Pros
Stocks, business travels, snacks, free lunch.
Cons
There is no such thing as a work-life balance. Be ready to work as much as you are required to. Twilio is an international company, and nobody cares if it's already night on the other side of the ocean. Think twice on every word you say, as anything that can be interpreted as an inappropriate language can and will be used against you during performance reviews or as an argument to put some pressure on you during any other work-related topic. Don't expect any cooperation between teams: people are reserved and try to avoid irritating authoritarian management by personal initiatives since it leads to even more blaming. Overall the atmosphere here resembles an army: there is always an artificially created lack of resources (unrealistic deadlines, missing conference rooms, poor equipment, etc), limitless understanding of whole picture by common employees, punishing and oppressing way of motivating people to work. This seems to work for business, but it's dubious deal for a regular employee.