Demir is coached by Sadullah Ergün in his hometown.[1]
He won the gold medal in the 10,000 m walk event at the 2022 World U20 Championships in Cali, Colombia.[2]
Demir received the bronze medal in the 20 km race walk event at the 2022 Mediterranean U23 Championships in Oran, Algeria.[3]
He finished the 20 km individual event at the 2023 European Race Walking Team Championships in Poděbrady, Czech Republic on 17th place.
He took the gold medal in the 20 km event with 1:25:38 at the 2023 Balkan Race Walking Championships in Antalya, Turkey.[4]
He competed in the 20 km walkevent at the 2023 European U23 Championships in Espoo, Finland, and was disqualified.[5]
End January 2024, Demir became Turkish champion in the 20 km walk event.[6]
He finished the 20 km walk event at the 2024 European Championships in Rome, Italy with 1:26.33 in the 24th place.[7]
He competed at the Grande Prémio Internacional de Rio Maior em Marcha Atlética Meeting of the Gold Competition Group of the World Athletics Race Walking Tour in Rio Maior, Portugal, and placed fourth in 1:22:11.[8] This result enabled him to qualify for participation in the mixed marathon walk relay event alongside teammate Ayşe Tekdal (born 1999) at the 2024 Summer Olympics in Paris, France.[1][8]
