Ecommerce and Lead Gen Platform Development

I need a professional to build an ecommerce marketplace and lead generation platform for physical products.

The ecommerce platform should include:
- Multi-vendor support
- Discount and offer management

For lead generation, I want to integrate a contact form and WhatsApp.

Ideal skills and experience:
- Experience in building multi-vendor ecommerce platforms
- Strong background in discount and offer management systems
- Proficient in integrating contact forms and WhatsApp into websites
- Knowledge of user-friendly UI/UX design

Please provide examples of previous work and relevant experience.