Friendly start with a recruiter and I got intel from an inside source that they just keep it light. However, that was not the case! It was a regular interview and I was taken back. Would've been nice if they told me more about what they were going to be asking about in advance.
Interview questions [1]
Question 1
Ranging from "Why do you want to work for Slack?" to specific questions about the position, behavioral questions, etc.