I applied through an employee referral. I interviewed at Optical Fusion (Bengaluru) in Feb 2013
Interview
2 technical and 1 Hr round
First ask C based questions like length of string, reverse a string.
basics of C++ like oops concepts.
basics of operating system.
some puzzles.
After everything clear they ask to fill bond for 2.5yr duration.
After 1 week i got the offer letter.