[2] At Columbia, APG, and Atlantic Records, Maddahi has worked as an A&R representative with artists including XXXTentacion,[3] Jennie Kim, Diplo,[4] Koe Wetzel,[5] Jessie Murph,[6] David Guetta,[7] Chromeo,[8] Bilmuri, The Chainsmokers, John Legend,[9] Grimes,[10] Charlie Puth,[11] Demi Lovato,[12] Flo Rida,[13] Clinton Kane,[14] and Cochise.
[15] As a publisher, he has had a role in shaping songs for artists including Kanye West,[16] Chris Brown,[17] Enrique Iglesias,[18] Ariana Grande,[19] Zedd,[20] Black Eyed Peas,[21] and Future.
There, he worked under A&R executive Mike Caren, who soon founded Artist Publishing Group (APG) and hired Maddahi as the company's first employee in August of that year.
[32] In his early years at APG, Maddahi played a role in crafting songs like Enrique Iglesias' "Tonight (I'm Lovin' You)" and Chris Brown's "Yeah 3x.
[34] Later that year, he arranged studio sessions for David Guetta's album Nothing But The Beat, including bringing the Australian vocalist Sia in to record the topline for what later became the hit single "Titanium.
[36] In 2014, Maddahi arranged the studio session between Charlie Puth and the producers DJ Frank E and Andrew Cedar that led to Wiz Khalifa's "See You Again," released as the lead single on the soundtrack to the 2015 film Furious 7.