1) A large company that is completely out of touch with modern development practices.
2) No concept of agile with all "requirements" living within a single wiki document with insufficient details to actually build anything. Tickets are constantly single line descriptions often along the lines of "just do what this other team did"
3) Team structure is extremely siloed with no communication between teams and no technical documentation to allow for sharing of knowledge.
4) They are attempting to create cross functional teams but continue to silo developers with specialization (complete with separate sprint boards, backlogs, and goals) resulting with poor communication even within the team.
5) Any attempt to suggest changes or allow a team to properly self organize results constant resistance and if you push and idea through if often ends up requiring a committee of managers to modify the idea so completely that it loses all effectiveness
6) Benefits package is subpar especially when it comes to the health benefits to the point that you have to pay extra via deductions in order to bring it even close to levels I have experienced at much smaller startups
7) The quality of developers you will work with is questionable at best with many of them pushing to do the absolute minimum in order to be able to call a project complete
8) Yearly bonuses are tied to project completion to the point that many of the developers have completely lost interest in building and maintaining a quality product and only care about completing the project on time/early.
9) First place where I have ever seen a developer argue that copying and pasting code into multiple files and attempting to modify the 3 values that differ between them is the better option that building an extendable system
10) expect to be invited to dozens of company wide meetings that chew up a ton of time and accomplish very little. I literally have been in 3 all hands meetings in 3 weeks.
11) Your email will be spammed to death with constant emails from every other developer asking for help on fixing the constantly breaking development environments (for environments that you don't work on)