Meta

Salary/perks/401k contributions.

A lot of really smart people to learn from and grow your skills. Well-seasoned "engineers at heart".

Access to incredible scale (of systems) not present outside of FAANG.

If you get lucky, you'll get a good manager who has your back and maintains integrity and helps you grow. If you're even luckier, you'll get into a functional team with reasonable expectations.

• Lots of toxic senior people and management that will use any excuse to cut you down and lie to your face repeatedly without consequences.
• Lots of insufferable politics that leave services in a terrible state, and the team ends up with a really high turnover rate because no one wants to stay.
• Extreme, constant, and unnecessary pressure to "perform" that may leave you with poor mental and physical health.
• If there are no metrics to back anything you've invested effort into in order to do it right or better for the long term, it didn't happen and it doesn't matter.
• Be prepared to constantly defend your entire existence and worth, especially if you're an early-career engineer. There's no trust in engineers, only engineers who become at least part-time politicians. Be prepared to become a blogger so you can advertise everything you're doing to people who don't care by posting to internal groups so that it looks good in front of management and is easier to "sell" during performance evaluations. An introvert's nightmare.
• There's no "bottom-up" culture anymore; you do what you're told, or else.

Don't disregard your reports when they tell you there's a problem with how they're being treated, or treat them like the problem instead of addressing the issues they're raising.