Shopify Inventory Sync Developer (Node.js + Google Cloud)

We're a jewelry and watch retailer relaunching our Shopify site. We need a developer to build a nightly job that keeps Shopify stock in sync with our store system. What it does Every night our IT team drops a stock file (CSV, about 500,000 rows) into a Google Drive folder. The job: 1. Picks up the newest file and skips one it has already processed 2. Checks the file. If it's missing, empty, has the wrong columns or is much smaller than the night before, it stops and alerts us 3. Matches item numbers to Shopify products 4. Updates stock at one Shopify location, only for products approved for online sale 5. Writes a report of what matched, what didn't and what changed, and sends a short morning summary