Entrepreneur Ferdinand Roberts incorporated his new business venture, Asset Class, in January this year. Just five months later, Angel Oak Ventures, the technology venture arm of the Atlanta-based Angel Oak Companies, was ready to invest $3 million in the business, taking a strategic stake. Founded in 2008, Angel Oak Companies has $21.8 billion of assets under management and 750 employees. It has an array of interests from mortgages to private equity. And it now wants Asset Class to help it win new customers in North America and Europe. But how did Roberts attract such a big investor so quickly while…