides what to end the process. The process was fine before this interview. However, the inconsistent of the overall process makes me frustrated.