Can develop this feature in Python. Can read user pass from a file and check for the existing account. Can use proxy and captcha both into the programme. Have done scrapping of Amazon many time can do your job . you can check sample over my portfolio
These are my skills set related to Web and Web crawling
Have done scraping in Nodejs, CasperJS Phantomjs, python Scrapy Framework.
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