I need a complete billing application that runs smoothly on both iOS and Android. The core goal is to give my users an easy way to create invoices, track payments, and view basic sales reports from their phones. I am starting from scratch, so I’ll be looking to you for everything from UI/UX design through to final store submission and post-launch hand-off of the source code. Because speed is critical, I’d like to move straight into development as soon as we agree on a clear feature set and milestones. Please show me examples of similar mobile projects you have already shipped; seeing live links or store listings will help me choose quickly. Key points you should know before applying: • Target platforms: iOS and Android (single codebase solutions such as Flutter or React Native are welcome, but native builds are fine if you prefer). • Turnaround: ASAP—let me know the fastest realistic timeline you can commit to without sacrificing quality. • Deliverables: production-ready app, source code, simple deployment guide, and brief user documentation. If this matches your skill set and you can demonstrate solid past work, I’m ready to get started right away.