After many years as a successful player in Poland’s youth divisions, Kostrzewski started his professional career for the division 3 team OSSM PZKosz Sopot where he gained experience and played for Gdynia’s junior team as well.

[2] In the 2018–19 season, he won the Polish Basketball Cup with Stal Ostrów Wielkopolski and was named the tournament's Most Valuable Player.

[5] On June 28, 2023, he signed with Anwil Włocławek of the Polish Basketball League (PLK).

[6] On August 6, 2024, he signed with Wilki Morskie Szczecin of the Polish Basketball League (PLK) for a second stint.

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