The Brief

Humble Angel Records wanted a Playlist Alert app that provides push notifications whenever a track you follow is listed on a Spotify playlist, within hours of the listing taking place.

The Solution

We developed a Native iOS App, built in Swift, that can track over 1 million tracks. It scrapes playlists listed in the Playlist Alert database, and watches the position, appearance, and disappearance of tracks from those playlists. If a change to the items on a playlist is made, then a push notification is sent to any users who follow that track.

There is also an option for in-app purchases for a monthly paid-for subscription option. It is used by music artists and music labels worldwide, with currently over 20,000 playlists tracked live via the app.

More technical details include:

- API built in Django Framework, using the Python language

- Web front-end interface built using Django Templates, HTML5, CSS3, JavaScript

- Heavy use of official Spotify API, and Spotify Login in the app, and of the Postgresql SQL database

- Hosted on Amazon Web Services using the high-availability Elastic Beanstalk deployment technology for scalability and reliability

- Task managementvia Celery

- Caching of data via Redis NoSQL datastore

Available on the App Store