Time Share App Development for iOS & Android

I am seeking a seasoned mobile app developer with a strong portfolio in creating cross-platform applications, particularly in the time share domain. The app's key features include a comprehensive booking system, detailed user profiles, a secure payment system, and a straightforward email/password authentication for user login.

Key Features:
- A robust booking system for seamless reservation of time slots.
- Comprehensive user profiles for tracking bookings, preferences, and history.
- A secure payment processing system for smooth and safe transactions.
- User Authentication through a simple email and password system.

Your Role:
- To propose a detailed project plan outlining how you will deliver this application.
- To develop a user-friendly, intuitive interface.
- To ensure the app is secure and protects user data.

Ideal Skills:
- Proven experience in mobile app development for both iOS and Android.
- Strong expertise in implementing booking systems and creating user profiles.
- Extensive experience in integrating secure payment systems.
- Exceptional skills in ensuring app security and data protection.

Please include a detailed project proposal in your application as well as your estimated timeline for completion. I need this project delivered ASAP.