I applied online. The process took 1 week. I interviewed at Slack in Oct 2017
Interview
Chatted with a recruiter, got sent a coding challenge and then got a no. based off of the coding challenge. The recruiter really wanted me for the position, but everyone has to pass the coding challenge no matter what role in the company you take.
It was ok, but I didn't really enjoy the lack of free lunch and free items at the lobby. The receptionist didn't seem friendly. At least the interview was easy.