I have contacted them about a position advertised on their site, made a skype interview after that. After the interview, I completed and sent a small programming task, haven't received an answer after for a long time, they don't answer your questions back either. After like a month, We made another interview which was a lot of awkward HR question ("Did you have any problems in previous places", "What kind of person you would find to difficult to work with?"). And the position I applied (I was not notified) was filled and this interview was for another position, which added more awkwardness. No answer after this second interview, I guess it is a negative.