Home Construction Needs & Bidding App

I'm looking to develop an app that connects homeowners with service providers for construction materials and labor.

Key Features:

- Users can post their requirements for materials like bricks, stone, sand, cement, etc. as well as labor and engineers.

- Service providers can bid on these requests.

- The customer pays a minimum amount to block the bid.

- Upon confirmation, both parties' contact details and locations are shared.

- Penalties for bid cancellations to ensure commitment.

The app must have:

- In-app payment gateway

- Available on both iOS and Android

- Three user roles: Customer, Service Provider, Admin

- User authentication via Phone Number and OTP

Ideal Skills:

- Cross-platform mobile app development

- Experience with real-time bidding systems

- In-app payment integration

- Strong understanding of user authentication systems

- Admin panel creation experience