Stelmakh took up gymnastics at six years old. He is a pupil of Zaporizhzhia children's and Youth Sports School No. 1.
2020
Stelmakh competed at the 2020 European Championships held in Mersin, Turkey. While there he helped the Ukrainian junior team win gold. Individually he also made the pommel horse final, where he took sixth place.[1][2]
2022
Stelmakh competed at the Euro Youth Olympic Festival, where he won the individual All-Around.[3] Additionally he won the bronze in the mixed pair event together with Anna Lashchevska. He also won silver on floor and pommel horse and a bronze medal on parallel bars.
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