Lets collaborate the list of E4 product architecture interview questions in this page, if you know any please continue list in comments

• Design Leetcode (with or without leaderboards)
• Design Real time commenting system for live videos/events in Facebook/Instagram.
• Design Instagram Auction system
• Design Ticket Booking system

If you are anyone you know was interviewing for E4 and was asked any of these question please confirm it in comments.

Let's collaborate!