develop marketplace for companies - web

I'm looking to develop a business marketplace website where companies for sale are listed, and buyers can contact sellers directly. The platform will not handle transactions online but will facilitate direct contact between interested parties. I need a scalable, user-friendly, fast, and secure website, with a backend to manage the business listings.
Key Features:
Main Page:
Clean, professional design with featured businesses.
Advanced search filters (location, sector, size, revenue, etc.).
Categories for different business types.
Section for testimonials and success stories.
Business Listings Management:
Backend for uploading and managing business listings (name, description, sector, price, location, contact details).
Option to highlight featured businesses.
Support for images and attached documents (e.g., financial reports).
Contact forms for each listing, with notifications to the admin or seller.
Admin Portal:
Central dashboard to manage listings.
Role-based access control for admins and sellers.
Reports on listing views and contact requests.
User Functionality:
Registration for buyers and sellers.
User profiles for sellers to manage their listings.
Private messaging system for direct buyer-seller communication.
Integrations:
SEO optimization for terms like "business for sale".
Integration with Google Analytics and Zapier for automated tasks.
Email marketing tools integration (e.g., Mailchimp).
Security and Scalability:
SSL certificates for secure browsing.
Scalable architecture (cloud-based, e.g., AWS) to handle traffic growth.
Technical Recommendations:
Platform and Tech Stack:
Frontend: HTML5, CSS3, JavaScript (preferably React).
Backend: Node.js or Django.
Database: PostgreSQL or MongoDB.
Hosting: Cloud-based, using AWS or Google Cloud.
CMS: Option to use Strapi (headless CMS) or build a custom CMS.
SEO and Speed Optimization:
Focus on technical SEO (clean URLs, dynamic metadata, image optimization).
Mobile optimization with responsive design.
Use Lazy Loading for heavy content and a CDN for faster global load times.
Development Methodology:
Phased development with clear deliverables (frontend, backend, integrations, SEO).
Version control using Git.
Extensive testing on mobile and desktop.
Maintenance:
Regular security and feature updates.
Initial post-launch support for adjustments.
Summary:
Build a marketplace for business listings focused on direct contact between buyers and sellers.
Implement a robust backend for listing and user management.
Prioritize SEO for organic traffic.
Provide a scalable, secure, and optimized user experience.
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