In the NCAA, Umoja Gibson played for three teams—North Texas Mean Green, Oklahoma Sooners, and DePaul Blue Demons. In total, he appeared in 161 games at the collegiate level in the United States, averaging 13.2 points, 2.6 rebounds, 2.3 assists, and 1.4 steals per game in 30.6 minutes on the court.

After his NCAA career, he moved to Germany, where he played for Goettingen. He appeared in 32 games in the German national championship, averaging 14.4 points, 4.9 assists, 2.3 rebounds, and 1.5 steals per game in 27.1 minutes on the court. In the 2023/24 season, Gibson was his team’s leading scorer and steal leader.

He began the 2024/25 season in China before moving to Subotica to join Spartak in late October 2024. He played in 26 ABA League games, averaging 17.8 minutes, 9.0 points, 3.0 assists, and 2.0 rebounds per game.

His best performance in the regional league came in the 18th round when he scored 31 points against Krka in Subotica, adding four assists, which earned him a valuation index of 34 and the ABA League Player of the Round award. He faced Cedevita Olimpija twice in the 2024/25 season—scoring nine points in the 11th round in Tivoli and recording 13 points in the 26th round in Subotica.