Multi-User Billing Software Development

I need a billing software solution similar to Vyapara or Tally Prime for business management. It should be compatible with Windows and mobile platforms.

Essential Features:
- Inventory Management
- Invoice Generation
- Reporting and Analytics

Multi-user access with customizable permission levels is required.

Ideal skills and experience:
- Experience in developing billing or accounting software
- Strong knowledge of inventory management systems
- Proficiency in reporting and analytics tools
- Mobile and Windows application development expertise
- Experience in implementing multi-user access with permission settings

Please provide examples of similar projects you've completed.