GitHub has a wonderful team full of upbeat, talented, hard-working, transparent, dedicated, and diverse employees; over my month of interviewing with several people on the team (from EA's, to HR, to Managers/Execs), I can easily say that each conversation made me even more excited than the last and never felt like a "chore." I honestly believe that they believe in the success of their employees and want you to feel like family.
This was, by far, one of the best interview processes I've ever had the pleasure of being a part of.