I applied through an employee referral. The process took 2 months. I interviewed at Slack (San Francisco, CA) in Sept 2017
Interview
Phone screening first. Than homework to show skill and knowledge - nothing tricky, just what i did on my previous job. Very well prepared and focused onsite interview. Everyone was super friendly.
Interview questions [1]
Question 1
What challenges did you encounter at work?
How do you approach problems?
How do you prioritize work?
etc.