Hobbyist coders who are eager to get started might find it useful to
start getting familiar with MediaWiki:
https://www.mediawiki.org/wiki/How_to_become_a_MediaWiki_hacker
and set up their own bleeding-edge MediaWiki installations:
https://www.mediawiki.org/wiki/Download_from_Git
Other Wikimedia technology projects that you might want to get familiar
with:
https://meta.wikimedia.org/wiki/Developer_hub
Hope this helps!
--
Sumana Harihareswara
Volunteer Development Coordinator
Wikimedia Foundation