The AI Builder Stack: Linear, Cursor, Vercel, and QA.tech

Manual testing can't keep up with how fast teams ship code. This article walks through building a checkout flow using Linear (planning), Cursor (AI-assisted coding), Vercel (instant deploys), and QA.tech (AI testing automation). QA.tech replaces manual QA by auto-generating E2E tests from plain English, running them on every PR, and catching bugs before merge -- no Playwright or Cypress scripts to write or maintain. The full cycle from code push to tested deployment took about 5 minutes.