Improve your skills. Get paid
Currently $62,355 in open challenges.
Topcoder gathers the world’s experts in design, development and data science to work on interesting and challenging problems. Members are provided with opportunities to demonstrate their expertise, improve their skills, and win cash, while helping real world organizations solve real world problems.
Topcoder has been hosting technical competitions since 2001 and is seen as one of the top online technical communities in the world.
http://www.topcoder.com
