Demir began playing college basketball as early as age 16 during the 2011-12 season for the İTÜ B.K. at Istanbul Technical University. He played 13 games and averaged 2.4 points, 1.5 rebounds and 0.1 assists.[1]
Professional career
Demir joined the Turkish Basketball League while still in his teens and played for the Anadolu Efes during the 2011-12 season. In his only game played with the team, Demir averaged 6.0 points, 8.0 rebounds and 1.0 blocks.[1]
He returned to İTÜ B.K. in 2012 and played for the team in 106 games until 2016, averaging a combined total of 27.6 points, 17.1 rebounds and 2.3 assists.[1]
In 2016, Demir returned to Anadolu Efes and played until 2018. He played 22 games and averaged a combined total of 2.6 points, 2.0 rebounds and 0.5 rebounds.[1]