ScannerFlow: Document Capture & Archive Mobile App

Star ⭐ this Repo to support its development!

---

ScannerFlow is a high-fidelity document scanning and digital archiving mobile app built with React Native & Expo. It provides a production-ready, cross-platform solution for iOS and Android, featuring advanced image processing, OCR, and a seamless user experience architected with Feature-Sliced Design.

This repository represents a modern, scalable, and maintainable approach to mobile application development, enforcing FAANG-level engineering standards.

Table of Contents

• Architecture
• Key Features
• Getting Started
• Development Scripts
• Core Principles
• AI Agent Directives
• Contributing
• License

🏛️ Architecture

ScannerFlow strictly adheres to Feature-Sliced Design (FSD), a professional architectural methodology for frontend applications. This structure ensures high cohesion, low coupling, and clear separation of concerns, making the codebase scalable and easy to maintain.

sh src/ ├── app/ # 1. App-level logic (routing, providers, global styles) ├── processes/ # 2. Multi-screen business processes (e.g., user onboarding) ├── pages/ # 3. Full-screen components (e.g., HomePage, ScanPage) │ ├── HomePage/ │ └── ScanPage/ ├── features/ # 4. Business logic features (e.g., DocumentScan, OcrProcessing) │ ├── DocumentScan/ │ └── OcrProcessing/ ├── entities/ # 5. Core business entities (e.g., Document model and UI) │ └── Document/ ├── shared/ # 6. Reusable, non-business logic code (UI kit, libs, API) │ ├── api/ │ ├── config/ │ ├── lib/ │ └── ui/ # Reusable UI components (Button, Card, etc.) └── tsconfig.json

✨ Key Features

• Cross-Platform: Single codebase for both iOS and Android using React Native and Expo.
• High-Fidelity Scanning: Advanced image processing for clear, crisp document captures.
• OCR Integration: On-device or cloud-based Optical Character Recognition to extract text from documents.
• Digital Archiving: Organize, tag, and search scanned documents efficiently.
• Modern Stack: Built with TypeScript, ensuring type safety and developer productivity.
• Scalable Architecture: Feature-Sliced Design enables parallel development and simplified maintenance.
• High-Performance Tooling: Utilizes Biome for ultra-fast linting/formatting and Vitest for testing.

🚀 Getting Started

Follow these instructions to get the development environment running.

Prerequisites:

• Node.js (LTS version)
• Yarn or NPM
• Expo Go app on your mobile device or an emulator/simulator

Installation:

1. Clone the repository:

   bash git clone https://github.com/chirag127/ScannerFlow-Document-Capture-And-Archive-Mobile-App.git cd ScannerFlow-Document-Capture-And-Archive-Mobile-App

2. Install dependencies:

   bash npm install

3. Run the application:

   bash npx expo start

   Scan the QR code with the Expo Go app on your device, or press a for Android Emulator or i for iOS Simulator.

🛠️ Development Scripts

Script	Description
npm start	Starts the Metro bundler for development.
npm run android	Runs the app on a connected Android device/emulator.
npm run ios	Runs the app on the iOS simulator.
npm run web	Runs the app in a web browser.
npm test	Executes tests using Vitest.
npm run lint	Lints the codebase with Biome.
npm run format	Formats the codebase with Biome.

🏗️ Core Principles

• SOLID: Adherence to the five fundamental principles of object-oriented design.
• DRY (Don't Repeat Yourself): Reusable code is abstracted into the shared layer.
• YAGNI (You Ain't Gonna Need It): Features are implemented only when necessary to avoid bloat.

🤖 AI Agent Directives

SYSTEM: APEX TECHNICAL AUTHORITY (DECEMBER 2025 EDITION)

1. IDENTITY & PRIME DIRECTIVE

Role: You are a Senior Principal Software Architect and Master Technical Copywriter with 40+ years of elite industry experience. You operate with absolute precision, enforcing FAANG-level standards. Context: Current Date is December 2025. You are building for the 2026 standard. Output Standard: Deliver EXECUTION-ONLY results. No plans, no "reporting"—only executed code, updated docs, and applied fixes. Philosophy: "Zero-Defect, High-Velocity, Future-Proof."

2. CONTEXT-AWARE APEX TECH STACKS (LATE 2025 STANDARDS)

This repository, ScannerFlow-Document-Capture-And-Archive-Mobile-App, is a TypeScript-based mobile application. Apply the corresponding Apex Toolchain.

• PRIMARY SCENARIO: MOBILE APP (TypeScript / React Native)

  • Stack: This project leverages React Native (with the Expo framework), TypeScript 6.x (Strict Mode), Zustand (for simple, scalable state management), and TanStack Query (for robust server-state management and data fetching).
  • Architecture: Strictly adheres to Feature-Sliced Design (FSD), enforcing a clear hierarchy from shared libraries up to app-level composition. This modularizes features like DocumentScan and OcrProcessing for maximum scalability and maintainability.
  • Tooling: Biome is mandated for all linting and formatting, ensuring sub-second feedback loops and consistent code style. Vitest is the standard for unit and integration testing. E2E testing should utilize Maestro for its simplicity and reliability in the mobile context.
  • UI/UX: The component library is built within shared/ui, following atomic design principles. All components must be themeable, accessible, and performant.

• VERIFICATION COMMANDS (MANDATORY):

  • Run npm run lint before every commit to ensure code quality.
  • Run npm test to verify that all unit and integration tests are passing.
  • All new features must be developed within their designated FSD slice (features/ or entities/).
  • No business logic is permitted within the pages/ or app/ layers.

🤝 Contributing

Contributions are welcome! Please read the CONTRIBUTING.md file for guidelines on how to submit pull requests.

📜 License

This project is licensed under the Creative Commons Attribution-NonCommercial 4.0 International License - see the LICENSE file for details.