ajax category filter on main page

I need a custom component that will be some kind of filter made in ajax. On main page after site load we see articles from all 4 subcategories in K2 component. After click on the one button from four different buttons [each one for one subcategory] site shows articles only from this one subcategory connected with button we already clicked. What is important: articles have to load without site reloading [ajax]. Articles must have same look as it is in K2 [title, date, author, comments, read more]. I'm looking for good, fast programmer, that knows what to do and have an experience.