Multi-Platform Business Directory App

I need a custom business directory app available on iOS, Android, and Web. The app will have 5 main categories and subcategories for businesses.

Key Features:
- User Authentication: Email/password, social media, and phone number verification.
- Payment Integration: Support for credit/debit cards, bank transfers, and Stripe.
- Business Listings: Vendors can create and manage their listings.
- Analytics Dashboard for Vendors: Track contact clicks, impressions, and average watch time on their listings.
- In-App Communication: Users can save contacts and reach out via in-built chat or WhatsApp.
- Referral Program: Incentivize users to refer others.

Ideal Skills and Experience:
- Proven experience in developing multi-platform apps.
- Strong background in payment integration and user authentication.
- Familiarity with analytics tools and in-app communication features.
- UI/UX design skills to ensure a user-friendly experience.

Looking forward to your bids!