Create Beautiful App Using Existing APIs

I am looking for a programmer/designer who can create great looking web apps. This project will utilize 2 APIs to display websites and an analysis of those sites. Being able to create attractive charts/graphs (open source preferred) is important as well as having a great eye for usability. System will take a keyword as input, send an api request and then collect URLs in response. This api should repeat daily. System will need to track the responses and display an easy to see historical view of which sites have gone up and which sites have gone down over time in the ranking returned from the API. Each result should be able to be clicked to display more details of the site (another api request provides this detail). Application must be scalable (use amazon cloud preferred) and fast. This is also design oriented so looks are important. API documentation available upon request. Please provide 1 or 2 examples of recent projects so I can review their design.