I applied online. The process took 1 week. I interviewed at Mercer (Varsovia, Mazovia) in Feb 2013
Interview
Good experience. Firstly, an easy Excel test (pivot tables, value searching, filtering, vlookup) based on a quite big database. Later - job interview - quite normal - people were very nice. As a plus - I was not very experienced and Mercer gave me an opportunity to start my career. First weeks of work were fulfilled with presentations in order to get acquianted with processes, software, people.