In 2015, Mulhauser competed full-time in the Moto2 World Championship for Technomag Racing Interwetten. He scored his first World Championship point at the Indianapolis Grand Prix, finishing 15th, and placed 28th in the overall standings. He extended his contract for another season and raced in the Moto2 World Championship for CarXpert Interwetten. He finished 30th overall with four points, with his best result being 13th place at the German Grand Prix.
At the 2016 Grand Prix of the Americas in Austin, Mulhauser was involved in a collision with Luca Marini while running between 27th and 18th position, which resulted in his retirement from the race.
Mulhauser has scored points three times in 52 Grand Prix starts, including two in the current season (15th in Spain and 13th in Germany).
FIM Endurance World Championship—Moto Ain (2017–2021)
In 2017, Mulhauser joined the French team Moto Ain to compete in the Superstock category of the FIM Endurance World Championship. He finished second in class at the 24 Heures Motos alongside Alexis Masbou and Hugo Clère. Later that season, he also competed in the Bol d'Or with Team Bolliger Switzerland.
Mulhauser competed with the Moto Ain CRT team in the Superstock category of the FIM Endurance World Championship. At the 8 Hours of Oschersleben, he and teammates Roberto Rolfo and Stefan Hill finished fourth overall and first in the Superstock class. Moto Ain won the FIM Endurance World Cup on a tiebreaker against GERT56 by GS Yuasa based on the best individual race result.
During the 2019–20 FIM Endurance World Cup Superstock season, Mulhauser competed with Moto Ain alongside Roberto Rolfo and Hugo Clère. The team secured the Superstock World Cup title at the 12 Hours of Estoril in Portugal, the final race of the season. Moto Ain entered the event with a 26-point lead over GERT56 by GS Yuasa.
Moto Ain moved from the Superstock category to the top class of the FIM Endurance World Championship. The team included Randy de Puniet as one of Mulhauser's teammates. At the 2021 12 Hours of Estoril, Mulhauser and the team finished fifth overall.
At the 2021 Bol d'Or, the team finished second in the Endurance World Championship category. Mulhauser left Moto Ain after the 2021 season.
Official reserve rider—Yamalube YART Yamaha (2022–2025)
In February 2022, Mulhauser joined the YART as a fourth rider in the FIM Endurance World Championship alongside Niccolò Canepa, Karel Hanika, and Marvin Fritz. During pre‑season testing for the 2022 Endurance World Championship at the 24 Hours of Le Mans, the YART Yamaha team recorded the fastest times in all four sessions and completed 264 laps over two days at the 4.185‑kilometer Circuit Bugatti.
In the 2023 FIM Endurance World Championship, the Yamalube YART Yamaha team won the title after finishing fourth at the Bol d'Or, securing its first championship since 2009. Earlier in the season, the team finished second at the 24 Heures Motos in Le Mans and won the 24 Hours of Spa‑Francorchamps. YART entered the Bol d'Or 13 points behind championship leader F.C.C. TSR Honda France. Honda later retired from the race because of a mechanical issue, and YART's fourth-place finish secured the championship.
In the 2025 FIM Endurance World Championship, the Yamalube YART Yamaha team won the title after finishing second at the Bol d'Or, securing the championship by a single point. The team completed 725 laps in the race, giving it a narrow margin over its closest rival. Going into the final round in France, YART held a small lead over the BMW Motorrad World Endurance Team. The 2025 title was the team's third FIM Endurance World Championship victory, after 2009 and 2023.
Mulhauser was also entered in the 2025 Suzuka 8 Hours with Team BabyFace Titanium Power, alongside Japanese riders Kazuma Tsuda and Keisuke Maeda.
Season 2026—3ART Best of Bike (Superstock)
In 2026, Mulhauser competed in the Superstock category at the 24 Hours of Le Mans for 3ART Best of Bike Hamaguchi on Yamaha #36, alongside Loïc Arbel, Jan Mohr, and Luca De Vleeschauwer.
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