Change Request for MS Access Stock Control Application

We are a online retail company with a multi-user stock control/sales/product info system written in MS Access. The guy who developed the application and supported it for personal reasons cannot continue. We require a number of change requests to the application but the most urgent one which is this project, is the addition of another POS/Sales Channel. It is very similar to an existing POS already setup and will require the following: - modification to existing product screen - clone and modify existing POS procedure for new POS - import/format different file format, adjust procedure as necessary - prepare check screen to identify out of stock products (again an existing procedure can be copied and modified), import/format different file format, adjust procedure as necessary - supporting table/database changes I was a system designer/developer myself for 10 years so I understand that some time will be required to familiarise yourself with the application, coding and database setup. The timescale is 2-3 weeks to familiarise/develop/implement this change request. I am looking for a developer/company with a proven track record, as this application is critical to my company's daily activities. There will be many change requests to follow so a job well done will get priority consideration on future CR's/support work.