Preestashop expert needed

I need a presta shop expert who can work on my prestashop. What we want is when a order is placed we want to do partial shipping like we have orders of 10 products and we have 5 products in stock we want ship 5 products and balance will show as pending for delivery which we will do later. We need the email should go to customer on very change of status of delivery We need some thing like enclosed. This changes to be made in a module as we do not want to loose updation in case of preestashop upgradation Successful programmer can have more work form me