We created GraphQL subscription server with MongoDB as a database for Real-Time Notifications in a Social Media Application. The requirement was to provide users with real-time notifications, making the social media experience more dynamic and interactive. Here's where our GraphQL Subscription Server comes into play. It helped the app deliver real-time notifications whenever there are changes to data elements including posts, comments, likes, or messages.

In this case, GraphQL Subscriptions makes it easier to manage real-time updates based on stored database actions (in MongoDB), such as creating a new post, comment, like, or sending a message in this social media app.

This enhances user experience, creating a lively and dynamic social environment where updates are received promptly. Moreover, as GraphQL Subscriptions are efficient and scalable, it can easily manage real-time notifications for a substantial user base, making it perfectly fit for large scale applications.