Cross Platform Business Services App

I need a polished mobile app built for both iOS and Android that streamlines the way my business interacts with customers and internal staff. The core flow is straightforward: users should be able to create secure accounts, book or schedule our services, and pay (or be invoiced) directly inside the app. Both external customers and in-house team members will log in, so role-based access is essential—customers see booking and payment options, staff see their schedules and client details. I’m open to Swift/Kotlin, Flutter, or React Native so long as the final build is fast, stable, and passes App Store and Play Store review. You’ll handle everything from UI design through to deployment, set up a simple admin panel or backend that lets me view bookings and transactions, and integrate popular payment gateways that support subscriptions as well as one-off invoices. At hand-off I expect: • Source code with clear comments • A test build on TestFlight and Google Play Console • Basic documentation covering build steps, environment variables, and how to update service listings or pricing If this scope aligns with your expertise, let’s discuss timelines and milestones right away.