Cross-Platform Telemedicine App Development

I want to build a full-featured telemedicine application that runs smoothly on iOS and Android smartphones, scales to tablets, and offers a companion web experience for desktop users. The core flow is straightforward: patients should be able to request a check up, get health metrics captured and automatically store in their profile.

I will rely on you for both the mobile clients and the entire backend—including real-time video, encrypted messaging, user authentication, and a simple admin dashboard where clinicians can review session history and manage availability. A clean, modern UI, push notifications, and solid error handling are must-haves so the app feels polished from day one.

Deliverables
• Native or cross-platform iOS and Android builds ready for App Store & Play Store submission
• Responsive web interface for desktop access (can share codebase with mobile if you choose Flutter, React Native + web, etc.)
• Cloud-hosted backend with REST/GraphQL APIs, secure media streaming, and a lightweight admin panel
• Source code in a private repo, build instructions, and basic documentation so another developer can pick it up without guesswork

Acceptance criteria
• A test user can open the app on phone, tablet, or desktop, create an account, start a video session, and end it without crashes or noticeable lag
• All traffic and stored data are encrypted; credentials never travel or persist in plain text
• Code passes the standard linting/format checks for the chosen framework and builds without manual patching

If that scope feels clear, tell me how you would architect the stack, which video SDK you prefer, and a realistic timeline for an MVP.