My second conversation with Christina Cacioppo (@christinacaci), Vanta's cofounder and CEO. Charlie Songhurst says the best returns come from companies that are highly boring and highly complex, because fewer founders want to build them. Vanta is one of those companies. When we first talked five years ago, Christina told me about building the first version of Vanta in Excel. Since then she has turned it into the category leader in security compliance. Now she is rebuilding it around…