Lagergren started playing the piano as a child. During that period, he won a contest to perform alongside Norwegian pianists Håvard Gimse and Leif Ove Andsnes. As he grew tired of classical piano, Lagergren began mixing on his computer. He holds a bachelors degree in Music Technology from the Norwegian University of Science and Technology.
After the release of Marlon Roudette's "When the Beat Drops Out" in July 2014 Matoma was engaged by Universal Germany to make a remix of it. "Marlon Roudette - When The Beat Drops Out (Matoma Tropical Remix)" was released in August, 2014.
His remix of "Old Thing Back" by The Notorious B.I.G. became popular when it charted in Norway peaking at number two on VG-lista, the official Norwegian singles chart. It also charted highly in Sweden, Finland, Denmark and New Zealand. It reached number 1 on the music blog aggregator Hype Machine with many record companies including Big Beat Records expressing interest in Matoma's work after hearing the remix. Ja Rule, who is featured on the original track, also tweeted that he loved the track. He also remixed the song "Bailando" at the request of Enrique Iglesias' team.
After musician Hedegaard released his Single "Happy Home", he and Matoma had a consultation about a remix of it. This was officially released by Copenhagen Records in September 2014. In October Matoma's Remix of "Eminem's Business" got released.. During this month Warner Music Norway published another remix - "Marit Larsen - I Don't Want To Talk About It (Nelsaan & Matoma Remix)".. It is the 2nd remix, Nelsaan and Matoma produced.