A feature-rich and scalable chat application developed using Kotlin for the frontend, Firebase for real-time database and authentication, and Ktor for building APIs. The app is deployed on AWS Elastic Beanstalk and utilizes several modern technologies and best practices for optimal performance and scalability.

My chat application offers a variety of features:

• Authentication: Secure login and registration using Firebase Authentication.
• Send Messages: Allows users to send audio, image, and text messages seamlessly.
• Change Profile Picture: Users can easily update their profile pictures.
• View User Information: Users can view the profiles and data of other users, including online status.
• Online/Offline Status: Real-time indication of whether users are online or offline.
• Notifications: Push notifications are sent to users for new messages and other important updates.
• Message Status Indicators:
  • Red Indicator: Shows if the recipient has not seen the message.
  • Green Indicator: Shows if the recipient has seen the message.
• Logout Button: Provides a secure way for users to log out of the application.
• User Search: Functionality to search for other users within the chat app.
• Delete Messages: Users have the option to delete any type of messages from both the database and the user interface.
• Option to View Large Image: Users can view an enlarged version of images.

The following technologies and tools are used in the development of this chat application:

• Kotlin: Used for developing the frontend of the Android application.
• Firebase:
  • Realtime Database: To store and sync chat messages and user data in real-time.
  • Storage: To store images, audio, and other files.
  • Authentication: To handle user sign-up, sign-in, and secure access.
  • Cloud Messaging: To manage and send notifications to users.
• Ktor: A framework for building asynchronous servers and clients in connected systems. Used for API development.
• AWS Elastic Beanstalk: For deploying and managing the backend services.
• Retrofit: A type-safe HTTP client for making API requests.
• OOP (Object-Oriented Programming): Implementing polymorphism to handle multiple types of messages (text, image, audio).
• Dependency Injection: To manage dependencies and improve code scalability and maintainability.
• Coroutines: For managing asynchronous tasks, ensuring a smooth user experience.
• Credential Key Management: For secure authorization and communication between client and server.

• Clean Architecture: Organized codebase for easy maintenance and scalability.
• Dependency Injection: Leveraging libraries like Dagger/Hilt for managing dependencies.
• Coroutines and Asynchronous Programming: For non-blocking UI operations and efficient background processing.
• Security: Proper management of credentials and sensitive data.
• Scalable Codebase: Ensuring the app can handle increasing numbers of users and messages.

Check out the demo of the app on YouTube: Watch Demo

https://play.google.com/store/apps/details?id=com.walid591.chat