My Flask project was 800 lines of spaghetti. Here's the architecture that fixed it.

By week 2 of building my SaaS (Flask + Next.js), my app.py was 800+ lines.

Routes. Stripe webhooks. Auth. Emails. Config.

All in one place.

Every small change broke something unrelated.

So I refactored into a layered architecture:

– Routes handle HTTP

– Services handle business logic

– Models handle data

– Config split per environment

Here’s the full breakdown with code:

launchstack.space/blog/flask-saas-project-structure-production-architecture

Curious how others structure their Flask SaaS projects.