First round: OA with 4 questions: 1 easy, 2 medium, 1 hard. I think the last two questions are quite difficult (one needs to use a sliding window algorithm on a string, and the other is to perform operations on a matrix).

Technical interview with 2 problems: 1 easy (valid parentheses string) and 1 medium (balance a BST tree).

Final round (after a week from the first round): 2 coding interviews with 2 medium questions each. 1 behavioral interview.

Offer (a week later).

As described above, behavior questions usually ask about your previous experience working with others and how you solve a problem.