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A clean Flutter architecture is less about dogma and more about making business logic, UI and infrastructure evolve without fighting each other.
Architecture only becomes visible when it is missing. In Flutter, the pain shows up quickly: logic leaking into widgets, hard-to-test features, API calls scattered across the UI, and fear every time a new requirement lands.
That is why I use a pragmatic form of Clean Architecture on products that are meant to live beyond the first release.
The core idea is simple: data access, domain rules and UI concerns should not depend on each other randomly. Repositories isolate infrastructure. Use cases express business actions. The presentation layer orchestrates state and rendering.
This makes the system easier to reason about, especially when the team grows or features pile up.
Repositories are especially useful when the backend can evolve. If the product starts on Firebase and later moves partially to Supabase or another API, the abstraction pays off.
It also improves testing a lot, because the domain can be exercised against mocks without dragging infrastructure details into every test.
I do not push the same architecture on every project. A two-week MVP does not need the same layering as a multi-year mobile product with real business rules.
The important part is to make the architecture proportional: enough structure to protect the product, not enough ceremony to slow it down for no reason.
Conclusion
Clean Architecture is not a ritual. It is a tool for products that need room to grow. Applied with discipline and proportion, it turns a fragile app into a system the team can keep improving with confidence.
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