Very small modification of Magento CSV import function

We have a function which imports and update csv files with cronjob for our Magento webshop. Each day all csv are checked if there are new products in csv files or if information is changed (for example: stock). At this moment the import function doesn't disable products in our Magento backend which aren't in csv files anymore. So products that aren't in csv files anymore need to be disabled automatically by cronjob/import function. We are looking for a freelancer who has a lot of experience with Magento and is absolutely sure that he can do the job. If you can do this project, please give us your bid and tell us when it will be ready?