Efficient Web Scraper and Cross-Referencer

I am seeking a talented programmer who can design and develop a code or algorithm. The purpose of this algorithm would be to sift through a particular website for items and then cross-referencing those same items on eBay, subject to particular conditions.

Key Responsibilities:
- Develop a code or algorithm to search through a specified website for items
- Implement functionality to cross-reference sourced items on eBay under certain conditions

The website to be searched will be specified upon initiation of the project. Given that I did not indicate a preferred programming language, I am open to suggestions based on your experience and the needs of the project.

When applying, please include examples of past work that demonstrate your capabilities relevant to this project. Propose a high-level approach to the problem, including the tech stack you think will be best suited. I look forward to being impressed by your skills and experience.