Playing mixed doubles together with Guilherme Teodoro, they reached the semifinals of the competition, winning the bronze medal.

[8] In September 2023, Giulia participated in the 2023 Pan American Table Tennis Championships, held in Havana, Cuba.

[9][10][11] At the 2023 Pan American Games, held in October and November in Santiago, Chile, Giulia Takahashi participated in the doubles event, along with her sister, where they reached the final, losing 4 sets to 3 and winning the silver medal.

[17] In March 2024, Giulia participated in the Singapore Smash, playing doubles with her sister Bruna, where they were eliminated in the 1st round.

[18] At the 2024 WTT Contender in Rio de Janeiro, she reached the doubles semifinals, with her sister Bruna Takahashi.