I applied through an employee referral. The process took 2 months. I interviewed at Slack (New York, NY) in Jan 2019
Interview
Brief intro call with a recruiter; introduction call with manager; chronological interview with multiple managers; in-person presentation with multiple managers. My process took multiple months due to difficulty scheduling the final round in-person interview around holidays, but I always heard back very quickly after each step in the process.
Interview questions [1]
Question 1
Tell me about a time you received a piece of difficult feedback.