I joined as a fresher, and they conducted a written test, two techinical rounds and a HR round

Interview was pretty easy as I was interviewing for a mid level developer role. It really depends on who you interviewing with and what level position (entry, mid, senior, architect, etc.) as the company is really big and has a lot of development teams all over the country. I don't think they care too much about being a cultural fit or anything like that because they are just dying for new developers due to the high turnover rate.