Architecting Flutter Applications

Contents

• Core Architectural Principles
• Structuring the Layers
• Implementing the Data Layer
• Feature Implementation Workflow
• Examples

Core Architectural Principles

Design Flutter applications to scale by strictly adhering to the following principles:

• Enforce Separation of Concerns: Decouple UI rendering from business logic and data fetching. Organize the codebase into distinct layers (UI, Logic, Data) and further separate by feature within those layers.
• Maintain a Single Source of Truth (SSOT): Centralize application state and data in the Data layer. Ensure the SSOT is the only component authorized to mutate its respective data.
• Implement Unidirectional Data Flow (UDF): Flow state downwards from the Data layer to the UI layer. Flow events upwards from the UI layer to the Data layer.
• Treat UI as a Function of State: Drive the UI entirely via immutable state objects. Rebuild widgets reactively when the underlying state changes.

Structuring the Layers