Running a small trading business means juggling invoices, daily expenses, and stock movement all at once, so I want a single Android APK that brings everything into one streamlined workspace. The core of the build is straightforward: the app must let me raise professional invoices, log and categorize every expense the moment it happens, and pull clear financial reports (P&L, balance sheet, cash-flow snapshot) whenever I need them. On the inventory side, I need real-time stock level tracking that alerts me when items dip below a set threshold, simple order processing so I can record each sale or purchase, and a tidy area to store supplier details for quick reordering. All of this should feel cohesive—no jumping between separate modules, and absolutely no desktop dependency. Because the team relies solely on Android phones and tablets, the finished deliverable must be a production-ready APK plus the full, well-commented source code. A lightweight local database is fine, though the option to sync to the cloud later would be a bonus. UI can stay clean and utilitarian; function comes first. Acceptance criteria • Installable APK runs on current Android versions without crashes • Invoicing, expense tracking, and financial reporting each work end-to-end with sample data • Stock, order, and supplier management update in real time and cross-reflect in financials • Source compiles in a standard Android toolchain (Java/Kotlin or Flutter/Dart—your call) and includes concise setup notes If this sounds like a build you can turn around efficiently, let’s talk timeline and any clarifications you need.