In 2007, he joined Piotrcovia Piotrków Trybunalski, where he played twice during the 2007/2008 season.
Jonczyk began his career when he was 9 years old at Piotrcovia Piotrków Trybunalski, but moved to GKS Bełchatów when Piotrcovia youth team disbanded in 2005.
After entering ŁKS Łódź's youth ranks at the age of eight, and spending the following decade there, Kaźmierczak started his professional career in 2000, with lowly Piotrcovia Piotrków Trybunalski, playing at the club three seasons.