Desire for help in Metasearch infrastructure on website

We are seeing for experienced computer programmers that have built search engines met search or indexing sites in the past. We are seeing to integrate a Metasearch function on our Joomla site.

The metasearch engine will be exactly used for finding 3D models (.stl extension) for 3D printing on all known sites that serve as repositories for 3D printing models. These sites will be for example Thingiverse, Cadigo etc.

Rather than a conventional metasearch which retrieves information from other search engines the metasearch tool we are looking for will retrieve from directories what we locally assign so it does not search for the entirety of the internet. This search function will seeking for metatags, tags and titles on specifically assigned sites as well as will be able to return the search result with a thumbnail and the listed title from the other directories.

The script for the local assigned sites should be changeable on the back end

I require following Skills CSS, HTML, PHP, Database, Web Programming