Kaźmierczak was born in
Łęczyca. After entering
ŁKS Łódź's youth ranks at the age of eight, and spending the following decade there, he started his professional career in 2000 with
Piotrcovia Piotrków Trybunalski, playing three seasons with the club. In 2003 Kaźmierczak moved to
Pogoń Szczecin, establishing himself as an
Ekstraklasa player. He then served a loan in
Portugal with
Boavista F.C. during the
2006–07 campaign, where he scored five
Primeira Liga goals and played alongside compatriot
Rafał Grzelak. After solid overall displays, Boavista neighbours
FC Porto paid Pogoń around
€1.4 million to acquire Kaźmierczak's services. He helped the northerners
retain their domestic supremacy, but appeared sparingly (11 league games, plus 65 minutes in a 1–4 loss at
Liverpool for
the group stage of the
UEFA Champions League). Kaźmierczak's disappointing first year at Porto saw him linked with a move away from the club and, on 21 July 2008, he joined English
Football League Championship side
Derby County on a season-long loan, with a view to a
£1.3m permanent deal. After coming on as a
substitute he scored his first goal for his new team with a clinical finish against
Norwich City, in a 3–1 win. However, Kaźmierczak fell out of favour under new Derby manager
Nigel Clough, and finished the season with 22 league appearances, scoring twice. He later revealed his frustration at being left out of the team, accusing the coach of "not liking foreign [players]", and that "I have made up my mind – I want to leave. It is all over. I am leaving Derby County". Clough responded to the player's accusations, saying "Is that what he said, is it? I have got no problems with foreign players at all. If they have got the right character and they want to fight tooth and nail for Derby County, we will have players whether they are Chinese, American, Spanish – anyone to help us get three points." On 14 July 2009 Porto arranged for another loan deal for Kaźmierczak, who joined
Vitória de Setúbal on a
season-long move. The following year he was released and returned to his country, signing for
Śląsk Wrocław. ==International career==