Stage 05 of 5 · PDLC: Development
What is the Develop stage?
By Heemang Parmar · Updated July 2026
Develop is the development stage: the specified, designed product becomes a real codebase in a live cloud sandbox, tested in a real browser and deployable to production on your own domain.
Development is where most AI tools finally start; in ProductOS it is the last stage, and everything upstream exists so this stage builds the right thing. The implementation agent inherits the PRD, the design tokens, and the full project context, so nothing has to be re-explained.
The Fullstack Builder is a real coding agent running in your project's isolated sandbox, editing files and running commands against a live preview. On demand, the QA Agent verifies the app in real headless Chromium and can chain failures into automated fix runs, and the Deploy Agent preflights the build, pushes to your GitHub, and ships to production with up to three self-fix iterations.
Which agents run the Develop stage?
How does the Develop stage work?
- 1Build in the sandbox: The Fullstack Builder implements the spec on your design tokens, with a live preview as it works.
- 2Verify with QA: On demand, real-browser tests cover critical flows, APIs, accessibility, and console errors.
- 3Fix the fails: A failed verdict can chain straight into an automated fix run.
- 4Ship it: The Deploy Agent preflights the production build, pushes to GitHub, and deploys to your domain.
What does the Develop stage produce?
- A production codebase, synced to your own GitHub repo
- QA verdicts with severity-ranked findings and screenshots
- A live deployment on your own domain with SSL
Frequently asked questions
Do I own the code the Develop stage writes?
Yes. Generated code syncs to your own GitHub repository as it is written, you can export everything, and the deployed product runs on your own domain. There is no lock-in.
Is the output a prototype or a real product?
A real product: a conventional full-stack codebase with auth, data, and APIs, tested in a real browser and deployed to production. The showcase lists shipped products running in the wild.