Comprehensive Multi-Platform Booking, Market Place & Job Ecosystem

I'm looking for a full-fledged, modern, and scalable ecosystem that integrates a Booking & Scheduling System, a Marketplace, and a Job Portal. This system should be compatible across Web, iOS, and Android platforms.

Key Features:

- Centralized Booking & Scheduling: The core of this ecosystem. It should facilitate appointment booking, event scheduling, and class or group scheduling with utmost efficiency and user-friendliness.
- Comprehensive Marketplace: This should primarily feature service listings. It should provide a seamless integration with the booking and scheduling system, allowing users to book services effortlessly.
- Efficient Job Portal: This should also be integrated with the booking system, making it convenient for users to schedule interviews or job-related appointments.

The ideal candidate for this project should have:

- Extensive experience in developing multi-platform applications
- A strong background in creating scalable systems
- Knowledge and experience in AI integration
- Proven expertise in designing modern, user-friendly interfaces.

The system should be future-proofed for AI integration and capable of accommodating millions of users without compromising performance.