Multi-Category eCommerce Marketplace Development

Project Description: Multi-Category Marketplace Platform (Similar to Mzad Qatar)
I am looking for an experienced developer to build a full multi-category marketplace platform, similar in concept and structure to Mzad Qatar.
Core Idea
The platform will allow shops, businesses, and individuals to:
Register and create their own accounts
Add listings (products or services) with photos and videos
Appear under many categories from A to Z (electronics, clothing, services, vehicles, real estate, jobs, numbers, animals, etc.)
Be contacted directly by buyers (WhatsApp, phone call, or chat)
Optionally receive orders directly or redirect customers to the seller
Key Features Required
Multi-vendor system (each seller manages their own ads)
Very large category system (similar to Mzad Qatar, not limited to one niche)
Ad posting system (not classic e-commerce only)
Featured ads & paid promotions system:
Silver: appears between listings while scrolling
Gold: appears at the top of category listings
Platinum: premium visibility (homepage banners / top priority)
Sellers can choose:
Category / subcategory
Promotion plan (Silver / Gold / Platinum)
Duration (1 day, 3 days, 7 days, 14 days, etc.)
Admin dashboard to:
Manage categories
Approve/reject ads
Manage featured ads & payments
Control banners and homepage placements
Monetization
Sellers pay for promoted ads
Different pricing per plan and duration
Payment gateway integration required (can be discussed)
Design & UX
Clean, modern UI
Similar user experience to Mzad Qatar
Mobile-friendly (very important)
Easy posting flow (step-by-step ad creation)
Technology
I am open to suggestions, but preferred options:
WordPress + WooCommerce + multi-vendor solution
OR
Custom solution if you recommend something scalable
Deliverables
Fully functional platform
Admin panel
Seller dashboard
Payment integration
Deployment & basic documentation
Please share:
Your previous marketplace projects
Suggested tech stack
Timeline
Cost estimate
Language Requirements
The platform must be fully multilingual and support the following languages:
English
Arabic (RTL support required)
Thai
Key points:
Users can switch languages easily from the interface.
Categories, listings, buttons, and system messages must support all three languages.
Sellers can post ads in one or multiple languages.
Proper RTL layout is required for Arabic.
The system should be scalable to add more languages in the future if needed.