The Slack origin story

Let’s rewind a decade. It’s 2009. Vancouver, Canada.
Stewart Butterfield,known already for his part in building Flickr,a photo-sharing service acquired by Yahoo in 2005, decided to try his hand — again — at building a game. Flickr had been a failed attempt at a game called Game Neverending followed by a big pivot. This time, Butterfield would make it work.
To make his dreams a reality, he joined forces with Flickr’s original chief software architect Cal Henderson, a