I'm seeking a skilled developer to create a web-based metal roof estimating tool. The tool will need to: - Use a drag-and-drop interface for ease of use. - Provide accurate cost estimation. - Allow user profile customization with varying margins through preset templates. - Analyze and calculate roofing components from an uploaded PDF detailing roof dimensions. Ideal candidates will have experience in developing cost estimation tools, proficiency in PDF document analysis, and a strong understanding of user interface design. Please share any relevant previous work in your bids.