Kodaii Generated a 20k-Line Fastapi Back End From One Prompt

We’ve been working on the Kodaii engine, aimed at generating complete backends that stay coherent across models, routes, workflows, and tests — not just isolated snippets.

To get a sense of how well the engine handles a real project, we asked it to build a Calendly-style booking system from a single prompt. It ran the whole process — planning, code generation, tests, infra, and deployment — in about 8 hours.

What it generated: - ~20K lines of Python (FastAPI, async) - Postgres schema (6 tables) - Services, background tasks, booking logic - Email notifications - 40 unit tests + 22 integration tests - Docker Compose (API + Postgres) - GitHub Actions pipeline - A running deployment tied to Postgres - Code & live endpoints

Everything is open: Repo: https://github.com/OlivierKodaii/calendarKodaii

API docs: https://calendar.kodaii.dev/docs

OpenAPI schema: https://calendar.kodaii.dev/openapi.json

Admin interface: https://calendar.kodaii.dev/admin

Why we’re sharing this

We think this line of work may be of interest to peers on HN who care about backend architecture, tooling, and large-scale code generation and your feedback would be very much appreciate.

If you inspect the repo, we’d appreciate any comments on:

- structure, - code clarity, - decisions that look odd, - failure points, - or anything that feels promising or problematic.

For those who want to follow the project or join the upcoming alpha: https://kodaii.dev

Happy to discuss details or answer questions.