After a first skype interview, I was selected to have a face to face interview. This was absolutely not a pleasure. I was asked to solve random problems from number theory. The recruiters just left me with the text of the problems in an office and when I finished I was bring to the door. No chance to make some questions and this is not acceptable if the candidates come from an other country (expenses were not reimbursed). Bigger and more serious companies make this kind of "skill/QI" test online prior the interview..