They contacted me through an external recruiter and asked me to go to their office for a F2F interview. The first interview was not technical, and rather about my career path and so. After some weeks, I had a technical interview with some head of engineering of theirs. He asked me rather theoretical questions about the Android OS and its architecture. I also had to write a test about the Java programming language and C. Few days after, I was asked to complete two online tests, one was IQ evaluation and the other psychological. After some more weeks I was called to be told that I was selected, but I wouldn't join until some months after. In the end, they never called again, and when I got in touch with the HR manager, he started giving me some poor excuses about delays and "potential follo-up" the next year. Of course after this frustrating experience, I gave up with them.