Mobile Auction App for Car Dealers

I'm seeking an experienced developer to create a mobile application for car dealers to participate in live auctions. The app should be available on both Android and iOS platforms.

Key Features:
- User authentication via phone number verification
- Real-time incremental and automatic bidding, with bid history tracking
- Detailed car listings including engine/transmission details, mileage, year of manufacture, and previous ownership records
- Notification system for bids and auction updates
- Secure payment gateway integration

Ideal Skills and Experience:
- Expertise in Android and iOS app development
- Experience with real-time bidding systems
- Strong UI/UX design skills for a seamless, user-friendly experience
- Knowledge of secure payment integration
- Proven background in developing robust authentication systems

Please share your relevant experience and portfolio.