Sounds like it was in house: http://www.theverge.com/2015/9/30/9416579/spotify-discover-weekly-online-music-curation-interview http://www.theverge.com/2015/9/30

Sounds like it was in house: http://www.theverge.com/2015/9/30/9416579/spotify-discover-weekly-online-music-curation-interview http://www.theverge.com/2015/9/30/9416579/spotify-discover-w...