Developer builds auction engine that blocks seller self-bidding, citing platform rules

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A developer built an auction platform for their own handmade and surplus goods, which had no suitable sales channel. The core engine, written in Python with SQLite, rejects any bid placed by the seller, since platform terms such as HiBid's prohibit shill bidding and can lead to account bans. Bid validation enforces reserve prices, price-band increments and staggered lot closing times, with every rejection returning a specific reason. The catalog also requires condition reports and disclosures so that listings cannot misrepresent items. The developer also sets the buyer's premium explicitly rather than relying on a provider default.

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