Your question is Top Items and Categories Dashboard. Take a moment with it on the right.
Talk me through your thinking if you like. When you're confident, submit your answer and I'll grade it like a real screen (7/10 or better passes).
Design a dashboard which shows top 10 items and top 10 categories in ebay by number of quantites sold.
Asked in the HM round (design) stage. Reported follow-ups: Explain the item quantity aggregator and category aggregator in detail. Given eBay's traffic volume, how frequently would we write updates to the state store?