iOS & Android Productivity App

I’m building a full-featured productivity application that will run natively on both iOS and Android. The core of the project is a seamless workspace where users can:

• Organise tasks with due dates, priorities, and progress tracking
• View, create, and edit events through tight calendar integration
• Capture rich notes on the fly, attach files, and link them to tasks or events
• Reference an in-app contacts module so tasks and notes can be associated with people
• Keep data perfectly in sync across devices and the cloud
• Use voice input to add tasks, dictate notes, or search the workspace hands-free

Secure email-and-password authentication is required from the first screen, with encrypted storage of credentials and JWT-based session handling.

I need a polished, store-ready build on both platforms, complete source code, and brief technical documentation covering the data model, sync mechanism, and authentication flow. A short demo video or TestFlight/Play Store internal test upload will serve as final acceptance.