They were hiring students by conducting a nation wide test and then taking technical interview followed by HR interview to the students who qualified for the interview.The interview process was a long one,my interview took about 30min or so,they asked me about the technologies which i didn't know like devops,testing etc.Maybe that is the reason i wasn't selected.

Aptitude with prgoramming and Physical interview totally 2 rounds, in which aptitude with programming round happened online in a authorised center and aptitude will be face to face, they categoprize candidates into three categories based on the performance and the pay differs for each category.