Josa has studied violin and experimental music-theatre at Universität der Künste Berlin and Hochschule für Musik und Darstellende Kunst Frankfurt. He lives and works freelance in Berlin. He is playing for the Andromeda Mega Express Orchestra, the Zafraan Ensemble Berlin, the European Union Chamber Orchestra and in variable chamber music formations. As a musician and performer he participates in music-theatre productions for Schauspiel Zürich, Konzerthaus Berlin, Schauspiel Hannover, Opernfestspiele München, Nationaltheater Mannheim.

For Invisible Playground he creates games focused on the audio-layer.