After karting Franzoni made his auto racing debut in the Brazilian Formula Future Fiat in 2011. Franzoni won races at Interlagos and Curitiba. A strong end of the season, with four consecutive podium finishes, placed Franzoni fourth in the series standings. In August 2011 Franzoni made his European racing debut at Circuit de Spa-Francorchamps. In the 2011 Formula Abarth season the Brazilian joined Cram Competition with a best finish at of ninth.
In 2012 Franzoni started the season in the Formula 3 Brazil Open. Racing in Class B, for older cars, Franzoni crashed out of the final race. For the regular season Franzoni joined Koiranen Motorsport for the 2012 Formula Renault 2.0 Alps Series. With two fourth places at the Red Bull Ring as his best result, Franzoni ended eleventh in the final standings. For 2013 Franzoni remained at Koiranen for their 2013 Eurocup Formula Renault 2.0 campaign. Struggling midfield Franzoni scored two point finishes. In January 2014 Franzoni raced at Interlagos to compete in the 2014 Formula 3 Brazil Open. With a retirement in the pre-final Franzoni was condemned to start the final race in seventh place. After a strong race Franzoni finished second, behind Felipe Guimarães.
The 2014 regular season marked his debut in the American USF2000 series. At Afterburner Autosport Franzoni won his debut race in the streets of St. Petersburg. Collecting a total of four podium finishes, including his oval racing debut at Lucas Oil Raceway, Franzoni ended fifth in the season standings. The following season Franzoni remained at Afterburner for the first six races of the season. Franzoni won one of the races at NOLA Motorsports Park before moving up into the Pro Mazda Championship, scoring another three top five finishes. Moving back into USF2000 Franzoni joined ArmsUp Motorsports. Franzoni won three races, at Toronto, and two at Laguna Seca. With another eight podium finishes Franzoni secured the third place in the championship.
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