Rapid Vibrant Android MVP

I need a small-scope Android MVP turned around quickly. The build has to feel lively and fun—the UI should pop with a vibrant, colourful palette rather than the usual minimalist grey. Core functionality is limited to three essentials so we can stay lean:

• Secure user authentication (email, Google, or phone—happy to follow your recommended flow)
• Fully functional in-app purchases tied into Google Play Billing
• Push notifications handled through Firebase Cloud Messaging

I will supply the basic screen flow, brand colours, and any graphics I already have; you translate that into working code and a polished APK. Whether you prefer Kotlin, Java, Flutter, or React Native is up to you—speed and a lovable interface are the priorities.

Deliverables:
1. Production-ready APK and signed AAB
2. Clean, well-commented source code in a private repo
3. Short hand-off guide outlining build steps, libraries used, and how to trigger notifications or manage products
4. One quick revision cycle after first demo to iron out UI tweaks or minor bugs

Acceptance criteria: user sign-up/login completes without errors, test purchase flows and restores work on sandbox, and push alerts reach the device when triggered from Firebase console.

If this sounds like your kind of sprint, tell me how fast you can ship a clickable prototype and your favourite toolkit for the job.