Bartsch played for youth club 18.3 Massive FC and won the U.S. Virgin Islands Soccer Association's Under-15 Boys League with the team in 2018.

[5] Following the resumption of college soccer during the COVID-19 pandemic, he became a member of the school's NCAA Division III squad.

[8] Bartsch was named as part of the 23-man USVI roster ahead of a training camp in Florida in March 2021.

[9] He made his senior international debut for the territory on March 21 in a friendly against Anguilla which was part of the camp.

[10] Six days later he made his competitive debut in a 3–0 defeat to Antigua and Barbuda in the team's first match of 2022 FIFA World Cup qualification.