How to Build a Flutter App from Scratch

From flutter create to both stores - the architecture that doesnt require a rewrite at 10k users.

Flutter's Getting Started tutorial gets you to a running app in 10 minutes. Getting to a production app with proper architecture, state management, and CI/CD takes more intentional setup. This guide covers the decisions you need to make in the first week that affect the next year.

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The First Week Architecture Decisions That Matter

The decisions that are painful to change later: folder structure (feature-based vs type-based) state management approach (BLoC vs Riverpod - pick one and be consistent) navigation library (GoRouter is now the recommended default) and whether to use Flavor or dart-define for environment configuration. Making these decisions in week one means the codebase is consistent throughout. Making them reactively in month three means inconsistency and a refactor sprint.

At Valletta Software, we focus on:

Project structure: feature-based - lib/features/auth/ lib/features/home/ - not lib/screens/ lib/widgets/

State management: Riverpod (flexible compile-time safety) or BLoC (strict event-driven) - pick one

Navigation: GoRouter - nested routes deep linking guard support pub.dev recommended

Environment config: --dart-define or flutter_dotenv - not hardcoded API keys in source

Dependency injection: Riverpod providers or GetIt - no global singletons

Error handling: global error boundary plus per-feature error states - empty states matter too

Logging: logger package with release-mode log suppression - no debugPrint in production

The Testing Strategy for Flutter

Three levels: widget tests integration tests golden tests. Each catches different bugs.

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Unit tests: business logic repositories use cases - pure Dart no Flutter required

Widget tests: individual widgets in isolation - fast no device required

Integration tests: flutter_test with integration_test package - runs on real device or emulator

Golden tests: pixel-level screenshot comparison - catch unexpected UI regressions

Mocking: mocktail or mockito - mock repositories and external services

CI: run unit plus widget tests on every PR integration tests on merge to main

Coverage: flutter test --coverage - aim for 70%+ on business logic less strict on widgets

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How to Build a Flutter App from Scratch - With Engineers Who've Shipped to Both Stores

Our Flutter engineers make the architecture decisions in week one: feature-based structure consistent state management GoRouter and flavor-based environment configuration.

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Our Flutter engineers make the architecture decisions in week one: feature-based structure, consistent state management, GoRouter, and flavor-based environment configuration.

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