We are currently testing Google Adwords and Yahoo ads for our website. We are looking for someone with experience in accurately tracking and analyzing conversion rates and return on investment using third-party tools like HyperTracker or something comparable that you have experience with. Ideally, we'd like to track sales to specific search engines, PPC ads, and keywords. Candidates should have experience with scripting and installing scripts for HyperTracker (or equivalent), multivariate testing, A/B/ testing, as well as analysis of conversions and ROI. Experience with sales letter websites, integrating [url removed, login to view] systems and up-sales would be a plus (if you can, please provide descriptions and links to sites you have successfully worked with to increase conversions and ROI).