My team and I have been working in Salesforce since 2009. We have been responsible for design, administration, development, and architecture. Our team have create the SalesForce implimentation for the largest data SalesForce has ever seen. We have been able to build a platform for PaaS and SaaS in the SFDC framework a number of times. Without specifying the Fortune 500 companies we have done this for please know that these companies are now very successful leveraging their competitive advantage over their competition because of our work.