Where would you look for save-the-world/do-good jobs?

Say you are a SW developer or sys admin or something akin to these. Say that you are not after big money (but you still have family to support). Say you want to help solve one of the many social/global/you-name-it issues through your work. The question then is - where would you look for a job? Which industry/job boards/etc? Do you know anyone that does that? Any pointers welcome.

PS1: The person asking how to save the world is currently doing DevOps (continuous integration). PS2: Eligible to work in EU. PS3: Thanks in advance to whomever takes the time to answer.