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Real-time Chat App (Android)

Native Android real-time chat application using Java, Node.js, MySQL, Socket.IO, Firebase Authentication, and Firebase Cloud Messaging.

Real-time Chat App (Android)
Role
Full Stack Developer
Client
Freelance
Type
Mobile / Backend
Platforms
Android, Backend
JavaNode.jsMySQLSocket.IOFirebase AuthFCM

Problem

A client needed a native, reliable real-time chat experience on Android with push notifications and secure authentication.

What I built

A native Android app (Java) backed by a Node.js + MySQL API, real-time messaging over Socket.IO, Firebase Authentication for sign-in, and Firebase Cloud Messaging for push.

Architecture / technical decisions

  • Socket.IO for real-time delivery with fallback handling.
  • Firebase Auth + FCM for authentication and reliable push.
  • REST APIs on Node.js/MySQL for persistence and history.

Result / impact

A delivered, production-ready chat product owned end to end.

Lessons learned

Owning the full stack on a small project sharpens judgement about where complexity is worth it.