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.