She graduated in law at the University of Szczecin. She completed an internship at Dr. Detzter Law Firm in Wurzburg, Germany. She worked at the University of Szczecin at the Faculty of Economic Sciences and Management at the Chair of Transport Law as intern and in the following years as a research and didactic employee, under the supervision of Professor Władysław Górski. In 1999, she received a prestigious award granted by the students of the University of Szczecin – the ‘Golden Chalk’.
In December 1997 she obtained the right to practice the profession of legal adviser confirmed by entry on the list of the District Chamber of Legal Advisers in Szczecin. From February 1998 she was a partner in Adversus Law Firm in Szczecin, specializing in civil law, including commercial and bankruptcy law.
In 2009 Katarzyna Nowakowska was entered on the list of solicitors of the Bar Association in Łódź.