buy buyer seller data of gem portal

I'm seeking an expert to construct a user-friendly platform tailored for efficacious trading of data. The project's essence is to create a nexus point for buyers and sellers to interact and transact securely. While I haven't specified the type of data, versatility must be a core feature.

Ideal Candidate:
- Proficiency in web development
- Experience with data security
- Strong UI/UX design skills
- Knowledge of payment gateway integration
- Familiarity with real-time communication tools

Requirements:
- Develop a comprehensive portal supporting various data types.
- Integrate a secure login/registration system.
- Implement a robust communication system.
- Ensure high-level encryption for data transactions.
- Include a rating/review system for users.
- Build an admin dashboard for monitoring activities.

Communication Protocols:
- Incorporate live chat for real-time inquiries.
- Email messaging system for documented communication.
- Video conferencing capabilities for in-depth discussions.

Applicants must submit a detailed proposal showcasing their experience and past work that demonstrates their capability to deliver a project of this complexity. A clear approach and methodology for the platform development should be outlined.