Novoda interview questions

I have applied online, then received a follow-up email to schedule an intro call. After the very friendly call, I was invited for an on-site meeting and had a pleasant 45min chat with current design lead and one of the designers. They promised to reach out soon, so after a week I received an email asking to share my availability for another call. There weren't any kind of feedback on previously held interview or further steps. After I shared my availability the same day, there was no response for a week so wrote them again, asking for the feedback, on which they replied, asking me again to schedule a call / share my availability. After doing so again, I haven't heard from them ever since. So overall experience started very positive, and ended very unprofessional and like complete waste of time.

Applied through the pages , then had the normal flow of having an HR interview call with basic questions, then an iOS interview which was pretty easy, was made through Skype as the interviewer was in london office. afterwards I received an invitation to visit Berlin office and meet a couple of android guys for a chat, I had lunch with them and it seems it didn't go pretty well, what was frustrating that though I accepted twice a last minute cancellations or mis-planned interviews from their side, is that they didn't even send a rejection email or replied for my request for feedback, really the level is below the lowest startup and more than unprofessional. I totally regret every minute I spent in this interview.