In 2017, Simon-Chautemps moved to Sauber.[5] which was rebranded to Alfa Romeo in 2019. When Räikkönen joined Alfa Romeo in 2019, Chautemps became his race engineer for the second time.
In 2022, Simon-Chautemps decided to leave the Sauber team and has made his own business called JSC7 Engineering Ltd.