I need a straightforward mobile application that lets my parlour clients book their own appointments and automatically receive SMS reminders before their visit. The booking flow should be smooth: clients pick a service, choose an available time slot, and instantly see confirmation on-screen. An SMS reminder—ideally 24 hours and again 1 hour beforehand—must go out through a gateway such as Twilio or any local provider you recommend. On the back end I want a small admin panel where I can add services, set staff schedules, block out holidays, and view or manually adjust bookings. At this stage I am not looking for inventory tracking or email notifications; the focus is purely on bookings and SMS. Please tell me about the similar apps you’ve already built and the tech stack you prefer (Flutter, React Native, Kotlin, etc.). Source code, build instructions, and a short hand-off call at the end will round out the deliverables so I can maintain the app going forward.