I need a straightforward engineering services booking app that runs on iOS and Android. The whole experience should feel as familiar as any on-demand platform: a user opens the app, browses available engineering specialties, picks the service, chooses a time slot, and confirms the request. The single must-have feature is a smooth Service booking flow. Project tracking, consultation scheduling, and even a future Web version remain optional for later phases, so a modular architecture that leaves the door open for them would be ideal. Whether you prefer native Swift + Kotlin or a high-quality cross-platform toolkit such as Flutter or React Native is fine with me, provided performance and UI polish stay first-class. A cloud back end—Firebase, AWS Amplify, or something comparable—can handle authentication, real-time updates, and push notifications. Secure card and mobile-wallet payments have to be integrated into the checkout. Deliverables • Fully functional iOS and Android apps covering sign-up/login, service catalogue, booking workflow, payments, push notifications, and basic profile management • Lightweight admin dashboard where providers accept or decline jobs and update status • Unit and UI test coverage plus a concise technical hand-over document • Guidance through TestFlight and Play Store submission until both builds are approved Acceptance criteria: both apps pass App Store and Play Console review, every listed flow works end-to-end without crashes, and booking confirmation latency stays under three seconds on a standard 4G connection. An initial MVP in roughly six weeks would be perfect, though I can adjust if it helps quality. Please include the stack you plan to use and links to any live apps that showcase similar booking logic.