I’m looking to have a cross-platform mobile app built for both iOS and Android that keeps a running total of the days I’ve spent outside my home country. The core flow is simple: 1. I enter or import individual departure and return dates. 2. The app instantly calculates the number of days abroad for each trip and maintains a cumulative tally that updates every time I add, edit, or delete a date range. 3. A dashboard shows my current-year total as well as all-time totals so I can quickly confirm residency or tax-related limits. Key requirements • Modern and sleek UI that feels consistent on iOS and Android. • Email-based user authentication so my data is private and can sync across devices. • Local persistence with secure cloud backup (Firebase, Supabase, or a comparable solution—open to your recommendation). • Basic filtering (by year, custom date range) and an option to export my date log as CSV or PDF. Nice-to-haves (if feasible within scope) • Push reminders when I’m approaching a predefined day limit. • Quick import from calendar or .ics file. • Dark mode that matches system settings. I’m flexible on tech stack, but React Native or Flutter make the most sense to keep one codebase. Hand-off will include full source code, brief setup documentation, and a TestFlight / APK build so I can verify everything before final sign-off. If this sounds like a build you can confidently deliver, let me know your proposed timeline, tech choice, and any similar apps you’ve shipped.