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Realtime Communication.tsx
Personal ProjectInfrastructure System

Real-Time Messaging System with Presence & Session Handling

A real-time communication system designed to handle messaging, presence tracking, and connection reliability using WebSocket-based architecture.

Key highlights

  • Real-time messaging with presence synchronization
  • Connection recovery and session consistency handling
  • Room-based architecture for scalable communication

Primary stack

React

Node.js (event-driven WebSocket handling)

Data layer

MongoDB (message persistence)

System Preview

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Problem

Real-time systems require more than simple message delivery — they must handle user presence, connection drops, session recovery, and consistent state synchronization across clients.

Solution

Built a WebSocket-based messaging system that manages real-time communication along with presence tracking, reconnection handling, and persistent message storage. Focused on reliability and state synchronization across multiple users and sessions.

Features

Capabilities & System Features

Security & Auth
Reconnection handling for session recovery
Authentication for secure messaging access
Real-time
Real-time messaging with persistent chat history
User presence tracking (online/offline with sync)
Typing indicators for active conversations
Core
Room-based communication architecture

Engineering challenges

Complex problems solved

01

Reliable Presence & Session Synchronization

Problem

Maintaining accurate user presence across connections is difficult due to disconnections, multiple tabs, and network instability.

Solution

Implemented presence tracking with connection lifecycle handling, ensuring users are marked online/offline correctly and state is synchronized across sessions.

02

Reconnection & Message Consistency

Problem

Users disconnecting and reconnecting can lead to missed messages and inconsistent chat state.

Solution

Designed reconnection handling to restore sessions and ensure message continuity using persisted chat history and room-based re-subscription.

Architecture

System structure

Frontend

React

Backend

Node.js (event-driven WebSocket handling)

Database

MongoDB (message persistence)

Realtime

Socket.io (bidirectional communication)

Technologies

Tooling used

ReactNode.jsMongoDBSocket.io

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