A price comparison and price-history platform for books, covering new stock from vendors like Amazon, Thalia and Dussmann alongside used and refurbished listings from Rebuy, Vinted and Kleinanzeigen. Catching the used market is the part the big comparison sites skip, and it is where the actual deals are. A Next.js frontend, a FastAPI backend, and Dramatiq workers doing the scraping off-request, all of it containerised and instrumented — the scrapers are the visible half, but the half that decides whether the site is up is the queue metrics and the browser pool underneath them.
