As a soloist, Małgorzata Walentynowicz has been touring in Poland, Germany, the Netherlands, Belgium, Austria, and Spain. She appeared with Neofonia Ensemble, The National Warsaw Philharmonic Orchestra, Polish National Radio Symphony Orchestra and other prominent European ensembles. In 2012, Walentynowicz joined Ensemble Garage.
She collaborated with numerous contemporary composers, such as Chaya Czernowin, Pierre Jodlowski, Zygmunt Krauze, Michael Beil, Carola Bauckholt, Clemens Gadenstätter, Caspar Johannes Walter, Tadeusz Wielecki, Krzysztof Wołek, and Jagoda Szmytka. Małgorzata won first prizes at the 37th International Gaudeamus Interpreters Competition (2009) in Amsterdam and Yvar Mikhashoff New Music Trust Competition (2010) in Buffalo, New York.