Wouldn't they look good as my first job in my resume for a person who recently graduated that never had a software job?
It was my first software job and as far as I can tell it's an amazing thing to have on my resume.
With the TN visa, you just need the proper documentation and they issue it at the border. The company doesn't need lawyers or filings; it's all on you.
I'm sure a big company like Amazon has experience here. If you're job hunting and are talking to smaller companies, you might have to educate them about how the TN works because many don't know it exists and assume they'll have to pay a lot of money to hire a Canadian.
If you've never come in on a TN visa before it's worth the ~$400 in lawyer fees to get them to review the TN letter and coach you on the procedure.