[1] In 2009, he joined the youth ranks of Spanish powerhouse FC Barcelona, before transferring to Joventut Badalona two years later.

In the 2015–16 season, Bieshaar made his debut in senior basketball, when spending time on loan with Spanish LEB Oro side C.B.

In the course of the 2016-17 campaign, he debuted for Joventut Badalona in Spain's elite league Liga ACB, while seeing considerable minutes for C.B.

[4] On August 2, 2024, Bieshaar signed with the Kaohsiung Aquas of the Taiwan Professional Basketball League (TPBL).

[7] On 7 November 2017, Bieshaard was selected by coach Toon van Helfteren for the senior Netherlands national basketball team for the first time.