There were 3 interviews and questions were asked from floating point arithmetic, C++ templates, basic sorting algorithms, parallel algorithms and CUDA programming concepts. The first round was fairly straightforward where I was asked to describe relevant projects in my CV followed by a quick question on numerical linear algebra, the second interview was a bit more involved where I was asked to write a CUDA code for image rotation along with questions on performance analysis on GPUs. The last interview was the toughest where questions were based on floating point arithmetic and basic sorting algorithms.