Hassenauer has been a member of the Atlanta Falcons, Birmingham Iron, Pittsburgh Steelers, New York Giants, and Washington Commanders.

By his senior year at East Ridge, Hassenauer's measurements expanded to 6 ft 3 in (1.91 m) and weighed 300 pounds (140 kg).

[5] Hassenauer began his freshman season at Alabama in 2014 on the bench until called to play center against Texas A&M.

Starting his sophomore season as a reserve offensive lineman, Hassenauer joined the Crimson Tide in Game 9 against Texas A&M replacing Ryan Kelly.

During Hassenauer's senior season in 2017, he held reserve positions as guard and center and started in 3 of 8 games he played.

[6] After playing four years at Alabama, Hassenauer was signed by the Atlanta Falcons as an undrafted free agent on April 30, 2018.

[10][11] After the season ended, Hassenauer signed with the Birmingham Iron of the Alliance of American Football, where he played eight games.