After more than 3 weeks of waiting after submitting my application, I was contacted by the CTO and we made an appointment for a call 1.5 weeks later. On that date nobody called me and after I reached out to CTO to ask why. They said it was a mistake and we re-scheduled the call on the next day. After a quick intro from the CTO during a call, I was asked to tell something about myself and my experience. After that, I was asked a number of technical questions which can be considered easy for the person who has multiple years of experience in mobile development. At the end of the interview they promised to reach out to me regarding the results, but I've never heard back anything from this them.