Pros
Pay, perks, and benefits. It comes down to these three characteristics for most people at Twitch. The pay has been excellent, the perks are what you would expect from a popular tech company in San Francisco, and the benefits are what you could predict when remembering Amazon, with hundreds of thousands of employees, is behind the company. You'll be locked in a four year contract in order to get all of what you're worth to them. Odds are you won't want to stay here that long, so keep that in mind when first becoming lured by big numbers and shares of delicious Amazon stock.
Cons
Take everything you think you know about Twitch from the outside and shoot a paper basketball of your expectations and predictions into the nearest trashcan. Odds are you're not just off the mark in your assumptions but frighteningly misinformed at no fault of your own. It is far more corporate and far less exciting than what Twitch Chat would imply...well, unless you're into chaos and juvenile internet behavior in a work environment. It's also important to remember that less than 25% of the workforce at Twitch has been at the company for more than two years. It's starting to get ugly here. At its core - and you'll see this in many other reviews - you'll notice that when employees talk about "culture" at Twitch, they're really talking about the office design and free food. No, really. Take a look at the reviews on Glassdoor and notice how few define their co-workers as anything outside of "[being] gamers." That's because Twitch, since their foundation, spent years hiring notable gaming personalities and "friends of friends" and is now a hierarchical and bureaucratic nightmare. Working hard and wanna get promoted? Good luck! The majority of the managers in place have either been hired from the outside onto teams who've been collaborating for years, or have been close allies and friends to the executive team prior to the acquisition by Amazon. This has led to an impossible journey to promotion for most so expect the title you start with to likely be the one you end up with regardless of tenure. Or if you're "fortunate" they'll change your title to something lofty if you put up enough of a fight with HR. As you've probably read in other reviews, this is running rampant within the company and most people have obscure and meaningless titles of seniority. You'll very commonly have meetings with multiple VP's and Director-level employees only to find out that none of them hold decision-making power. Combine this hierarchical mess with interdepartmental disorganization and you have a company focused on "growth" at the expense of anything resembling a meaningful or healthy work culture. Most teams regularly converse about the fact that Amazon is encroaching a takeover of Twitch because of just how damn messy things are getting here. It's getting so bad that we've lost several business relationships because of how slow our legal and finance teams are at getting contracts executed and payments submitted on time.