I recently joined the Platform.sh Slack (https://chat.platform.sh/), and thought the self-invite process was rather pleasant. Upon looking under the hood, I was even more impressed:

http://rauchg.com/slackin/

Shall we evaluate and consider this as an alternative to our current inviter (http://ez-community-on-slack.herokuapp.com/)? This could provide a nice, crisp entry to our Slack community on the new Developer Hub.