Why Layer Separation Matters in Backend Projects
Controller, service, repository — each one has a purpose in backend design
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When I started building backend systems, I used to write everything in the controller. It felt fast. Direct. Efficient. But over time, it became messy, hard to maintain, and even harder to test.
Creating clear boundaries between layers — such as controller, service, and repository — is more than just a best practice. It's about long-term clarity. Each layer serves a role. The controller handles input/output, the service layer contains business logic, and the repository abstracts data access.
Once you start thinking in layers, code becomes easier to reason about.
There are still moments where I'm tempted to shortcut logic into the controller, but I remind myself: structure pays off.