Kalajdzic begins his first year as a part of Trevor Harmon's staff. He comes from Oklahoma City University where he was a four-year starter for legendary coach Brian Harvey. Kalajdzic was a two-time Sooner Athletic Conference Goalkeeper of the Year and a four-time All-SAC First Team selection for the Stars. He was also a three-year team captain and an eight-time Sooner Athletic Conference Defensive Player of the Week. He helped OCU to the SAC Regular Season Championship in 2014 and set the school record for career saves with 374. He was also a two-time Jim Wade Student-Athlete of the Year. Kalajdzic was also invited to the FC Energy OKC tryouts and was selected to participate in the preseason training camp.
Kalajdzic earned his bachelor's in business administration, accounting from OCU in May 2018. He currently is also an accountant at John B. Davis & Associates in Oklahoma City. He speaks six different languages including; English, Serbian, Croation, Bosnian, Macedonian and Slovenian.
A native of Novi Sad, Serbia, Kalajdzic played six games for the Serbian First League in 2012 and played 10 games for the Second League in 2013.
He currently lives in Oklahoma City and is pursuing an MBA at SNU.