Cross-Platform Multivendor App Development

I'm seeking an experienced mobile app developer to create a comprehensive multivendor mobile application for both iOS and Android platforms. The app should facilitate vendor registration and management, product listing and search, as well as order processing and tracking. Additionally, it should integrate a payment system with a single payment option.

Key Requirements:
- Vendor registration and management
- Product listing and search functionality
- Order processing and tracking
- Payment system integration with a single option

Ideal Skills and Experience:
- Proven experience in developing cross-platform mobile applications
- Strong knowledge of vendor management systems
- Expertise in implementing payment gateways
- Familiarity with product listing and order tracking functionalities
- UI/UX design skills for intuitive and user-friendly interfaces

I'm looking for a developer who can bring this project to life efficiently and effectively. Please provide your portfolio and relevant experience.