It was purely based on your resume and knowledge in computer science domain. You should have the proper knowledge of things mentioned in your resume. HR questions were also asked.

round 1 apt , ( lr , verbal, iq, mathematical problems) round 2 coding , ( DSA data structures and algo. with math puzzles) round 3 tecnical , ( CN, OS, OOPS, JAVA, C++, C , technical questions) round 4 HR (HR takes ur interview}