Was invited to a face to face interview at Siemens' Pune office through an external agency (Siemens hires almost exlusively off of job agencies)
Two interviewers asked me questions about C/C++ object oriented, multithreading concepts and a few system design questions. Overall not a very difficult interview, they focus on your approach towards problem solving and general attitude. Got through technical interview 2 rounds easily and 3rd final round with HR was full of typical wierd questions (Where do you see yourself etc).