How to build a real-time notification system with Momento: a step-by-step guide

Building a real-time notification system using Momento Topics offers a scalable and cost-effective alternative to traditional WebSocket implementations. Momento Topics abstracts the complexities of managing WebSocket connections and provides an on-demand pricing model that charges based on message usage rather than connection time, making it suitable for applications with infrequent updates. The guide outlines creating a full-stack application with AWS infrastructure, including setting up a cache, generating API keys, and implementing fine-grained authorization to ensure users can only subscribe to their updates. The system uses disposable tokens for secure, short-lived access, and the architecture supports ephemeral environments, allowing for isolated development and testing without additional costs. The backend processes tasks asynchronously via SQS and notifies users upon task completion, while the frontend subscribes to user-specific topics, displaying real-time notifications. This approach ensures secure, robust, and scalable real-time communication suitable for various applications, with no infrastructure management required.