Born in Gdańsk, Pieszczek first had success as a junior in 2007. He made his Polish league debut in 2011 for Wybrzeże Gdańsk, going on to ride for the club in the Ekstraliga in 2012. He won the Bronze Helmet in 2012 and 2013, and in 2013 was also part of the victorious Polish team in the European Junior Championships. In 2015 he moved to Falubaz Zielona Góra.[3]
He rode for GKM Grudziądz in Poland and Lejonen in the Swedish Elitserien in 2017, but after a disappointing season he embarked on an intensive training regime over the winter of 2017/18.[5][6]