Building a Reusable Chat Infrastructure with DynamoDB Single Table Design

The Problem That Kept Coming Back

Every project eventually needed chat. Customer support, collaboration, real time updates. I built chat for one project, then another, then another. Each time I wrote similar code with slightly different data models. It was wasteful.

I decided to build chat infrastructure once and reuse it everywhere. A single DynamoDB table that could power real time messaging for any application.

The Single Table Design

The entire chat system lives in one DynamoDB table. The key structure is simple.