IBM

They are hiring a lot of younger folks, which is good news for new grads. They have a number of decent long-term projects, and as long as you're getting your work done, you have good job security.

They underpay, hard. They are not competitive, especially at the entry level. Older, long-time employees have benefits that new employees can't even get anymore (smaller PTO ceiling, etc.). Generally, the government contracts work with outdated technology or in-house stuff that nobody outside would have even heard of because nobody else uses it. There are popular, well-functioning alternatives in basically everything. Raises are done on a schedule and are incredibly difficult to negotiate.