Can build API search across all the websites. Have develope hotel price search API for comparing prices. Can do your job. Have done scrapping of Amazon eBay flipkart many times
These are my skills related to web scraping and crawling
Have done scraping in CasperJS Phantomjs, python.
Have done testing and automation with selenium also.
Know to deal with database like mongo, mysql, Elasticsearch.
Also know to handle proxy and captcha while scrapping.