[1] He won a bronze medal in boys' 10 m air rifle shooting, and also shared a top prize with Egypt's Hadir Mekhimar in the mixed international rifle team at the 2014 Summer Youth Olympics in Nanjing, China.

[2] Péni is also a member of the shooting team at Újpesti Sports Club (Hungarian: Újpesti Torna Egylet) in Budapest under his personal coach József Tóth and Edit Kissné Oroszi.

In his first event, boys' 10 m air rifle, Péni shot a decent score of 183.5 to pick up the bronze medal in the final round, finishing more than twenty-five points behind eventual Youth Olympic champion Yang Haoran.

[2][4] Two days later, Péni and his international partner Hadir Mekhimad of Egypt triumphed the Latin American duo made up of Argentina's Fernanda Russo and Mexico's José Santos Valdés 10–2 for the gold in the mixed rifle team competition.

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