I’m a developer and could I join any project.
Are you asking how to start contributing to some .Net Foundation project?
You don’t need to officially join a team to do that, just pick a project that you’re interested in, figure out what you could help with (issues marked as up-for-grabs on GitHub tend to be a good start) and then create a Pull Request with your changes. Adding a comment on the relevant issue that you’re about to work on it could also make sense (especially for larger changes).
If I misunderstood and you’re actually asking something else, could you clarify what it is?
Many thanks svick, this is what I’m actually asking about.