I applied through university. The process took 2 days. I interviewed at National Instruments (Mysore) in Jul 2017
Interview
1) 1st round written test: 10 questions, 1 and Half hour time. Questions included basic questions on time complexity, graphs, OS, pointers, Digital electronics
2) 2nd round Coding round: 2 questions, 3 hours. Only C and C++ was allowed to use.
3) Two technical interview rounds : CS+EC ( for Electronics students), CS+CS (for CS students)