Excel VBA Coding for Billing & Inventory

I need an experienced Excel VBA coder to develop a comprehensive billing and stock management software for me. This project will include the following key functionalities:

- Generating Invoices: The system should be able to generate invoices based on user input.
- Tracking Inventory Levels: The software should help in monitoring stock levels in real-time.
- Vendor Management: The macro should assist in managing vendor information and transactions.

Data Entry: All data will be manually entered by users, so the interface needs to be user-friendly and intuitive.

Reporting: The system should be able to generate various reports, including:
- Sales Reports: Summarizing sales over a specified period.
- Inventory Status Reports: Providing an overview of current stock levels.
- Vendor Performance Reports: Evaluating the reliability and efficiency of different vendors.
- Invoice PDFs: The ability to generate and save invoices as PDF files.

Ideal Skills and Experience:
- Proficiency in Excel VBA.
- Previous experience in developing similar software.
- Good understanding of billing and stock management processes.
- Ability to create user-friendly interfaces.

Please only bid if you have the requisite experience and can deliver a high-quality product.