Detroit/San Francisco — Lei Xu and Justin Song once worked at electric car maker Tesla, one of the hottest companies in Silicon Valley. But with interest and investments in autonomous vehicles mounting, they left to pursue what they saw as the next big thing. Their company, Nullmax, is one of more than 240 start-ups worldwide, including 75 in Silicon Valley, attempting to design software, hardware components and systems for future self-driving cars, according to a Reuters analysis. Xu and Song are bankrolled by corporate money, but unlike many of their fellow entrepreneurs, they skipped funding from Silicon Valley venture capitalists. Founded in August 2016, Nullmax got $10m from a Chinese firm, Xinmao Science and Technology. By seeking corporate backing in China, the Nullmax founders managed to sidestep an issue facing other start-ups in the sector: while big automotive and technology companies are pouring billions into the autonomous vehicle space, Silicon Valley investors so far ...

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