You should visit Dolphin's IRC channel on Freenode (#dolphin-dev). Freenode's website has a webchat client in case you don't have a dedicated IRC client -> https://webchat.freenode.net/
Checkout the github page for recent code commits, pull requests, issues, and the like, also browse the source code -> https://github.com/dolphin-emu/dolphin
Lastly, have a look at the issue tracker if you're interested in tackling specific problems -> https://bugs.dolphin-emu.org/projects/emulator/issues/
Good luck, and we hope to see your work soon
Checkout the github page for recent code commits, pull requests, issues, and the like, also browse the source code -> https://github.com/dolphin-emu/dolphin
Lastly, have a look at the issue tracker if you're interested in tackling specific problems -> https://bugs.dolphin-emu.org/projects/emulator/issues/
Good luck, and we hope to see your work soon