Online tests are hard but quick. Don't get hung up on questions, as they are not too bad.
An assessment centre day follows, possibly with a further telephone interview to match with a manager.
General questions:
Teamwork, Leadership, etc.
Examples for each of the IBM competencies.
The following metrics were computed from 32 interview experiences for the IBM Software Engineer role in United Kingdom.
IBM's interview process for their Software Engineer roles in the United Kingdom 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 Kingdom.