Cross-Platform Scheduling App Development

I need an experienced developer or team to build a scheduling app that works on iOS, Android, and the Web. The core feature of this app is calendar integration, and users should be able to register and log in using email and password.

Key Requirements:
- Calendar Integration: Seamless syncing with major calendars (Google Calendar, Apple Calendar, etc.)
- User Authentication: Registration and login via email and password
- Platforms: iOS, Android, and Web
- Tech Stack: React for frontend and Node.js for backend

Ideal Skills and Experience:
- Proficiency in React and Node.js
- Experience with calendar APIs and user authentication systems
- Strong background in developing cross-platform applications
- Familiarity with mobile app development for both iOS and Android

Please provide your portfolio and relevant experience in your bids. Looking forward to your proposals!