I’m looking to put together a lean, working prototype of a billing application that runs on iOS, Android, and the web. The immediate goal is an MVP I can later expand, so the build should stay clean, modular, and easy to hand off. Scope for this first phase • Secure, role-based login for three roles—admin, employees, and customers. • Fast bill generation with itemised tax/discount fields. • Simple record-entry screens that commit data to a lightweight cloud database (Firebase or similar). • One-click PDF export of each bill with direct share to WhatsApp. • Basic ledger showing customer-wise balances and credits. • Snapshot reports for sales and credit plus a single-page dashboard that doubles as a light CRM. The system will initially target retail and restaurant workflows, so screens and terminology should match those environments. Tech is flexible—Flutter, React Native, Ionic, or another cross-platform stack—so long as I receive: 1. Source code with clear comments. 2. A brief setup guide so my team can keep improving it after delivery. If you’ve built comparable POS or billing solutions, please share a short demo or repo link in your bid. I’m aiming for a straightforward, stable foundation that can grow over time.