With Agata Błażowska, he is the 1997 World Junior bronze medalist, a two-time Ondrej Nepela Memorial champion, the 1999 Winter Universiade bronze medalist, and the 1999 Polish national champion.
Ranked third in all segments, they were awarded the bronze medal behind two Russian teams – Nina Ulanova / Michail Stifunin (gold) and Oksana Potdykova / Denis Petukhov (silver) – at the 1997 World Junior Championships in Seoul, South Korea.
After winning gold at the 1997 Ondrej Nepela Memorial, they debuted on the Champions Series (Grand Prix), placing seventh at the 1997 Cup of Russia.
In the 1999–2000 season, Błażowska/Kozubek were awarded gold at the 1999 Ondrej Nepela Memorial and silver at the 1999 Skate Israel.
In October 2001, Błażowska sustained a gluteal muscle injury while warming up before the free dance at the Karl Schäfer Memorial.