Shopify Dynamic Pricing

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The guards are the product

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Overview

Competitor-led repricing for Shopify, built to refuse the moves that would hurt

You want prices to move on their own. You do not want to find a catalogue repriced far below cost overnight because a competitor listing for a replacement part matched one of your products.

The service pulls competitor prices, applies a rule — average, minimum, maximum or median — and writes the new price back to Shopify.

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Evidence

What it looks like running

  • A median dry run over five products: two prices computed, two skipped for having no competitor prices, and the change limit refusing to cut the Baratza Encore Grinder from 169 to 92
  • The local catalogue before a run, each product carrying the competitor prices collected for it — the Fellow Stagg EKG Kettle has none
  • The same run for real against a store that does not exist: both Shopify writes answer 404 and land in failures with the variant ID that failed
  • The webhook verifies the HMAC over the raw body: a wrong signature is refused, a correct one is accepted and the new product is stored with its price
  • The pricing routes sit behind a shared secret — no key and a wrong key both get 401, and the error names the header to send

Engineering

How it was built

Backend & services

  • Node.js and TypeScript pricing service over MongoDB
  • Rules: average, minimum, maximum and median
  • New-condition listings only; multipacks and salvage listings rejected
  • Outliers trimmed before any rule runs; the lowest price must be corroborated before it wins
  • Change limit refuses an out-of-range move and reports the price it would have set
  • A price is recorded only after the write to the store succeeds

Integrations

  • Shopify Admin API for product and price writes
  • Marketplace adapter for competitor listings
  • Public webhook route; pricing routes require a shared secret

Testing & verification

  • 155 tests

Applied

Skills on this project

ShopifyNode.jsTypeScriptMongoDBAPI IntegrationPricing automation

Next step

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