FULL TIME ACCOUNTANT BOOKKEEPER TO DO MONTHLY INVOICES

We are a small business with about 400 customers and need a detail-oriented person to do our monthly invoices. We have changed our fee structure and are in the process of setting up a new billing and invoicing method. These invoices would be emailed to our customers every month.
The person we are looking for needs to have a good command of English as there will be ongoing contact with our office here in New York City as well as possible email correspondence with clients regarding their billing. We have a specialized program we use to track our customer activity that the person in this position would need to be trained to analyze. They would then transfer the pertinent data to an online invoice template.
Intermediate to advanced knowledge of Microsoft Excel and Word is required. Confidentiality of the information in these reports is extremely important. We would require at least two business references.
Once we establish the time needed to execute the monthly invoices, there could be additional assignments.
Salary is approximately 12,500 pesos a month.