Fintech Chat App

Build a real-time messaging platform for financial advisors and clients with end-to-end encryption, file sharing, and compliance archiving.

React frontend with WebSocket-based real-time messaging, Node.js backend, message queue for reliability, and encrypted storage layer.

• Sub-100ms message delivery with optimistic UI updates
• Message pagination reducing memory usage by 70%
• Connection pooling handling 500+ concurrent users

• WebSocket reconnection logic is harder than the initial connection
• Optimistic UI is essential for chat — users expect instant feedback
• Compliance requirements shape architecture more than features do