first written round(pen paper) : ( write short codes, digital electronics ,puzzles) - 90 questions second round(technical interview ): questions from c++(in depth), DSA and some basic hardware skill testing(even if you have not mentioned in cv they will ask what u know in hardware like 8085,CA etc.) third round : more or less same as second but I was asked to solve some mathematical questions also. Fourth round (hr round): Some basic questions of hr.