I need a simple yet robust system that lets a visitor scan a QR code at my door, see a short page that allows them to reach me instantly, and do so without ever exposing my personal phone number or email. Here is how I picture it working: • Purpose – The code’s only job is information display: on scan, a clean web or in-app screen appears. • Visitor experience – They tap a button to send me a text message or place an in-app voice call. That’s it; no signup, no data entry, no contact info revealed. • Owner experience – I receive the message or call inside a lightweight companion app (iOS and Android). A push notification tells me someone is at the door; I can reply by text or pick up the call immediately. Deliverables • Dynamic QR generator tied to unique IDs (one or many per property). • Mobile-friendly landing page that triggers “Text Message” and “App Call” actions. • Native or cross-platform owner app with real-time messaging/calling, push alerts, and basic history. • Admin panel to edit the welcome text, temporarily disable a code, or redirect to a new number. • Source code and brief setup documentation so I can host the backend on my own server or a common cloud service. Acceptance criteria 1. Scanning the QR from any modern phone launches the landing page in under three seconds. 2. Text and call reach the owner app every time, with notification even when the app is in the background. 3. No visitor ever sees my personal contact details in the network traffic or interface. 4. Codebase passes a quick security review (HTTPS enforced, tokens or OAuth for authentication). If you have built similar contactless visitor or access-control tools before, I’d love to see a short demo or link.