There were three interviews, we had two interviews by phone, and the last one was a face-to-face interview. The telephone interviews were easy to succeed, there were typical questions like design patterns and some basic JavaScript questions. After the first phone interview I had to write a code test, it was a ticket sorter API. They outlined the BIG-O-NOTATION, and the reusability of the code(OO preferred :-) ). The code test had to be completed within 2 hours. The last step was the face-to-face interview, of course in Madrid, where I met 5-6 people of Tuenti. The whole morning was taken up by interviews. The first one was a personal interview including a detailed description of the company and bonus benefits and so on. In the second and third they tried to highlight my technical skills and experiences. Both tech questions and IQ questions were asked.