IBM will silently laying people off after the stock crash... From what I've seen, this is how they do it:
They suddenly label people as "low performers" (making up stories if they have to) and try to push them into quitting.
They put people on PIPs (1–3 month Performance Improvement Plans) and then fire them. The goal seems to be avoiding severance.
They make your work life miserable until you leave on your own.
If you're thinking about joining IBM, I'd honestly look somewhere else. In my experience, the company doesn't have many interesting projects anymore, and management is pretty bad. Most managers have no clue how to lead or manage teams.
Just my opinion based on what I've seen in this company over the years.