The whole process was in three steps. The first two rounds were quite friendly. But the final round was unprofessional. The interviewer gave me a coding problem and left the interview saying that he is busy. He told me to send the solution later. But he did not leave me any information on how to contact him. I messaged and called HR for this. The HR texted me an email. I sent the solution to that email and Gmail did not find any DNS. The next day I called HR again but she did not pick up. After that no communication at all. A candidate in the final round at least deserve a rejection mail. This represents a very unprofessional behavior from a software company.