In honor of National Engineers Week (February 19-25), we bring you our annual shout-out to the most powerful women engineers in US tech.

Yes, the tech industry is doing a well-documented terrible job of attracting women into engineering. And once they enter this male-dominated world, some women are subject to some appalling sexism and sexual harassment.

But that tells only part of the story. There are women who are leading important tech teams at important companies. And there are women who are building cool cutting-edge technologies at startups.

In other words, there are women having fabulous careers as engineers, building the technology that millions of people use on a daily basis. With that in mind, here are 43 powerful American women who are developers, designers, engineering directors, bio scientists, nuclear scientists, and rocket scientists.