Koloamatangi was signed by the Detroit Lions as an undrafted free agent on May 12, 2017.[2] He was waived on September 2, 2017 and was signed to the practice squad the next day.[3][4] He signed a reserve/future contract on January 1, 2018.[5]
On September 2, 2018, Koloamatangi was waived by the Lions and re-signed to the practice squad.[6][7] He was promoted to the active roster on December 11, 2018.[8]
On August 31, 2019, Koloamatangi was waived by the Lions.[9]
New York Jets
On October 30, 2019, was signed to the New York Jets practice squad.[10] He was promoted to the active roster on November 16, 2019.[11]
Koloamatangi re-signed with the Jets on April 23, 2020.[12] On July 28, 2020, he opted out of the 2020 season due to the COVID-19 pandemic.[13] He was waived after the season on May 7, 2021.[14]