I think the key factor that defines what flipkart expects of a potential employee is "good problem solving skills". I guess they really look at understanding how you approach problems and how you can convert a design to code effectively. The interview process was spread over three days with two telephonic rounds and a day of 1:1 interview. The HR team was very prompt in responding back after each round and Flipkart really kept their word about the time taken to get back.
Telephonic round: I'm not sure how much this helps, but during the telephonic round, even if you don't know the answer, think out loud so that they know your thought process.
1:1 round: This took place from 10:00 to 17:00. There were 4 rounds and each round had a significance. Again, think out loud if you don't know the answer (But, that doesn't mean you think out loud irrelevant solutions. It could go against you )