Normal application into phone screening with standard behaviorals. Had a pretty fast turnaround into a 3 round superday. Got tripped up by a merger math case but heard that other applicants didn't have the same. Techs were easy other than that

1st round behavioral, 2nd round technical, 3rd round super day 3x interviews with analysts, associates, and directors (1 behavioral, 1 cultural, and 1 technical). Fairly straightforward process, just study some technicals beforehand and have a good answer for why you want to work in IB.