**Description:**

We're seeking an full-stack developer to improve and complete an existing Calendar application. The project involves fixing current implementation issues and adding new features to match our reference web application.

Required Skills:

- React Native/React.js
- TypeScript (Deno)
- Firebase Authentication & Database
- Google/Apple Sign-In integration
- Docker containerization
- iOS/Android deployment
- Google Sheets API integration

**Project Scope:**

1. Technical Assessment & Fixes:
- Review existing codebase
- Debug and fix current implementation issues
- Implement missing functionality
- Ensure cross-platform compatibility
1. **Authentication Enhancement:**
- Google Sign-In integration
- Apple Sign-In for iOS
- Firebase user data management
- User state persistence
1. **Core Features Implementation:**

Calendar features & reference implementation are provided to a candidate upon request. Calendar features are already fully functional in our existing web-app.

2. **Multilingual System:**
- Implementation of translation management via Google Sheets
- Support for 3 languages (expandable)
- Persistent language preferences
1. **Deployment:**
- Web application deployment
- iOS App Store deployment
- Google Play Store deployment

**Requirements:**

- Available for regular progress updates

Note: Selected candidate must sign an NDA before accessing project materials. All source code and implementation details are confidential.

**Additional Details:**

- Existing codebase and mockups will be provided