[1] Macchini won the gold medal on the horizontal bar at the 2013 European Youth Olympic Festival.

[3] He then competed at the 2017 European Championships and fell off his signature apparatus, the horizontal bar, twice and did not advance to any finals.

[17] He won the silver medal on the horizontal bar at the 2021 Varna World Challenge Cup behind Tin Srbić.

[22] He was selected to compete at the 2022 World Championships in Liverpool alongside Yumin Abbadini, Nicola Bartolini, Lorenzo Minh Casali, and Matteo Levantesi.

[27] At the Koper World Challenge Cup, he won the bronze medal behind Tang Chia-hung and Tin Srbić.

[28] He was selected to compete at the 2024 Summer Olympics alongside Yumin Abbadini, Nicola Bartolini, Lorenzo Minh Casali, and Mario Macchiati.