Prestashop extension addon : Manufacturer merchandising

We are looking for an experienced Prestashop developper (PHP/MySql/Smarty/Prestashop framework) to modify Prestashop position management The goal is the creation of a module to change display position of products based on a table id_product + id_category + id_manufacturer => position requires mostly a backen interface + override of the [login to view URL] class in Prestashop 1.4.7 It will require to modify Prestashop admin tab of the manufacturer to manage products positions Only experienced Prestashop devs / An interview will be conducted onine to check proficiency and skills