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who can include a new design (PSD) in an existing webshop? its an individual coded ecommerce system. if possible edit existing bugs and make the system better. optimize it. i dont know how long you need for this, but i think more than 1-2 weeks. pls calculate and write us your price based on this time. pls dont bid if you have not many experience with ecommerce and if you dont a php and mysql expert. and bid only, if you have a team. no 1 person companies pls.
if possible send us few links to systems you coded individual for clients, that we can take a look of the quality.