Android Multi-Client Billing Upgrade

I already run my fruit-shop billing on an Android app that tracks items, produces single-client bills, and keeps customer ledgers. Now I need the workflow to serve several walk-in clients at the counter at the same time.

Here is what the upgrade must do: • Let me open and keep multiple client tabs or sessions concurrently, add items to each, and switch between them without losing data. • On checkout, allow one-tap printing of every open bill in sequence through the existing thermal/Bluetooth printer.

The new code has to blend smoothly with the current database structure and keep each customer’s ledger intact. A clean, minimal UI is essential so staff can learn it in minutes.

Deliverables • Updated Android source and APK with simultaneous multi-client billing and multi-bill printing enabled • Short setup note explaining where you touched the code

If this sounds straightforward for you, I’m ready to share the current project and walk through the existing classes and printing module. Budget: INR 600–1500 Skills: PHP, Java, Mobile App Development, Android, User Interface / IA, Software Development, Database Development, Mobile Development, Android App Development, User Experience Research