Two-Sided Marketplace Mobile App
Budget: $5,000 – $10,000 USD
I am building a full-featured mobile marketplace that runs smoothly on both iOS and Android. The app will present two completely separate experiences: one dashboard for customers and another for sellers.
Core experience
• Customers and sellers can each create listings, upload multiple photos, and have every image automatically scanned and sorted into the correct category so products stay organized without extra effort.
• A real-time chat layer lets the two parties negotiate, share more images, and finalise details inside the app.
• Push notifications will alert users to new messages, offer updates, and deal milestones.
• Every transaction—from first contact through payment confirmation—must be logged so that both parties can review their full deal history at any time.
• Sign-in relies on phone-number OTP as the primary authentication flow.
• Physical goods and digital products are both supported, so file-delivery logic will sit alongside shipping-status tracking.
• All data, including images, chat logs, and payment information, has to be stored and transmitted with strong encryption and follow best-practice security standards.
Deliverables
– Production-ready iOS & Android apps (source code included)
– Admin-level analytics console showing user counts, sales volume, and dispute flags
– Documentation for build, deployment, and maintenance
– Brief video walkthrough demonstrating each major feature
Acceptance criteria
1. Separate buyer/seller views verified on real devices for both platforms.
2. Phone-number OTP login passes a security audit (rate limiting, token expiry, etc.).
3. Image scan correctly auto-tags at least 90 % of test photos.
4. Push notifications arrive within 3 seconds in test scenarios.
5. End-to-end deal flow (listing → chat → checkout → confirmation) completes without error.
If you can deliver the above with clean, well-documented code and an eye toward future scaling, let’s get started.
Core experience
• Customers and sellers can each create listings, upload multiple photos, and have every image automatically scanned and sorted into the correct category so products stay organized without extra effort.
• A real-time chat layer lets the two parties negotiate, share more images, and finalise details inside the app.
• Push notifications will alert users to new messages, offer updates, and deal milestones.
• Every transaction—from first contact through payment confirmation—must be logged so that both parties can review their full deal history at any time.
• Sign-in relies on phone-number OTP as the primary authentication flow.
• Physical goods and digital products are both supported, so file-delivery logic will sit alongside shipping-status tracking.
• All data, including images, chat logs, and payment information, has to be stored and transmitted with strong encryption and follow best-practice security standards.
Deliverables
– Production-ready iOS & Android apps (source code included)
– Admin-level analytics console showing user counts, sales volume, and dispute flags
– Documentation for build, deployment, and maintenance
– Brief video walkthrough demonstrating each major feature
Acceptance criteria
1. Separate buyer/seller views verified on real devices for both platforms.
2. Phone-number OTP login passes a security audit (rate limiting, token expiry, etc.).
3. Image scan correctly auto-tags at least 90 % of test photos.
4. Push notifications arrive within 3 seconds in test scenarios.
5. End-to-end deal flow (listing → chat → checkout → confirmation) completes without error.
If you can deliver the above with clean, well-documented code and an eye toward future scaling, let’s get started.