In 2012, Zulli led Shippensburg to an overall record of eleven wins and two losses (11–2) and to the second round of the playoffs. During the season, he led all divisions of college football for the 2012 season with his 54 touchdown passes and 4,747 passing yards. He also tied the NCAA Division II record for touchdown passes in a single season and established new records for both total points scored (344) and total touchdowns (57). In recognition of his season, Zulli was awarded the 2012 Harlon Hill Trophy as the top player in NCAA Division II football. As he won the award as a junior, Zulli became only the seventh underclassman to win the award and the first since Danny Woodhead in 2006.
After the 2014 NFL Draft Zulli received a phone call from the Seattle Seahawks to attend the 2014 rookie mini-camp on a tryout basis. Zulli was cut from the team after displaying an impressive win during the team scrimmage with stats of 12-19 for 132 yards and a touchdown. Although Zulli was cut from the team, he did make a good impression on Super Bowl winning coach Pete Carroll. After Zulli's tryout with the Seattle Seahawks he signed a professional contract with the Montreal Alouettes on June 25, 2014 where he will be starting his professional career on their practice squad. After originally signing with the Harrisburg Stampede, Zulli became a free agent when the Stampede suspended operations on December 30, 2014. He was signed by the Lehigh Valley Steelhawks, also of the Professional Indoor Football League.