Product item Import script for Magento Website

We are looking for Magento expert devoleper. I've ca. 150 Product categories that need to import Product items to each Product categories. Product Category with sub-category is created. We'll send you an excel-sheet of Product itemst for each ca.150 Product categories. One PRODUCT CATEGORIES is already imported on the website with the products, images, categories, attributes, specifications and Parameter Filter. 1. A Script is created and on setup on admin dashboard. So you to correct / improve for importing to each Product categories, because from Magneto it's extreme slowly. 2. Attribute setup, because Product item specification is different 3. Importing via new script items to each Product categories 4. Creation of Product search filter 5. Importing Pictures. Please quote only if you're Magento expert.