Born in Dourdan, Chatin began his karting career in 2006 at the age of 14. He progressed to the KF2 category by 2008. In 2010, Chatin made his single-seater debut in the F4 Eurocup 1.6 series, finishing fourth in the championship with two wins at Silverstone.
In 2011, Chatin graduated to the Eurocup Formula Renault 2.0 series with Tech 1 Racing. He finished ninth with a win at Le Castellet and another podium at Silverstone. He also competed in Formula Renault 2.0 Alps, collecting three consecutive victories at the Hungaroring and Le Castellet, ultimately finishing third in the championship. For the 2012 season, Chatin remained in the Eurocup with Tech 1, improving to sixth in the championship.
Chatin switched to sports car racing in 2013, joining Team Endurance Challenge in the LMPC category of the European Le Mans Series. He and teammate Gary Hirsch won the series title with three wins at Imola, Spielberg, and the Hungaroring. Chatin was awarded the series' Revelation of the Year. In 2014, Chatin moved to the LMP2 category, joining Signatech Alpine alongside Nelson Panciatici and Oliver Webb. The team won at Spielberg and secured two more podiums, clinching the championship title. They also finished third in LMP2 at the 24 Hours of Le Mans. After the season, Chatin was named the ELMS's LMP2 Driver of the Year.
Remaining with Signatech Alpine, Chatin progressed to the FIA World Endurance Championship in 2015, finishing second at Fuji and winning at Shanghai. He returned to the ELMS in 2016, partnering Timothé Buret and Fabien Barthez. In 2018, Chatin began a full-time partnership with IDEC Sport, leading the outfit to two third-place finishes and maiden pole positions at Le Castellet and Spielberg. He also scored pole in qualifying at Le Mans.
In 2019, reunited with Paul Lafargue, Memo Rojas, and IDEC Sport, Chatin secured a pole position at Barcelona. The team achieved its first win in the ELMS at Silverstone and Chatin won the season finale in Portugal, securing the championship. The 2020 campaign was challenging, with Chatin missing a race after contracting COVID-19. In 2021, Chatin won the 24 Hours of Daytona in class for Era Motorsport. In 2022, Chatin and his teammates at IDEC took three successive top 5 finishes, including a victory at Monza.
Chatin remained in the ELMS for his sixth full season at IDEC Sport in 2023, partnering Lafargue and Laurents Hörr. He led IDEC to fifth in the standings with two LMP2 Pro class podiums and a pole position at Portimão. At the 24 Hours of Le Mans, Chatin took LMP2 pole for the second time. The 2023 season also saw Chatin compete in the IMSA SportsCar Championship for PR1/Mathiasen Motorsports, clinching the LMP2 class title with a runner-up result at Petit Le Mans.
Ahead of the 2024 season, Chatin was announced as a factory driver for Alpine Endurance Team. He was chosen as one of the team's drivers in the Le Mans Hypercar category of the WEC, driving the No. 35 Alpine A424 with Charles Milesi and Ferdinand Habsburg. Their season started with a seventh place in Qatar. Chatin also drove in the IMSA SportsCar Championship with AO Racing during 2024, scoring a best class result of third at Road America.
In 2025, Chatin returned to Alpine's No. 35 WEC lineup. The team scored Alpine's first victory with the A424 at Fuji. Chatin left Alpine following the final round. In November 2025, it was announced that Chatin would join the new Genesis Magma Racing project for the 2026 FIA World Endurance Championship season.
Following his maiden LMP2 season in 2014, Chatin was praised for his "well-judged" overtaking manoeuvres and described as a clean driver. He is also notable for his speed in qualifying, exemplified by multiple ELMS pole positions and two LMP2 class poles at Le Mans (in 2018 and 2023).
During his time in endurance racing, Chatin has named four-time Le Mans 24 Hours winner Henri Pescarolo as his inspiration.
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