EdX has moved all documentation related to developers to an open web space:
https://openedx.atlassian.net/wiki/display/OpenDev/Open+edX+Development
So far a large amount of technical materials about edX architecture and engineering were not indexed by search engines and were only accessible by registered users.
“Our intention is to continue making as much wiki content as we can default to open access. (…) We are also in the process of deprecating the edx-platform GitHub wiki, and so over the next few months that content will be migrating into the new development wiki,” explained Andy Armstrong, edX UI architect.One of the most promising new spaces is the Open edX Answers, where solutions to questions from the Open edX community will be provided.