Full-Stack Developer
3 Weeks
Overview
ConvoCore is a real-time communication platform designed for instant one-to-one and room-based messaging. The application uses Socket.io to establish persistent WebSocket connections, enabling messages, typing indicators, and presence updates to propagate instantly without requiring page refreshes.
The backend follows a socket-driven architecture where users can join conversation rooms and exchange messages through isolated channels. Messages are persisted in MongoDB, allowing conversations to remain available across sessions while Socket.io handles the real-time delivery layer.
The system separates real-time events from persistent data operations, allowing the application to scale more cleanly as the number of concurrent conversations increases.
Key Features
- Instant one-to-one messaging using Socket.io
- Real-time typing indicators
- Online/offline presence tracking
- Conversation and room-based messaging
- Persistent message history with MongoDB
- User authentication and session management
- Real-time message delivery without page refresh
- Automatic conversation history loading
- Responsive chat interface
- Connection and reconnection handling
Challenges & Solutions
Managing Real-Time State
Maintaining synchronized chat state between multiple connected users was one of the primary challenges. The application uses Socket.io events to update conversations immediately when a message, typing event, or presence change occurs. Persistent data is handled separately through the backend API and MongoDB, preventing temporary socket state from becoming the source of truth.
Message Persistence & Synchronization
Real-time messages need to appear instantly while also being reliably stored. The system writes messages to MongoDB while broadcasting the corresponding Socket.io event to connected participants. This provides immediate UI feedback while ensuring the conversation can be reconstructed when users reconnect.
Connection Reliability
Users can temporarily lose network connectivity or refresh their browser while maintaining an active conversation. Socket connection lifecycle events are used to detect disconnects and reconnects, while conversation history is retrieved from the database when the user returns.