Pros
Mixed environment. Old school engineering teams from 777 days and prior are thinning out, the people and skills that were the backbone of making Boeing successful. If you are lucky to work in one of these teams you will learn a lot.
Cons
Replacing the old school teams is a bureaucracy of middle management and project managers that act as intermediaries for upper management that need basic information fed to them in stoplight charts. Red is bad, yellow is caution, green is good. Anything deeper that requires the management to expose thier lack of skill so they start yelling and telling you had bad you are, you are not a team player, etc. The original 777 took 5 years to develop a clean slate airplane. 777X (a derivative of the 777) started in 2013, was supposed to be done in 2019, and won't be delivered until 2027 if they are lucky, 9 years longer than the original. This is pure and simply because of all the middlemen who don't add value. These middlemen didn't exist before. As a new hire out of college I had meetings will Alan Mullaly. Today's Boeing the leaders are layers away, hiding behind the middlemen. This leads to politics, CYA, you name it.