# Product Requirements Document

## Overview
We need to build a modern task management system with real-time collaboration features.

## Key Features
1. User authentication and authorization
2. Task creation and management
3. Real-time updates via WebSockets
4. File attachments and comments
5. Advanced search and filtering

## Technical Requirements
- Node.js backend with Express
- PostgreSQL database
- Redis for caching
- WebSocket support
- RESTful API design

## Success Criteria
- Support 10,000+ concurrent users
- Sub-100ms API response times
- 99.9% uptime SLA