After college, he went unsigned as an undrafted free agent in the 2020 NFL draft.
As a junior, Alexander threw for 2,111 yards and 26 touchdowns on his way to earning Second-team All-Miami Dade County selection, as well as being named 2014 Team MVP for Booker T. Washington Tornadoes.
FIU went on to lose the game 28–3 with Alexander completing 16-of-33 passes for 162 yards being intercepted twice.
[6] At the beginning of his redshirt junior year, Alexander made the switch from quarterback to wide receiver.
Against UMass, Alexander became the first FIU Panther in school history to score a receiving and punt return touchdown in the same game.
He ended the season being named First-team All-Conference USA as a punt returner.
His best performance came at Middle Tennessee catching five passes for 87 yards, scoring his only receiving touchdown of the year.
Wide receivers became eligible for selection between rounds 13–17 and again in the supplemental draft.
Alexander was the penultimate wide receiver selected in the draft proper, picked in round 17, 139th overall.