Auction feature on Instagram
- People can create auction posts and add products
- People can bid on products
- When the auction ends, people can buy the product
- Anyone who can see the profile can see auctions posted in their feed
This question asks you to design an Instagram-style auction feature where users can create auction posts, place bids on products, and buy the product when the auction ends. The main challenge is modeling the relationships between posts, products, bids, and auction states, while also handling feed visibility for users who can view the profile. A strong solution should discuss data modeling, state transitions, access control, and scalable feed distribution.
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