Sarah Zeng

Sarah Zeng is an accomplished professional with extensive experience in business operations and investment. Currently serving as Chief of Staff at Braintrust since July 2025, Zeng is also an angel investor with a focus on technology startups including Cartesia AI, Crosby Legal, Etched, and Numeral. Zeng holds the position of SF Lead at Sapienne, where leadership of a mentorship series and programming for women in AI is a key responsibility. Previous roles include Business Operations Lead at Character.AI and Investor at TCV, specializing in infrastructure software. Zeng earned a Bachelor's degree in Applied Mathematics and Economics from Harvard University, where involvement in various organizations and activities was notable.