Hello,
My name is Rui Pimentel, more recently known for developing crawlers for netflix, nike, supremenewyork and so many other trendy websites. With more than 8years of experience in development of web crawling and automation tools, I'm sure I'm the right choice for this task.
I've fully read your project's description and I completely understand what you need, I've done this before multiple times. My solution would be developed fully in PHP, and my proxy solution would involve digitalocean. I can use their API to create temporary vps with proxy software installed, and use it as proxies. They bill you hourly and I can give you a 10$ credit on sign up.
Please let know if you're interested, and confirm me the details of the project, my bid might be adjusted upon knowing that information.
Thanks
Rui