Pau Cubarsí arrived at La Masia from Girona on 1 July 2018 as a U12 player. The 2023/24 season was a key moment in his career as he made his competitive debut with the first team.

A centre back who provides leadership and decisiveness in defence, while also being able to bring the ball out, as an U18 player during the 2023/24 season, he played for Barça Atlètic, while receiving squad call ups and playing time with the first team. Salamanca will always remain a fond memory for Pau Cubarsí, as the 16-year-old centre back made his competitive debut for the Club in January 2024 against Unionistas in the Copa del Rey. A month earlier he had already featured for the first team in a friendly game in Dallas against Club América.

The centre back played in 24 first team official fixtures in the 2023/24 season as well as playing in the U17 World Cup in the 2023/24 season and making his debut for the full Spanish national side. In the summer of 2024 he claimed a goal medal playing for Spain in the Paris Olympics.