Firstly they have taken a written round then following two technical and one HR. You can follow written pattern in the official website. in technical round it will take 1 to 2 hour. Interviewers are very user friendly. they ask about basics only that mentioned in resume.

first round was an online test .visit their website to know the pattern of this online test, its mentioned there everything. second round was f2f interview....interviewer was really friendly...instead of asking questions...he discussed every thing with me... it can be a long one...but the environment created by the interviewer was so friendly,it didn't felt like spending almost one and a half hour. then a simple hr round...asking if i was willing to work on changing technologies(java,c,c++), willing to relocate etc. then a short f2f with a senior member...a very few random basic questions...like difference between inner join and outer join, virtual class, reference variable in c++, time complexities of various sorting algos., how we calculate time complexity.