WordPress Print Order System

I'm seeking an experienced WordPress developer to create an online print order system. The system should include:

- File Upload: Users can upload designs.
- Price Calculator: Dynamic pricing based on user selections.
- Slot Booking: Schedule order pick-up or delivery times.
- Payment Integration: Support for credit/debit cards, PayPal, and bank transfers.
- WhatsApp Confirmation: Automated order confirmations via WhatsApp.

Ideal Skills and Experience:
- Proficiency in WordPress development.
- Experience with payment gateway integration.
- Familiarity with file upload and dynamic pricing functionality.
- Knowledge of WhatsApp API for notifications.
- Strong UI/UX design skills for a user-friendly experience.

Please provide examples of similar work done and a rough timeline for completion.