In a decade-long career as a collaborator, Ostojic has worked with the teaching studios of distinguished professors of music such as Jaime Laredo, Janos Starker, Andreas Poulimenos, Alex Kerr, and Sylvia McNair, to name a few. She is often invited to collaborate with competitors at the Muncie Symphony Orchestra Concerto Competition, Indianapolis Symphony Orchestra Concerto Competition, Carmel Symphony Young Artist Competition, and World Piano Competition (Cincinnati, OH). She has also made appearances as a guest performer and a judge in music festivals and competitions in the U.S. and Europe. During the summer, Ostojic is engaged in the Carmel Klavier International Piano Competition as an organizer as well as the accompanist for its concerto division.
Ostojic currently is appointed at the University of Indianapolis Music Department as Assistant Professor and Director of the Pre-College Program.