Guarnieri was born in Vizzolo Predabissi, Italy.
In September 2014 it was announced that Guarnieri would join Team Katusha from 2015 on a two-year contract, with the team’s general manager Viatcheslav Ekimov emphasising Guarnieri’s role as part of the lead-out train for Alexander Kristoff.
He was named in the start list for the 2015 Tour de France.
In the 2018 Tour de France he rode as a leadout man for Arnaud Démare, where he first assisted his teammate in surviving the high mountains of the 2nd and 3rd weeks and then launched Demare perfectly to claim the victory on stage 18.
In May 2019, he was named in the startlist for the 2019 Giro d’Italia.
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