I need a lightweight yet reliable billing application tailored for a quick-service restaurant, built specifically for Android phones. The core functions I must see are inventory management and detailed sales reporting, alongside a smooth billing flow that supports two distinct user roles (for example, a cashier and a manager). Kitchen orders should generate printed KOT tickets automatically, so the app has to connect to a compatible receipt printer without extra steps for the staff. Real-time data sync is not essential, but an offline-first approach that syncs when a connection is available would be a plus. Deliverables • APK ready for installation on standard Android devices • Source code with clear documentation • Setup guide covering printer pairing for the KOT printouts • Brief user manual for both cashier and manager ends I’ll consider the job complete once I can install the app on my test device, create a sale, watch inventory levels adjust, and see the KOT print correctly every time.