You, the software engineers and leaders of technology companies, face an enormous responsibility. You know better than anyone how best to protect the millions who have entrusted you with their data, and your knowledge gives you real power as civic actors. If you want to transform the world for the better, here is your moment. Inquire about how a platform will be used. Encrypt as much as you can. Oppose the type of data analysis that predicts people’s orientation, religion, and political preferences if they did not willingly offer that information.