LinkedIn and GitHub are partnering to release over 40 software development courses, all free for a limited time.

The computer science course at Harvard University, available on-campus or online, is renowned for its rigorous, well-taught material and high production value.

In 2011, trawling YouTube for other course material, Guimaraes clicked on a lecture from Harvard’s introductory computer-science class, CS50, which was taught by a young professor named David Malan.