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 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 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 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?

Intermediate

Answer

Shared code that is genuinely used across several different features, such as common reusable widgets, generic utility functions, or core infrastructure services like a shared networking client, is typically organized within a separate dedicated top level folder, often named something like core or shared, kept clearly and deliberately distinct from the individual feature specific folders, and establishing a clear team wide convention distinguishing exactly what genuinely belongs in this shared location versus what should instead remain properly scoped within one single specific feature folder helps meaningfully prevent that shared folder from gradually and messily accumulating an excessive, disorganized amount of only loosely related, poorly justified code over time.
lib/
  core/
    widgets/
    services/
    utils/
  features/
    checkout/
    profile/
Real-world example A team establishes a clear convention that a specific widget only genuinely moves into the shared core folder once it is actually being reused by at least two entirely separate features, preventing that shared folder from prematurely accumulating a large number of widgets that are actually only ever used by one single specific feature.

Common follow-ups: What criteria should determine whether a specific piece of code truly belongs in a shared folder versus within a single feature?;How do you handle a widget that starts out specific to one feature but later genuinely needs to be reused elsewhere?

Custom Widgets & Reusable Components;Flutter Architecture Patterns (MVVM & Clean Architecture)
All 7 Flutter App Architecture with Modular Feature Folders questions