Since 1981 he has pursued an active career as a pianist playing recitals in Russia,Ukraine,Lithuania,Finland, Norway,Italia,Australia,Great Britain, Germany and also participating in chamber ensembles. He has played with Russian orchestras including the Moscow Philharmonic Orchestra under Dmitrij Kitaenko, Moscow Radio Orchestra under Fuat Mansurov, the Orchestra of the Moscow Conservatory under Leonid Nikolaev, Tromsoe Symphony Orchestra under Kjell Seim, Kristiansand Symphony Orchestra under M. Tilkin, Jonkopping Symphony Orchestra under J.Stigmer and others. He has made frequent appearances in the most prestigious Russian concert halls - the Grand Hall of the Moscow Conservatory and The International House of Music. Sergej Osadchuk has made recordings on the Moscow Radio including Concerto II by List (1976), Concerto by Pirumov etc. At the same time he has had a piano teacher position at the Music College of the Moscow Conservatory.
Since 1992 he has been employed as a piano teacher (professor since 2006) at the North Norway Conservatory in Tromsoe, Norway. He has had master classes in Great Britain, Sweden, Finland, Germany, Norway, Russia. His CD recordings (together with M.Carlsen,M.B.Kjelland and others) have already received praise by many critics.
Sergej Osadchuk has been widely acclaimed for his extensive concertizing both in Norway and abroad.