First, there are three coding questions to be completed online. Then, if you get to the onsite interview, there are two back-to-back 20-minute interviews and a 3-hour case study.
Basically, stuff on your resume.
The following metrics were computed from 363 interview experiences for the IBM Software Engineer role in United States.
IBM's interview process for their Software Engineer roles in the United States is fairly selective, failing a large portion of engineers who go through it.
Candidates reported having very good feelings for IBM's Software Engineer interview process in United States.