Yes, there are a number of tech communities, most are organic, some are explicit.
• We have explicit cross cutting groups called Ark groups consisting of very Sr engineers either relevant domain or focuses (like code quality) to provide eng wide guidance in that area.
• We have techstack specific communities for all of eng, like Android, iOS, with monthly meetups, channels, newsletters, mailing list updates, etc..
• Within orgs, they create dedicated communities, like Eats Android engineers.
• We have many self-organizing virtual teams or communities around specific projects.
• We have multiple interest based communities like gaming or music.