Custom Web-based POS System Development

I'm looking for a skilled developer or team to either optimize our old Free Pascal-based POS system or build a completely new one tailored to our needs.

Key Requirements:
- Retain and improve unique business functions:
- Unique product categorization
- Customized invoicing and reporting
- Develop a user-friendly front-end for store employees on a Windows PC or Web-based
- Create a robust backend for warehouse stock management, statistics, and user rights
- Ensure system runs smoothly on our own web server, with potential for future upgrades

Ideal Skills and Experience:
- Proficient in Free Pascal and Windows software development
- Previous experience in POS system development
- Strong understanding of backend development and server management
- Ability to create customized software according to specific business needs
- Good communication skills for potential long-term partnership

We're not considering off-the-shelf POS solutions due to our unique requirements. I would appreciate a price estimate for this project and am open to discussing the final cost of the system. Looking forward to your response.