If you want to make the world better, one of the best ways to do it is to compete with governments and large nonprofits, because they are so ineffective.
Every startup founder should read this insightful thread from Suhail about how to do interviews. And frankly every applicant should too; if you're good, Mighty is the kind of place you want to work, and most of his tips for interviewers are also implicit tips for interviewees.