Cross-Platform Productivity App Development

I need a back end to help build my app. I have detailed plans for the design / functionality.

I’m creating a mobile productivity tool that must feel truly native on both iOS and Android. The core feature is intelligent task management, backed by an AI layer that can prioritise to-dos, suggest due dates, and trigger smart reminders. Calendar or note support may come later, but first I want the task flow and AI logic nailed down.

I’ll need you to cover everything from UX wireframes through to App Store / Google Play submission. React Native, Flutter, or full-native Swift + Kotlin are all fine so long as performance stays slick and the UI follows each platform’s design conventions.

When you reply, please outline:
• The tech stack you recommend and why
• How you plan to embed on-device or cloud AI (Core ML, TensorFlow Lite, etc.)
• A rough milestone schedule—from clickable prototype to final release
• Links to any productivity apps you’ve shipped before

Deliverables
• Full source code in a private Git repo
• Release-ready .ipa and .aab builds
• Brief setup & architecture documentation

Clean, well-commented code and clear communication are a must. If this sounds like your wheelhouse, I’m ready to get started.