I applied through a recruiter. I interviewed at Slack
Interview
This was a great experience at it is mostly similar to what we usually have to do in our regular development job. I did not have to take much preparation. Taking a good System Design Course might help answer the questions during the interview. And also knowing and following good coding practices might help.
Interview questions [1]
Question 1
various system design problems, basic coding problems like how would you implement a certain feature in a toy project etc.