Whimsical

Whimsical is a so called single-page web app (SPA). Most of the logic is implemented in the client-side application (“app”) that runs in the browser and syncs updates to the backend (“cloud”) via RPC-style HTTP requests. “Cloud” notifies “app” about updates made by other users via WebSocket.All of the application’s data are stored in a PostgreSQL database. This gives us the comfort of ACID properties, while leaving a lot of room to scale, especially now that AWS provides a PostgresSQL-compatible Aurora variant.