I need a fully-featured marketplace that works on both iOS and Android. Sellers must be able to create a profile, place their item into clear product categories, and build credibility through ratings and reviews. Where the project gets interesting is the sales layer: I want an AI assistant that automatically spots people who show interest, chats with them inside the app, and—when it makes sense—places an automated voice call to guide them toward a purchase. The conversation should feel human, handle basic objections, and pass the lead to a live seller only when necessary. Suggested tech such as Flutter/React Native for cross-platform speed and Twilio (or an equivalent SIP/VoIP service) for programmable voice is fine, but I’m open to any stack that achieves a smooth user experience and keeps operational costs reasonable. Deliverables I’ll be reviewing: • Production-ready iOS and Android apps, published to TestFlight / internal track for review • Marketplace core with user profiles, category browsing, and rating + review flows • AI chatbot and voice-calling module wired to real data and a test phone number • Simple admin dashboard for listings, users, and call/chat transcripts • Source code, deployment scripts, and concise hand-off documentation Acceptance criteria: every feature above must run without crashes, the AI must handle at least three scripted sales scenarios in both chat and call form, and the first sale triggered by the assistant should be reflected in the dashboard analytics. Once these boxes are ticked, the project is complete and ready for public launch.