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How WhatNotSell built a deal site that only shows verified, real discounts

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A team built WhatNotSell, a deals platform designed to display discounts only when a product's original price is genuinely higher than its current price, rejecting retailer-supplied "compare at" figures. The platform processes roughly 11,000 live listings daily from over 180 stores across affiliate networks including Awin, CJ, and Rakuten, as well as eBay and Amazon. A single shared function enforces the discount rule across all data sources, a safeguard the team discovered was being bypassed by two of their own import routes during a code review. Product categorisation initially relied on an LLM but was replaced with a deterministic, keyword-based pipeline after costs scaled with volume and errors proved difficult to trace or correct. The team also implemented a transparent deal-scoring system that recomputes scores from scratch each time, factoring in discount size, retailer trust, price history, and community votes.

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How WhatNotSell built a deal site that only shows verified, real discounts · ShortSingh