As a songwriter, Fontaine made a major splash in 2017 via “Bodak Yellow,” Cardi B’s breakthrough number one hit single. Success behind the scenes continued with G-Eazy’s number five hit “No Limit” and Rita Ora’s “Girls,” both of which featured Cardi, and Kanye West’s Ye, containing five songs Fontaine had a hand in writing. In September 2018, Fontaine took a step forward as a headliner with “Backin’ It Up,” released on major-label Atlantic. The rowdy single, yet another Cardi collaboration, reached number 40 on the Billboard Hot 100. In 2019, he issued solo singles including “Madden Flow,” “Rodman,” and “Shea Butter,” as well as “Peach” featuring Yung Miami of the City Girls.