Gómez de Liaño played for the University of the Philippines Fighting Maroons of the UAAP during his collegiate career.
Gómez de Liaño and his younger brother Juan both attended Ateneo's grade school.
[5] When he was 14 years old, Javi was noticed by UPIS head coach Allan Gregorio as a shy 6'1" kid with no experience, but lots of potential.
He also put up a career-high 37 points on a 17-of-25 clip from the field, in addition to 11 rebounds, four assists and two blocks in his final game with the Junior Maroons.
[12] In the second round, against the Adamson Falcons, he put up 13 points (including a clutch three-pointer) on perfect 5-of-5 shooting, six rebounds, and two steals as UP won its second straight game.
[21] Against FEU, Gómez de Liaño recorded 15 points, three rebounds, and a block in 24 minutes in the win.
Against the Green Archers, he had 19 points on 7-of-11 shooting while providing key three pointers that allowed UP to pull away from DLSU and claim the third seed in the Final Four.
[28] The improved conditioning showed in UP's Season 82 debut, as he had a team and college career-high 22 points on an efficient 10-of-16 shooting clip to go along with six rebounds and three steals in a win over FEU.
[34] He finished the season as one of UP's leading scorers, averaging 10.5 points per game on 47.11% shooting from the field, and 35-percent from downtown.
[40] He scored 27 points to go with five rebounds in a win over the AMA Online Education Titans during that year's PBA D-League Foundation Cup.
[43] In 2019, it was announced that both Javi and Juan Gómez de Liaño joined the Mighty Sports team for the 31st Dubai International Basketball Tournament.
[45] On July 5, 2021, Gómez de Liaño signed with the Ibaraki Robots of the Japanese B.League on a one-year contract under the "Asian Quota" rule.
[2] Two days later, he, along with guard Brian Enriquez, was then traded to the Terrafirma Dyip for the 2nd overall pick Jeremiah Gray.
There, he would get to play with his former UP assistant coach Alex Cabagnot and former Gilas teammate Isaac Go while helping Terrafirma develop a winning culture.
[54] In the 2022–23 Commissioner's Cup, he contributed 11 points and six rebounds as he stepped up for the injured Andreas Cahilig in a loss to the Meralco Bolts.
[57] Gómez de Liaño helped Terrafirma get its first win of the season with 17 points in 31 minutes off the bench against the Blackwater Bossing.
[61] He and his rookie teammate Stephen Holt got to play against each other in the Greats vs. Stalwarts game during the 2024 All-Star Weekend.
[62] In a 2024 Philippine Cup upset win over Ginebra, Gómez de Liaño scored 22 points to go with his six rebounds.
[68] On June 7, 2024, Gómez de Liaño announced that he would be leaving the PBA and Terrafirma to play for the Anyang Jung Kwan Jang Red Boosters in the Korean Basketball League.
[75][76] He was then cut from the training pool for the 2020 Olympic Qualifying Tournament in Belgrade, Serbia due to a strained quad.
Gómez de Liaño, along with his brother Juan, was a product endorser for Milo,[77] McDonald's Philippines,[78] and Smart Communications.