A brief introduction to https://github.com/square/workflow/, presented to https://www.meetup.com/GDGSanFrancisco.
Original deck: https://docs.google.com/presentation/d/1-LLSFlGcD0fMaVbCn75Q4hgK6_E-YaAv0aI3OcQEHi0/edit#slide=id.g4088c7565d_2_5
Live code source: https://github.com/square/workflow/pull/413