5 rounds (1 Phone call, 3 technical, 1 HR).

If failed at the last round, it is possible that you will be transferred to different teams (subject to availability).

I would say the first 2 interviews are kind of easy, but the last one varies wildly, depending on the HM.

I believe the experience per person should be different, because sometimes it can be heavy on system design, sometimes it can be heavy on JS/React.

For a coding question, flatten an array and remove duplicate elements.