I need a complete Android marketplace application that lets users browse, list, and securely purchase items inside one intuitive interface. The core flow is similar to other peer-to-peer buying platforms: account creation, product listing with images, smart search & filtering, in-app chat between buyer and seller, cart / checkout, and a simple order-tracking panel. My priorities: • Native Android build (Java or Kotlin) so performance remains smooth on mid-range devices. • Clean, modern UI that follows current Material Design guidelines. • Firebase or another reliable back-end for authentication, real-time messaging, and data storage; open to alternatives if you can justify the benefits. Deliverables I expect: 1. Source code repository with clear commit history. 2. APK ready for internal testing plus a signed release build. 3. Brief developer handbook covering setup, key modules, and how to push future updates. Once the core marketplace loop works flawlessly and passes basic QA on Android 11+ phones, we’ll wrap up the project. Please tell me which libraries you propose, any similar apps you’ve shipped, and a realistic timeline for completing this first production release.