Bobble Keyboard Backend Developer interview questions

First, I had telephonic round of one hour. After that, I had 3 hours of technical interview, then I got to meet with the CEO. Later, they told me to finish a heavy assignment, which felt more like a job task than interview assignment. Interviewer was good but somehow I didn't feel positive in their farmhouse office. I refused to do the hectic assignment and thus didn't clear the interview.