Early Career
After starting his career in karting in 2004, Müller advanced to single-seaters in 2008 with his Formula Renault debut. The young Swiss driver finished first in the 2009 Swiss Formula Renault series with Jenzer Motorsport after scoring a podium finish in each of the 12 races.
In 2010, Müller graduated to GP3, continuing his relationship with Jenzer. He took his first victory in the category at the third round of the season in Valencia before finishing third overall behind Robert Wickens and eventual champion Esteban Gutierrez.
In 2014, Müller added the German DTM series to his racing portfolio after securing a drive with Audi Sport Team Rosberg, a series he remained in until 2022. Between 2014 and his entry into Formula E, Müller enjoyed a varied racing career, splitting his time between DTM, Rallycross, GT, and Stock Car racing - experience which would stand him in good stead for life in Formula E’s competitive paddock.
Formula E | 2019-21
Ahead of the 2017/18 season, Müller took up testing and reserve duties for Audi Sport ABT Schaeffler. He made his Formula E debut in the official rookie test in Marrakesh in January 2018. Topping the timesheets during the session, Müller repeated the feat at the same test the following year.
He then graduated to a full-time drive for Dragon’s 2018/19 campaign, joining fellow rookie Brendon Hartley for the team's sixth campaign in the series, competing until the Berlin E-Prix. The following campaign, he completed a half-season with the outfit, scoring a second-place finish in Valencia for his first podium in the championship.
Formula E | 2022-26
After sitting out for the 2021/22 season, the Swiss-born driver rejoined the grid in 2022 with the newly re-entered ABT Cupra team for the start of the GEN3 era.
Unfortunately for Muller, It was a disappointing return to the sport, as the team limped to a last-place finish in the Teams’ standings, spending most of the season outside the points.
The following campaign saw Müller stick with ABT Cupra, joined by new teammate Lucas di Grassi. While the team continued to struggle with both race and qualifying pace for much of the season, Müller came close to a podium finish, missing out in a drag race to the finish line to end with a season-best of fourth.
The speedy Swiss driver ended the year 12th in the Drivers' standings, a career-best to date, coming off the back of a series of points-scoring finishes in the Portland and London double-headers.
Joining Andretti for the GEN3 Evo era, Müller recorded a season-best fourth in both Miami and Jakarta. He narrowly missed the podium in Jakarta after fellow countryman Sébastien Buemi was reinstated to third following an overturned post-race penalty.
For 2025/26, Müller joined the factory Porsche team alongside former champion Pascal Wehrlein. In what proved to be a breakthrough season in the all-electric championship, the Swiss driver claimed his maiden Formula E victory at the Berlin E-Prix, scored a pole position and second-place podium in Miami, and played a crucial role in helping Porsche retain the Manufacturers' World Championship.
Müller finished ninth in the Drivers’ World Championship with 102 points, as teammate Wehrlein claimed championship honours for a second time.
For the GEN4 era, Müller continues alongside Wehrlein at factory giant Porsche.