I need a clean, lightweight Android application that focuses on four key screens: 1. Secure Login • Email-and-password authentication only. The flow should store credentials safely and keep users signed in between sessions. 2. Inverter Dashboard • A single screen that fetches and shows real-time data from the inverter API I will provide (power output, status, temperature, etc.). • The data must update live without forcing the user to refresh. 3. Profile • Show the user’s basic details (name and email) alongside custom fields pulled from an existing Google Sheet. A quick sync button to refresh the sheet data is required. 4. Referral System • Each user receives a unique referral code. • The app should let them share the code, track who installs via that code, and display a simple count or list of successful referrals on the profile screen. Deliverables • Complete Android Studio project (Kotlin or Java) with clear package structure. • APK for testing plus signed release build. • Short setup guide covering API endpoints, Google Sheets linkage, and how the referral tracking is implemented. I’ll provide API documentation, Google Sheets access, and any brand assets you need. Clean UI, efficient data handling, and readable code are a must.