If you're targeting companies like google, facebook, etc. They're looking for excellent algorithm solvers. Ideally, people who can right a complex function on a whiteboard in a very short amount of time (under 15 minutes).

That's it.

Your past experiences don't really matter. My best advise is for you to memorize as many algorithm problems as you can and to make your Resume look like you'd be someone who could easily crack a "technical" interview. They usually look if you've already worked for one of these companies in the past, if you've graduated from a prestigious institution, with an excellent GPA, if you've won a hackathon and things like that. Forget about buzz words, technologies, prior projects and open source stuff. We all do that by default. Unless you're someone like Guido van Rossum, they don't really care.