If you want to use your technical skills to make a difference in the world, a lot of less glamorous options are out there: working for a non-profit, working for a university, school system, library system, or other government entity of your choosing.

> One example I've heard so far is Tesla. Any others?

Lol, Tesla is not an example. They are a carmaker. Nothing Tesla does will change the world for the better. In fact investing in automobiles in any form is counter-productive when we should be reverting post-war city design mistakes. The best thing for the world would be to live in walkable communities with inter-city trains taking care of long-distance travel.

Tesla is a great example of the flaw in your question: looking toward a highly-funded company out to change the world is an impossibility. Highly funded companies are expected to produce revenue growth. That’s it. There’s no such thing as a for-profit company out to solve world problems unless solving those problems involves increasing profit.

So, like I said, what you’re looking for is probably a non-profit, a government agency, or research institution.

And don’t expect to get highly competitive salary to do work that helps people.