Hey, I was notified about this project by Freelancer. I'm interested in this project. From my understanding, you want to use several web store APIs and analyze the prices with Amazon's. I'm looking forward to using node.js to do the backend crawling/scraping. I have tons of experience working with APIs, web crawling, web scraping, and number crunching. Additionally, I've done projects which generate charts and tables after crunching some numbers; most notably, my project in HP. I still need more information on this project since I don't think I fully understand the whole idea. My English is proficient and all my past clients loved me. I'd love to hear more about this web app. Feel free to contact me, thank you for reading my bid!