Pros: Github, Slack, security, and complacency, if you're into that kind of thing.

Cons: Internal tools like email and calendar are impossible to use. Modern companies use Gmail or Exchange. "Success" is defined by sales revenue, not usability or quality. VPs are very boring, grandparent-like, and submissive people who don't think outside the box and probably haven't seen much of the world. Culture is about fitting in and not standing out. Instead of using good tools like AWS (that most IBM employees want to use), IBM tries to take it on with the IBM Cloud. Ask a good systems or dev ops engineer what they really think about IBM Cloud. Don't take on a giant; use them and pivot your business to improve your quality.

Pros: Good company for growth perspective.

Cons: Salary increments are quite low compared to others.

Pros: The total compensation package is good, and there are plenty of good people to work for and with. There's a wide variety of work to do within IBM, so there are sometimes good opportunities to change jobs internally.

Cons: Not the stable job it once was. Regular layoffs are a matter of course now, and indications are that those jobs will move overseas and not return to the US. Since IBM seems more interested in buying new technology instead of creating it, you're better off being in a company bought by IBM if you want new technology experience. IBM cares much more about the stock and how the world perceives it than how employees feel about the company, and that leads to poor products and support.