He then started his professional career with LASK Linz Juniors playing in the Austrian Regional League.

[3] In June 2019, Piesinger signed a two-year contract with Danish Superliga club Randers FC.

Moreover, the club claimed victory in the Danish Cup after defeating SønderjyskE 4–0 in the final at Ceres Park in Aarhus, with Piesinger contributing with a goal.

Piesinger started his career as a defensive midfielder, and during his time at Sturm Graz he was described someone with his strengths being his ability to pass the ball with precision, his tireless work ethic, and his leadership qualities.

[2] After joining Randers in 2019, he was increasingly utilised as a centre-back under head coach Thomas Thomasberg in a four-man defense next to Erik Marxen.