Auto-Notify Complaint Tracker -- 2

I want a mobile app that lets me enter a complaint once, choose any contacts already stored in the app, and have that message automatically reach every selected number in one tap—SMS, WhatsApp, or another reliable channel you recommend.

Key flow
• Create complaint → select contacts → send automatically
• App logs date-time and keeps a live counter of “pending days” for each open item until I mark it resolved
• Simple list view with filters for open vs. closed complaints and a detail screen showing the running day count

There’s no hard deadline, so you can prioritise a clean, maintainable code-base. I’m happy to discuss whether you build natively for Android or use a cross-platform framework such as Flutter or React Native; whichever delivers a smooth user experience and easy contact integration.

Please outline your chosen tech stack, any third-party services you’d integrate for messaging, and how you’ll handle data persistence so the day counter stays accurate even after the app restarts.