Kwiatkowski was born in Grudziądz. Considered one of Poland's strongest cyclists, he made headlines on the international scene as an 18-year-old teen, when he claimed the silver medal in the sprint final match against Australia's Ryan Bayley at the 2000 UCI Junior Track World Championships in Fiorenzuola, Italy. An early success from junior cycling tournaments helped Kwiatkowski develop his form from a pure power sprinter into being one of the most successful Polish cyclists of all time. This showed that he had collected numerous medals in men's Keirin, sprint, and team sprint events at the European U-23 Championships and UCI World Cup. Selected as the official member of the Polish cycling team, Kwiatkowski made his debut at the 2004 Summer Olympics in Athens, where he edged out Germany's top favorite Jens Fiedler to take the seventh spot in the men's Keirin, but lost the repechage round one match to Barbados' Barry Forde in the men's sprint. Affiliating with Damian Zieliński and Rafał Furman in the men's team sprint, Kwiatkowski rode a split time of 13.360 on the second leg to deliver the Polish trio a ninth-place finish in 45.093, narrowly missing out in the first round match by eleven-hundredths of a second. Shortly after his first Olympics, Kwiatkowski started the 2005–2006 season at the European Championships, where he helped the Polish squad score a more satisfactory triumph in the men's team sprint. He also added a silver medal to his seasonal career hardware in the final match against Ukraine's Andriy Vynokurov at the first stage of the UCI World Cup series in Moscow, Russia, making him the most successful male rider of the season by the Polish Cycling Federation. Three years later, Kwiatkowski qualified for his second Polish squad, as a 25-year-old, in two track cycling events at the 2008 Summer Olympics in Beijing by receiving a berth from the UCI Track World Rankings. In the men's team sprint, held on the first day of the track program, Kwiatkowski and his teammates Maciej Bielecki and Kamil Kuczyński set a thirteenth-place time of 45.266 and an average speed of 59.647 km/h in an opening heat against Japan, but were relegated for swerving out of the lane on the final stretch, handing their rivals a more satisfactory triumph. Two days later, in the men's sprint, Kwiatkowski could not progress from the early stages after losing out again in the first round to Great Britain'sJason Kenny and the repechage to Malaysia's Azizulhasni Awang. Kwiatkowski died at the age of 36 from leukemia.
