From Gualeguaychú, Entre Ríos, he played for Central Entrerriano prior to joining Estudiantes de La Plata aged eleven years-old.
He trained with the Argentina national under-17 football team under Pablo Aimar.
[1] In January 2023, just after he turned seventeen years-old, Atum made his debut in the Estudiantes de La Plata reserve team.
[3] On May 8, 2023, he made his first team debut in the Argentine Primera Division as a substitute in a 2–0 win over Velez Sarsfield.
[4][5][6] His father, Walter Atum, helped him with his dream to play football.