First apply on their site and then create an account there after that Skill test on hacker rank and after successfully qualifying the test you will be interviewed online. Asked questions on basic Linux commands and some aptitude and reasoning questions.

The interview process starts after passing the pre-employment exam and it just takes one day to received the result of my exam after that the HR contacted me for initial interview after that the second interview was with the team leaders of PSPC department, Third interview was with the managerial team leader.