Garage Management Kotlin Android App

I need a fully-featured Garage Management application built in Kotlin that runs smoothly on both smartphones and tablets. Core modules include customer and vehicle records, job-card creation with live service tracking, billing and invoicing, and a notification layer. A simple customer login (email + password) must gate access to their own service history and invoices.

The code should follow clean MVVM architecture, use Retrofit (or equivalent) for REST calls, Room or SQLite for local persistence, and Firebase for cloud messaging and analytics. I expect concise, well-documented Kotlin that is easy to scale and hand over.

Please share links to Android apps you have shipped, highlight Kotlin projects that use MVVM, Room, and Firebase, and give me a realistic timeline plus a price breakdown (fixed or hourly—open to either).

Delivery milestones will be aligned to:
• UI wireframes & approved screens
• Core CRUD flows for customers/vehicles
• Job-card lifecycle with status sync
• Invoice generation & PDF share
• Notification triggers tested on device and emulator
• Final APK + source pushed to Git

If you value clean architecture and predictable releases, let’s get started.