Ask HN: Volunteer opportunities over Slack?

I'd love to help mentor/coach folks trying to learn programming, and would like to do it over Slack (or something close to it).

I'm thinking for others like me would find this to be an extremely convenient way to volunteer. I could set aside an hour, or more, while sitting in front of my computer.

Ideally there is already a 'vetted' slack channel where people who needed the help were in need of help ... but not abusing it. I'm thinking of a Slack channel for a non-profit, coding bootcamp. Just to be clear; I'm not looking at making the bootcamp or something like it. I'm looking to just offer my services to the students in a way that works out with my schedule too; it would let me give more time.

Anyone seen something like this already that they could recommend?