The Sitecore community slack is where most Sitecore developers chat. The group is just shy of 5000(4,949) members and is growing every day. Here you can ask questions to fellow developers on problems you are facing. In the past, I've been stumped on difficult problems and everyone loves to help. If you are knowledgeable on Sitecore you can be awesome and answer questions! You can find channels on any Sitecore Topic. You won't find any recruiters as they are not allowed in the group.