Career
Early career
Zajec started his career with the New York Red Bulls academy when he was 13. After an impressive academy career, Zajec verbally committed to join the Georgetown University Hoyas in 2015. Professional
On March 27, 2015, it was announced that Zajec had signed an "amateur" agreement to play for the New York Red Bulls II of the United Soccer League.
The deal would allow him to play competitive soccer in a professional league without losing his college eligibility.
On March 28, 2015 Zajec made his debut for the Red Bulls II against the Rochester Rhinos. He started and played the whole match as the Red Bulls II drew 0–0.