GrabOnRent Software Developer interview questions

The interview process consisted of 3 rounds. First there was a phone interview where I was asked basic DS Algo questions along with basics of Ruby on Rails. In the second interview, I talked to one of the co founders of the company who asked me a design questions and some RoR related questions. Thirs round was with the HR who had really bad attitude and was asking irrelevant questions which I couldn't answer in order to negotiate on the salary. After the interviews I was given the offer and I accepted it in 2-3 days. But after I resigned from my current company, they rescinded the offer after 1 week. Never believe in this company for your future. They gave me the reason that there is a change of management which was so unprofessional.