Most backends are built the same way. You define routes. You write handlers. You wire everything together. Over time, you end up with dozens—sometimes hundreds—of functions that all follow similar patterns but live in different places. It works. But it doesn’t scale cleanly. The Handler Mindset A typical backend looks like this: Route definition Controller or handler Validation logic Database query Response formatting Repeat that structure across your entire application. Even if you organize it well, you still end up with: Repeated patterns Slight inconsistencies Logic spread across multiple files You’re not building a system. You’re assembling one manually. The Realization Most handlers don’t do anything unique. They follow a pattern: Accept input Validate it Execute some operation Return a result The structure is always the same. Only the data changes. So Why Are We Writing Them Over and Over? Instead of writing handlers, what if we defined behavior? Not in code first… …but as a contract.…