I need help developing my web application, the front-end is Ember.js and backend is Firebase/Typescript.

I'm looking for someone proficient in English, and who has extensive experience with Ember.js, as well as Firebase Cloud Functions. 

This is not an easy or typical project, it involves using the ffpmeg library to concatenate mp3s on the back-end, and play music on the front-end. I will assign you one task, and if you complete it well, I'll assign ongoing projects.