Birsen grew up with the Fenerbahçe Ülker juniors team and he made his debut with Fenerbahçe during the 2011–12 season. On 26 August 2014, he was loaned for a season to Olin Edirne, later renamed as Eskişehir Basket.[2][3] Then Olin Edirne relocated to Eskişehir as Eskişehir Basket. Over 23 Turkish League games played in the 2014–15 season, he averaged 3.1 points and 1.9 rebounds per game.
On 12 June 2018, Birsen was announced by Anadolu Efes, where he signed a 2-year contract.[4]
On June 29, 2021, Birsen signed a three-year (2+1) deal with Fenerbahçe of the Turkish Super League and the EuroLeague, returning to the club after six seasons.[6] On May 30, 2023, he renewed his contract through 2026.
Turkish national team
He has been member of the Turkish Under-16 and Under-18 national team.[7] He won the bronze medal at the 2010 European U-16 Championship.