These 3 friends built a $1 billion used cars business

Carro, a play on the words "car hero," is a Southeast Asian auto marketplace designed to simplify car deals using AI technology.  

Founded in 2015 by college friends Aaron Tan, Aditya Lesmana and Kelvin Chng, the company achieved the coveted $1 billion unicorn status this year, after securing $360 million in funding from big name backers such as SoftBank and Indonesian-based fund EV Growth. 

The deal takes total funding to over half a billion dollars and pits Carro alongside key competitors in an industry worth $50 billion and growing.

But as CEO Tan told CNBC Make It at his Singapore HQ, the journey has been lengthy. The 36-year-old's entrepreneurial story started when he was just 13.

Watch the video above to find out how Aaron Tan and his college friends built a billion-dollar business selling used cars, and what the road ahead has in store.