Desktop Billing App for Jewel Store

I'm seeking an experienced developer to create a comprehensive billing desktop application for my imitation jewelry store on Windows. The app should streamline our billing process and integrate with various tools.

Key Features:
- Estimate Bill: Scan barcode & auto quote
- Billing Types: Gold, Silver, Advance Payments (Order Bill), Repair Bill
- Notifications: PDF, SMS, WhatsApp alerts; Email bill to customer
- Chit receipt entry & factory stock bill
- Unified software for silver and gold
- Billing and sale alert notifications from 2 different brands
- Admin sale alert notifications via email, SMS, WhatsApp
- Secure login with OTP, email

Integrations Required:
- Scanner
- 3-inch printer
- CRM

Comprehensive Reporting on:
- All sales
- Advance payments
- Stock reports
- Pending payments reports

Ideal Skills and Experience:
- Proficiency in Windows desktop app development
- Experience with barcode scanning and printing integration
- Familiarity with CRM systems
- Strong background in financial reporting and analytics
- Excellent problem-solving skills and attention to detail

Looking forward to your proposals!