As they had a low number of interviewers they conducted an E2E interview first before my coding interview. I got a positive response from the E2E but I decided not to move forward. The question was implementing design a "drag and drop" system on a large scale. How can we order the items after the "drop"? What if there are a lot of items? Describe what will be the DB schema, server API, and client logic. What will happen in edge cases and how to handle them.