Pros
Growth mentality: Senior management sincerely wants everyone to thrive in their careers and personal lives and they walk the walk when it comes to healthy work-life balance, and helping you to improve your skillset.
Building cool stuff: Working with cutting edge technology while enjoying a fair degree of autonomy to experiment and adapt without excessive oversight.
Flexibility: Any engineer can WFH on Tuesdays and Thursdays, or any other day when circumstances require (contagion, children, contractors etc.).
Compensation: Pay is competitive and benefits are fairly generous. The stock you get is real stock, with actual cash value the same day you get it. Extra paid time off around the holidays that doesn't count against PTO is really nice.
Work environment: People are genuinely friendly and collaborative. Office managers go to great lengths to make it a nice place to work where people are treated like adults. Feel like a beer with your lunch? Pour one from the taps in the kitchen and enjoy. You're a grown up. You can act like one here.
Perks: Free healthy snack food, coffee/cold-brew/tea, beer on tap, kombucha on tap, professionally catered breakfasts and lunches once a week, sponsored social gatherings outside of the office, paid parking, professional conferences are encouraged. The list goes on.
Cons
Honestly my only gripes are likely to be present at any company with > 1000 employees: Excessive email noise, big-corporate lethargy, mandated HR distractions, politically motivated "bias" training to appease the hash-tag lynch mobs etc.