Pros
There is a strong learning culture where you are invited to ask questions and get to attend an overwhelming number of events in your first month -- happy hours, soccer matches, bowling, ping pong, karaoke, skiing retreat, etc. People here are friendly, hard working and exceptionally good-looking. The interview is easy if you know your stuff and are willing to make 100 new friends :) Don't be surprised if you fall in love with our CTO, Tom O'Neill, cause everyone does. The upper management is transparent in sharing the company's progress. Oh, and we get delicious catered lunches every day and are moving to SOMA soon. I strongly believe Periscope will go public in a few years; get in if you can, it's going to be a great ride!
Cons
You're constantly challenged to be your best.