What I Built With The Mullet Method: One Flask App, Multiple Sites

The Mullet Method: Business rules in the front, AI party in the back.

I’ll show you three completely different websites (see URLs below), then reveal they’re all running on a single Flask backend on a $20/month server. The secret? Use AI in the back to create deterministic, ordinary websites up front - no need to run the AI meter for users.

This is pure show-and-tell:
live sites → single backend reveal → development theory → architectural patterns.

Simple, clean, and focused on the core insight that makes it all work.

What I’ll show:

• Three completely different live websites
• Single Flask backend reveal (one process, one database)
• Development theory: AI in back → deterministic sites up front
• Key architectural patterns that make it work
• Why this approach beats running AI for every user request

Key insights:

• Use AI during development, not during user requests
• Database-driven routing eliminates hardcoded patterns
• Single codebase, infinite customization possibilities
• Super low-cost scaling without AI infrastructure overhead