Pros
At Booking.com I have met by far the highest percent of smart people, genuinely willing to help you, wanting to do the right thing, open to hear your feedback and act on it and also to provide you feedback. Most of managers are open to be challenged, decisions are made based on data/reasons and not on "rank". Great office, great opportunity to meet different people and work in a truly international environment.
Cons
Codebase is very bad, I have spent weeks to struggle to add some functionality that might have taken me 1-2 days max to implement in a clean code or from scratch. We are doing progresses but unless you are on a good project with newer tech, dev experience can be a pain and growing from a technical point of view can be limited. Also, there is no baseline between teams/departments: from technical, functional, UX but most importantly from a performance evaluation point of view. I have seen people being over-appreciated in some areas that would be really under performers in other areas and vice versa.
