First, there was a telephonic screening round in which they asked some web-based testing and general testing related questions. They also asked me to write code using the CollabEdit tool.

After that, I was called for an onsite interview, which consisted of four rounds. One round was conducted by the manager, another by a QA automation lead, one by a peer QA, and the final round by a developer from the team I would be joining.

All the interviewers were nice and friendly. They asked good coding and web testing related questions. I was asked to write code on a whiteboard, optimize the solution, and come up with different scenarios to test it.

Nothing as such. You need to have good coding skills and knowledge of QA processes, plus confidence in yourself.