Brian Feinstein is a venture capital investor at Bessemer Venture Partners who has spent over a decade exclusively focused on vertical software—SaaS platforms built for specific industries like construction, legal, and real estate—and is recognized as one of the key architects of Bessemer's vertical SaaS investment strategy. He developed the layer cake model for vertical software economics, which stacks multiple revenue lines like software, payments, and marketplaces within a single industry platform, and served as a long-term board partner to Procore during its unconventional 20-year journey to IPO. Brian Feinstein is a venture capital investor at Bessemer Venture Partners who has spent over a decade exclusively focused on vertical software—SaaS platforms built for specific industries like construction, legal, and real estate—and is recognized as one of the key architects of Bessemer's vertical SaaS investment strategy. He developed the layer cake model for vertical software economics, which stacks multiple revenue lines like software, payments, and marketplaces within a single industry platform, and served as a long-term board partner to Procore during its unconventional 20-year journey to IPO.