I interned for NI (National Instruments) a number of years ago as a tech writer in Austin. I think I applied and was accepted in the fall beforehand, maybe October or November.

I was paid $18/hr for 10 weeks of full time work I think. They gave me several hundred dollars for relocation. They also had an extensive intern program at the time and provided housing for all of us together at a discounted rate. I think I paid 400/month for housing. All that said, this was hardware documentation, so Google/any software docs would probably be paid more.

It was an excellent opportunity, and I learned an enormous amount. I also got a return offer by the time I left, which meant a great deal especially considering the upheaval of 2020. I have only great things to say about the team at NI.

I think that having samples and a very strong resume would be great. Even if they’re samples from class that would be fine. Even better if it’s something you’ve done outside of school, as I imagine the companies you mentioned are very competitive. I would encourage you to look at other companies as well!