After leaving college, Post moved from Dallas to Los Angeles, California, with long time friend Jason Stokes. He later participated in a music group known as BLKCVRD, which consisted of Billie Gvtes, Jason Stokes, Post Malone and several more artists. He also met 1st and Rich of FKi Music, who helped him produce "White Iverson" and other songs. Post recorded the song two days after he wrote it.
He thought of the name after getting braids in his hair, thinking he looked like a "White Iverson", a reference to the professional basketball player, Allen Iverson. Upon completion in February 2015, it was uploaded to Post's SoundCloud account. Post Malone released the video for "White Iverson" on July 19, 2015, which has received over 163 million views since its initial release. After the initial hype of "White Iverson", Post released several other popular singles to his SoundCloud including "Too Young", "What's Up", and "Tear$" which all saw a similar level of popularity to the breakout hit. This group of songs quickly brought him attention from record labels, gaining over a million plays the month it was uploaded. In August 2015, he decided to sign with Republic Records. Since his breakthrough hit, Post has been working with a number of big name rappers such as 50 Cent, Young Thug, and having a song, "Fade", featuring himself play during Kanye West's fashion show Yeezy Season 3, which also featured Ty Dolla Sign and "The Queen Of House" Barbara Tucker . Malone's new friendship with Justin Bieber has given him the opportunity to tour with Bieber in his "Justin Bieber: Purpose World Tour."
On April 20, 2016 he premiered his new single "Go Flex" on Zane Lowe's Beats 1 show. On May 12, 2016, he released a mixtape titled August 26th.