I am not based in US!
But I have +10 years of experience in Python programming and I am expert in working with REST APIs.
I have worked with Twitter, Bigcommerce, Salesforce, Docusign Google services and many other REST APIs before. I know how work with OAuth2 and other authentication mechanisms.
On freelancer to see examples of work, you can simply look at our projects done before with other employers review;)
Let's discuss more in details if you are interested in working together.
Thanks, Helmot