Booking.com

• Lots of benefits in every area; competitive compensation, endless learning resources' subscriptions, frequent company/team gatherings, extra days off, generous relocation packs for foreigners, commute and bike purchase allowance, etc.
• Well-documented company material; a complete knowledge base for employees explaining everything from benefits to promotion process, etc., internal courses for learning compliance rules, onboarding, etc.
• Diversity; you won't feel left out, even if for some reason you're somehow a minority in your direct team. There's lots of support and great company culture regarding diversity to let you feel included.

• Your satisfaction in your immediate team is not predictable; it might be really shaky. Teams might be new and still developing their culture, or a hard-to-work-with colleague might be in your team. But on the bright side, it's a big company with an infinite amount of small teams that you can aim for.

• If legacy tech is not your thing, you might suffer. You might need to use an old language or deal with code that is super old, and the owners have changed several times, making it hard to solve a problem or find a root cause.

• Lots of internal dev tools are in use; they are not the most stable stuff out there. You may not have the most smooth dev experience all the time.

The career levels need some reconsideration.

There are people with the same career level but a large gap in their knowledge or communication skills.

There are senior people with hard-to-deal-with communication skills.

Perhaps soft skills should be considered more in the promotion process, not just experience.