Born in Cali, Tunjo began his racing career in karting at the age of five in Colombian championships, collecting titles in various classes.

Tunjo made his début in single-seaters in 2010 at the age of fourteen, taking part in the Formula BMW Pacific series for Meritus.

He finished the season as runner-up to Richard Bradley with one win at the Singapore Grand Prix-support round, while also scoring another four podiums.

[4] He improved to sixth place in the Eurocup standings and had a win at Spa in the NEC series.

[5] But when Signature withdrew from the championship he signed a contract with Pons Racing to compete in Formula Renault 3.5 Series in both 2014 and 2015.