Addressing a crowd of 400 people might be a daunting task to some. But Sabrina Farmer, who spoke to such a group inside the Boeing Freedom Pavilion at the National WWII Museum, is used to performing under pressure. As vice president of engineering at Google, Farmer is one of the company’s few employees who has worked on every single one of Google’s products, which means she makes decisions that impact billions of people and make billions of dollars.