Buy & Sell Car Marketplace App

I’m looking to build a modern mobile car marketplace application similar in experience to mobile.de or AutoScout24, where users can easily buy and sell vehicles through a clean, fast, and user-friendly platform.

The app should support both buyers and sellers. Sellers must be able to create accounts, upload vehicle listings with photos and details, and manage their ads. Buyers should be able to browse, search, filter, save listings, and contact sellers directly through the app.

Core Features:
• User authentication (Email, Phone Number, Google/Apple login)
• Create and manage car listings
• Multiple image uploads with automatic image compression and optimization
• Car detail pages with:
- Photos gallery
- Vehicle description
- Price
- Brand and model
- Mileage
- Year
- Fuel type
- Transmission
- Location
- Seller information
- Listing publish date
- Listing views count
- Add to favorites button

• Advanced search and filtering:
- Make and model
- Price range
- Mileage
- Year
- Fuel type
- Location

• Favorites / Saved Cars
• In-app messaging between buyers and sellers
• Push notifications for messages and listing updates
• Dealer / showroom accounts with multiple listings
• Report and block functionality
• Admin panel for managing users, listings, and reports

Seller Profile Features:
• Dedicated seller profile page
• Seller type:
- Private seller
- Dealer / showroom

• Seller verification badge
• Seller rating and reviews
• Total number of active listings
• Seller contact information
• Seller profile image/logo
• Join date
• Ability to browse all cars from the same seller

User Flow:
Sellers create an account, upload photos and vehicle details, and publish listings. Buyers browse vehicles using search and filters, open listing pages, save favorites, view seller profiles, and contact sellers directly through in-app chat.

Technical Requirements:
• Cross-platform mobile app (Flutter or React Native preferred)
• Backend using Firebase or another scalable cloud solution
• Fast and lightweight performance
• Optimized for slower internet connections
• Clean, scalable, and well-documented code
• Secure database structure and authentication
• Push notification integration
• CDN/image optimization preferred

Design Expectations:
• Modern and minimal UI/UX
• Smooth browsing experience
• Fast loading speed
• Responsive layouts for different screen sizes
• Clean car browsing experience with swipeable image galleries

The first version should be an MVP with scalable architecture for future upgrades and additional marketplace features.