I'm building a commercial vehicle sourcing platform for wholesale car dealers. The system scrapes FB Marketplace for private seller vehicle listings, compares each listing's asking price against wholesale market value, and displays everything in a clean web dashboard ranked by profit margin. This is a commercial product — not an internal tool. It needs to support multiple dealer accounts, each with their own isolated data and saved searches. What needs to be built: FB Marketplace scraper using Playwright with stealth mode, session cookie management, residential proxy rotation, and automatic failure recovery. Speed matters — listings need to appear in the dashboard within minutes of being posted. You must have: Real experience scraping login-gated, bot-protected platforms — not just public websites Playwright + stealth plugin experience specifically Session cookie management and account pool rotation Full-stack capability from scraper to deployed dashboard