Cross-Platform E-commerce App Development

I'm looking to develop a robust e-commerce mobile app for both iOS and Android platforms. The app should include:

- User Authentication
- Product Catalog
- Payment Gateway Integration
- Seller App
- Shipping Integration
- Customer Support, AI & Chatbot integration

Ideal candidates should have/be:
- Proven experience in mobile app development, especially for multi-vendor e-commerce platforms
- Strong knowledge of payment gateway integration, logistcs aggregator integration .
- AI based autofill features for product description/catalog.
- Automated Notification & Alert systems
- Familiarity with shipping integration APIs
- Experience with both iOS and Android platforms.
-Knowledge of graphics design tools and other such relevant skills.
- Responsible for full delivery of the working app with all it's files and techstacks.


Please provide examples of previous work and relevant experience.