I applied online. The process took 1 day. I interviewed at Opera Solutions (Noida) in Aug 2012
Interview
CAT difficulty aptitude followed by an Excel Test with most Vlookups and Excel functions questions.3 rounds of Interviews which will happen if you clear the previous rounds.One telephonic round with the Manager and PI with problem solving questions and guesstimates.Can even ask C C++ and SQL questions.
I applied through college or university. The process took 1 day. I interviewed at Opera Solutions (New Delhi) in Dec 2011
Interview
One written exam to startwith, consisted of both objective and subjective questions..simple class X maths, Data interpretation questions, time limit 1 hr..in all, 6 subjective (which also had 2-3 standard puzzles) and 20 objective..
interview consisted of 4 rounds, 2HR (questions on resume, projects, internship), 1 case study, 1 puzzle round. Each for a duration of about 30 mins. In the case study round, I was asked to price an airline ticket for company..several economic parameters were given..