There's a movement called "effective altruism", who ask exactly this question. You don't have to agree with everything they are saying, but thinking about goodn

There's a movement called "effective altruism", who ask exactly this question. You don't have to agree with everything they are saying, but thinking about goodness extremely pragmatically and almost numerically does have merit I think. Increasing computer literacy might be a really strong way you can improve things in your own community. NGOs are also notoriously tight on money, and have huge problems finding good Software Engineers, because they can't pay competitive rates. Having worked for a while in that space, I do think it can be quite satisfying!