Later Shchetynsky participated in master classes with Edison Denisov and Poul Ruders in Denmark, and summer courses in Poland, where he attended lectures by Louis Andriessen, Witold Lutosławski, Krzysztof Penderecki, Boguslaw Schaeffer, and Magnus Lindberg.

Shchetynsky received seven international composer's awards: At the age of about 30, he developed his personal post-serial style based on combination of quasi-serial procedures and special attention to attractiveness of sound material and to melody as a source of expression.

Moscow critic Alexey Parin referred to Shchetynsky as "a consequent stickler for avant-garde" and stated that "his spirituality reveals in strict, ascetically beautiful sounds that impress with their hermetism, within the context of up-to-date musical language".

The influence of an especially eastern European variety of minimalism (more meditative and less didactic) is also apparent in the carefully worked out relationship between different degrees of sound and silence, the predominance of soft dynamics, and in the smallest details and changes in pitch, timbre and rhythm.

Since 1995, although being a free-lance composer, he regularly lectured on Ukrainian music, gave master classes, and presented own works at international festivals and symposia in Austria, Germany, Macedonia, the Netherlands, Poland, Slovakia, Switzerland, and Ukraine.