I’d like to help, do any fediverse apps use node on their backend?

I’m learning web development. I’m on databases at the moment, postgresql in particular. I thought it might be fun to try to help with a fediverse project or two, but I’m only knowledgeable about node.js, and npm, do any fediverse projects use that? I also may be diving too deep too early with this. Appreciate any feedback you guys have!