How I built a website audit tool that costs $0.03/audit in AI

I just shipped AuditZap, an AI-powered website audit tool. Instead of writing a launch post, I wanted to share some of the interesting technical decisions behind it. The architecture A user submits a URL. The API validates it, creates an audit row in Postgres, pushes a job to BullMQ, and returns immediately. The client polls every 3 seconds. A separate worker process picks up the job, crawls the site with Puppeteer, runs 24 checks, calls Claude for fix instructions, and writes the re