Web-Based Real Estate Net Sheet Generator

I need a web-based tool called the "Net Sheet Generator" developed. This tool will aid real estate agents with numerous functionalities specifically:

- Calculating expenses and fees
- Generating accurate net sheet calculations
- Saving and exporting data for future reference

This comprehensive tool will need to include specific variables such as:

- Purchase price
- Loan amount
- Closing costs
- Commission fees
- Taxes
- Net proceeds

Additionally, to offer more flexibility, I require the "Net Sheet Generator" to handle taxes and commission fees in the following ways:

- Automatic calculations based on predetermined rates
- Accommodate user input for custom rates
- Provide options for different tax jurisdictions

The ideal candidate for this project will possess strong web development skills along with some knowledge in real estate to enhance the functionality and user-friendliness of this tool. Previous experience developing similar tools will be a definite plus.