All 7 Flutter App Architecture with Modular Feature Folders questions
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Why does a small, simple Flutter app often not actually need a genuinely complex, formal architecture, and at what specific point does adopting a more structured approach typically start to become genuinely worthwhile? How should shared code, such as common reusable widgets, utility functions, and core services, be organized within a feature based folder structure, given that this kind of code is not genuinely specific to just one single individual feature? How can a feature based folder structure be further organized internally using distinct architectural layers, such as separating presentation, domain, and data code within each individual feature? How does a well organized modular feature folder structure specifically make it genuinely easier for multiple different developers to work simultaneously on entirely separate features without frequently causing disruptive merge conflicts with each other? How should an architecture properly enforce module boundaries between different features, ensuring one feature genuinely does not develop an unwanted, tightly coupled direct dependency on another entirely separate feature's own specific internal implementation details?
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How can a large Flutter application be split into genuinely separate internal packages, one for each major feature, using a monorepo approach, rather than simply keeping everything within just folders inside a single unified app?

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Answer

For a genuinely very large Flutter application, particularly one being developed by several separate independent teams, splitting major features into their own entirely separate internal Dart packages within a monorepo, meaning one single shared repository containing several genuinely distinct packages, enforces considerably stronger boundaries between features compared to simply using folders alone, since a package's own public interface deliberately controls exactly what other features are actually permitted to depend on and directly access, and tools such as Melos specifically help manage versioning, dependencies, and running commands consistently across this kind of genuinely more complex multi package repository structure.
packages/
  checkout_feature/
  profile_feature/
  shared_ui/
apps/
  main_app/
Real-world example A large company with several genuinely separate teams splits their sprawling Flutter app into distinct internal packages for checkout, profile, and shared UI components, using Melos to properly manage the increased complexity of consistently versioning and testing each of those individual packages together.

Common follow-ups: What is Melos, and how specifically does it help manage a genuinely complex Dart monorepo?;At what specific point does the added structural overhead of separate packages genuinely become worthwhile compared to simply using folders alone?

Flutter Plugin & Package Development;Publishing Packages on pub.dev
All 7 Flutter App Architecture with Modular Feature Folders questions