Artoo - Bangalore, India 
www.artoo.in
Position: Hackers for Impact (<a href="http://sameersegal.github.io/posts/Dark-Knights/" >http://sameersegal.github.io/posts/Dark-Knights/</a>)
Techstack: Emberjs + D3 + Socket.io,  Android , CouchDB, AWS + Chef
Artoo develops intuitive technology to serve people who live on less than $2 a day. We work across rural primary healthcare, financial services and distribution.
If you like rolling up your sleeves and getting your hands dirty, then this is THE opportunity. You will spend time not only developing the platform and apps, but will also spend an equal amount of time in the field -- working with users: designing around their literacy challenges!
You will get to see your impact and how you are dramatically improving quality of lives.
Please drop me a line at sameer[at]artoo[dot]in
Cheers