A MongoDb Expert needed for creating an API

Hi We have a server which has around 250,000 online audio stations on it. About 40,000 of them are active at any given time. We have already built the scripts and deployed them on the server which collects the metadata(song name, artist etc) from these radio stations and matches them with another database of song metadata. It is database provided by discogs. There is one another database of song metadata provided by musicbrainz , we will be using this metadata to identify songs. The code for this is already available at [login to view URL] but it uses postgre database, you will have to put everything in mongodb which our server uses. And create an api with the following requirements [login to view URL]