Real Estate Transaction App Development

I'm seeking an experienced app developer to help with the discovery phase of creating a comprehensive real estate app. The app's primary function is to facilitate the entire selling process of real estate from start to finish for a flat fee.

Key features should include:
- Digital contracts and signatures
- Integrated payment system
- Virtual property tours

Ideal skills and experience:
- Proven experience in real estate app development
- Strong understanding of digital payment systems and contract management
- UI/UX design skills for a user-friendly experience

Please include relevant experience in your application.