Former national team head coach Jens Tang Olesen has described Hermann as one of the most talented players in the country.
He began playing for local club Grønlands Seminariums Sportklub before switching to B-67 Nuuk at age thirteen.
[3][1] In the final match of the 2015 under-19 division season, Hermann played a vital role in the offense as the team secured a 2–1 victory over FC Vestsjælland and a third-place finish in the table.
[11] Hermann was selected for the national futsal team for the 2012 Arctic Winter Games in Whitehorse, Yukon.
[12] In August 2021, Greenland head coach Morten Rutkjær named Hermann to the 24-man squad that would train and compete against several Danish clubs in Denmark the following month.
[13] The camp was the first of its kind after the Greenland Football Association began the process of joining CONCACAF.