📱 CheckInCMP

Kotlin Multiplatform • Compose Multiplatform • Android & iOS

CheckInCMP is a modern Kotlin Multiplatform mobile application designed to share business logic and UI across Android and iOS using Compose Multiplatform.

The project follows a clean, layered architecture to keep data, business logic, and presentation separated and maintainable.

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✨ Highlights

• 📱 Android & iOS support
• 🔄 Shared Kotlin Multiplatform code
• 🎨 Compose Multiplatform UI
• 🏗️ Clean layered architecture
• ♻️ Reusable business logic
• 🧩 Data, Domain & Presentation separation
• ⚙️ Gradle-based project configuration
• 🚀 GitHub Actions workflow

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🏗️ Architecture

                    CheckInCMP
                        │
        ┌───────────────┴───────────────┐
        │                               │
     Android                            iOS
        │                               │
        └───────────────┬───────────────┘
                        │
                Compose Multiplatform
                        │
        ┌───────────────┼───────────────┐
        │               │               │
      Data            Domain       Presentation
        │               │               │
        └───────────────┴───────────────┘
                        │
                Shared Kotlin Code

Project Layers

Layer	Responsibility
Presentation	UI and presentation logic
Domain	Business rules and application logic
Data	Data sources and repository implementation
ComposeApp	Shared Compose application code
iOS App	iOS application entry point

The repository structure includes dedicated composeApp, data, domain, and presentation modules.

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🛠️ Tech Stack

Kotlin
Kotlin Multiplatform
Compose Multiplatform
Android
iOS
Gradle
Clean Architecture
GitHub Actions

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📂 Project Structure

CheckInCMP/
│
├── composeApp/          # Shared Compose application
│
├── data/                # Data layer
│
├── domain/              # Business logic
│
├── presentation/        # UI / presentation layer
│
├── iosApp/              # iOS application
│
├── .github/
│   └── workflows/       # CI/CD workflows
│
├── build.gradle.kts
├── settings.gradle.kts
└── README.md

The repository currently uses composeApp for shared Compose code and an iosApp entry point for the iOS application.

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🚀 Getting Started

Clone

git clone https://github.com/Kavinrajan/CheckInCMP.git
cd CheckInCMP

Android

Build the Android application with:

./gradlew :composeApp:assembleDebug

On Windows:

.\gradlew.bat :composeApp:assembleDebug

These are based on the build commands documented in the repository.

iOS

Open the iosApp directory in Xcode and run the application on an iOS simulator or device.

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🎯 What This Project Demonstrates

CheckInCMP demonstrates practical experience with:

• Kotlin Multiplatform development
• Shared Android & iOS code
• Compose Multiplatform
• Layered application architecture
• Cross-platform UI development
• Gradle Kotlin DSL
• GitHub Actions
• Scalable project organization

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🔮 Future Improvements

• Add offline data support
• Add persistent local storage
• Add automated unit tests
• Improve CI/CD pipeline
• Add authentication
• Add API integration
• Add application screenshots
• Add release builds for Android & iOS

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👨‍💻 Author

Kavinrajan S M

Senior Android Developer

Building modern mobile applications with Kotlin, Android, Kotlin Multiplatform, AI/ML and backend technologies.

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