[3] After two years of competition and three race victories in the series, Schiller graduated to the FIA Formula 3 European Championship, signing with Team West-Tec for the 2015 season.

[6] Schiller found much success over the course of the season, winning both the individual AM class championship and the Endurance Trophy alongside co-driver Markus Palttala.

At the end of 2016, Schiller announced that he'd be competing for Race Performance in the LMP2 class of the Asian Le Mans Series.

[10] Two years later, Schiller made his debut in the IMSA SportsCar Championship at the 2019 24 Hours of Daytona, driving for P1 Motorsports.

Later that year, Schiller joined Valentin Pierburg in Team Germany's entry into the GT Relay competition at the 2022 FIA Motorsport Games.

He joined co-drivers Luca Stolz and Maro Engel behind the wheel of GetSpeed Performance's sole Pro entry.