On June 10, 2006 in Kędzierzyn-Koźle, Poland, Jackiewicz had a chance to win the International Boxing Council (IBC) welterweight title.
On September 14, 2008 in Kielce, Poland, Jackiewicz won the European Boxing Union (EBU) welterweight belt.
On March 18, 2009 Jackiewicz resigned the EBU belt and started his preparations to the official IBF eliminator against Delvin Rodriguez.
The Pole landed on the canvas early in the sixth round but managed to continue the fight and won via unanimous decision.
Before the championship bout, Jackiewicz defeated an average fighter from Turkey, Turgay Uzun in Strzelce Opolskie, Poland.
The most important challenge of the Pole’s career was a fight for the IBF welterweight title which took place on September 4, 2010 Jackiewicz went to Ljubljana, Slovenia to face the champion, Dejan Zavec.