Mountain View, CA - full-time designers and mobile devs
Khan Academy's mission is to provide a free world-class education for anyone anywhere. Over 1 billion math problems have been done on our site and 2 million more are done each day. Here's some stuff we've been working on lately:
  *  creating adaptive assessments to accurately measure student knowledge
  *  running new A/B tests every week to learn how best to teach students and grow our userbase
  *  building infrastructure to allow us to scale up our content creation efforts
  *  internationalizing our entire website to enable pilot implementations in Mexico and Brazil

If this sounds interesting to you, we'd love to hear from you. Right now, we're focusing on hiring product designers and mobile developers. Come build with us:
  https://www.khanacademy.org/careers