I am a python programmer who specializes in web crawling and web scraping.
I can extract a data you need from a website and deliver you accurate results in a required format (json, csv, excel, xml, amazon s3, MySQL, etc.).
Data extraction can be done either by parsing html or by using a website's API (if such is provided by web site/web service).
I often use Scrapy and Selenium (for dynamic websites), though I don't limit myself to these tools. The choice of a tool depends on the website.