Welcome to Ask the CEO , in which chief executives take time out from running companies to solve your career problems.

Thirty-two-year-old Jess Lee is the chief executive and co-founder of Polyvore Inc., a website where users can assemble outfits and mark potential purchases. Before joining the Mountain View, Calif., company in 2008, she was a product manager at Google Inc., working on Google Maps. A self-described introvert who would rather be working behind the scenes than at the center, she landed the top job at Polyvore...