create a script which scrape website and save output as json format and it should use ip rotation from free ip proxies

I am looking for a skilled freelancer to create a script that will scrape a specific website and save the output in JSON format. The script should be able to handle dynamic websites and use IP rotation from free IP proxies.

Ideal skills and experience for this job include:
- Proficiency in Python programming language
- Experience in web scraping and working with APIs
- Knowledge of IP rotation and proxy management
- Attention to detail and ability to handle large amounts of data

Please note that I will provide the website URL for scraping.