Tiangco started out as a contender in
Tawag ng Tanghalan, a competition segment in a noontime variety show ''
It's Showtime'', where he managed to be a two-time defending champion in the first two seasons. Tiangco initially auditioned for the inaugural season of
The Clash, but was rejected until a year later, advancing in the second season, where he was declared a grand champion after performing
Fantasia’s “
I Believe” in the finals. His victory earned him P1 million cash prize, a house and lot, a car, and an exclusive management contract with
GMA Network. Tiangco became a regular performer on the variety show
All-Out Sundays, which began airing in January 2020, where he performed both solo and collaborative numbers with other artists. On April 15, 2023, Tiangco held his first major concert entitled
Dare to Be Different, where he also served as a co-director, in collaboration with Lee Junio Gasid. In 2025, Tiangco made his first acting role in
Mga Batang Riles, but almost a month, he silently departed from GMA Network and its shows to participate in
Tawag ng Tanghalan: All-Star Grand Resbak, as one of the returning contestants from previous seasons. After the competition, a boy band named "4Play" is formed, where Tiangco is one of the members, along with fellow participants, Ian Manibale, Eich Abando, and Mark Justo. Tiangco competed again in the second season of
Tawag ng Tanghalan: Duets, with Eunice Encarnada as his partner under the tandem 'Dugong Bughaw'. ==Personal life==