I went through about 6-7 rounds of interview to meet with 9 interviewers. The first round was a telephone interview who asked friendly questions. More indepth and difficult technical questions would be tested on round 2 onwards, mostly were telephone interview. They would ask which area is your strongest technical skill set and asked questions in that area. In the later rounds of interview, they would go through some management cases with you. They dont need candidate to be an expert in particular technical area but look for a real technie fans (but not computer geek)

I applied through consultant. Got call after 3.5 months. It was for Strats team, so interviews level were tougher. There were 10 rounds with all the senior members of the team. If all the members vote yes for you, then only you get selected, else you are rejected. They go to great lengths to ensure this. Even the Vice-President of the Divison calls you from London, and takes your interview. It was difficult