As a child he learned violin and choral singing, later he was a member of the cabaret group Andritzer Treffpünkte and worked independently in the telecommunications industry in field service.

[2] At the Reichenau Festival he appeared in Fräulein Else in 2011 and in Stefan Zweig's Ungeduld des Herzens in 2012, and from 2011 on he worked at the Vorarlberg State Theatre, starring in Tartuffe, Die verzauberten Brüder, Mutter Courage and Ronja Räubertochter.

In 2015 he worked at the Bosnian National Theatre Zenica in Balkan Requiem, and was also seen at the Vienna Lustspielhaus as Hamlet directed by Adi Hirschal, and played with the Aktionstheater Ensemble in Angry Joung Men and Kein Stück über Syrien.

In 2017 he appeared in the ORF/ARD television film Dennstein & Schwarz - Sterben macht Erben and the ORF TV series Walking on Sunshine.

Finster then played Crimson Commander David Vossin in Netflix's Tribes of Europa in2021 [6]