All 7 Flutter App Architecture with Modular Feature Folders questions
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What does organizing a Flutter project using a feature based folder structure actually mean, and how does it differ from the more common default approach of organizing files strictly by their specific type? 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 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? 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 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?

Intermediate

Answer

When every single feature's related code is properly self contained within its own dedicated folder, two entirely separate developers working simultaneously on two genuinely different features are considerably less likely to end up editing exactly the same shared file at precisely the same time, which meaningfully reduces the frequency and overall severity of disruptive merge conflicts compared to a codebase organized strictly by file type, where several unrelated features might otherwise all need to modify the exact same shared file, such as one single enormous routes file, purely because that file happens to be structurally organized by type rather than genuinely by feature.
// Modular structure avoids many developers editing one shared routes.dart file
lib/features/checkout/checkout_routes.dart
lib/features/profile/profile_routes.dart
Real-world example A team of eight developers working on separate features each define their own dedicated feature specific routes file rather than all needing to edit one single, shared, monolithic routes file together, significantly reducing the number of disruptive merge conflicts they experience during a typical busy working week.

Common follow-ups: How do these individual separate feature specific route definitions eventually get properly combined together into the app's one overall single router?;What other specific benefits does this same modular approach provide beyond simply reducing merge conflicts?

Navigation & Routing in Flutter;CI/CD Pipelines for Flutter Apps
All 7 Flutter App Architecture with Modular Feature Folders questions