Gamboa was drafted by the Los Angeles Dodgers in the ninth round, with the 281st overall selection, of the 2019 Major League Baseball draft.[2] He made his professional debut with the rookie-level Arizona League Dodgers, recording a 2.88 ERA with 33 strikeouts in 12 games. Gamboa did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.[3]
Gamboa returned to action in 2021 with the High-A Great Lakes Loons, logging a 4-5 record and 4.21 ERA with 71 strikeouts across 22 games; he made 30 appearances for the Double-A Tulsa Drillers during the 2022 campaign, posting an 11-4 record and 5.91 ERA with 72 strikeouts.[4] Gamboa split the 2023 season between Tulsa and the Triple-A Oklahoma City Dodgers. In 37 appearances (three starts) for the two affiliates, he accumulated an aggregate 9-4 record and 3.66 ERA with 76 strikeouts and one save across 76+1⁄3 innings pitched.[5]
Gamboa spent the 2024 campaign with the Triple-A Oklahoma City Baseball Club, where he compiled a 3-6 record and 3.30 ERA with 51 strikeouts in 73+2⁄3 innings pitched across 22 appearances (12 starts).[6] He began 2025 with the Triple-A Oklahoma City Comets, posting an 0-2 record and 4.19 ERA with 12 strikeouts over eight games. Gamboa was released by the Dodgers organization on May 13, 2025, in order to pursue an opportunity in South Korea.[7]
Lotte Giants
On May 14, 2025, Gamboa signed with the Lotte Giants of the KBO League as an injury replacement for Charlie Barnes.[8][9] He was named the league's top player for June after going 5-0 with a 1.72 ERA (both league-leading marks), and ranking second in innings pitched (31+1⁄3).[10]
Boston Red Sox
On December 9, 2025, Gamboa signed a minor league contract with the Boston Red Sox.[11]