Which major e-commerce platform was founded by a former quantitative analyst who used mathematical algorithms to create its revolutionary product recommendation system?

The retail industry has seen several companies founded by mathematicians or those with strong mathematical backgrounds. These founders leveraged their analytical skills to revolutionize retail and e-commerce. This poll tests your knowledge about the intersection of mathematics and major retail platforms, where algorithms and equations transformed into billion-dollar enterprises.

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Amazon (Jeff Bezos worked as a quantitative analyst at D.E. Shaw & Co before founding Amazon)
eBay (Pierre Omidyar's background was in computer science, not quantitative finance)
Alibaba (Jack Ma was an English teacher before founding Alibaba)
Shopify (Tobias Lütke was primarily a programmer without a quantitative finance background)