Comprehensive Gym Management App Development

I need a robust gym management app that includes:

Core Features:
- Analytics & Reports (Membership trends, Revenue and financial, Class attendance)
- Billing & Payments
- Bookings & Classes
- CRM & Member Management
- Marketing & Retention
- Member App (Key features: Bookings & Classes, Billing & Payments, Member Experience)
- Sales & Online Joining
- POS & Inventory Management
- IOT Integration
- Access Control via Hikvision terminal and dynamic QR code
- Technogym Mywellness integration

Platform Compatibility: iOS, Android, Web

Ideal Skills and Experience:
- Experience in developing multi-platform applications
- Strong background in IoT integration
- Familiarity with Hikvision terminals and dynamic QR code systems
- Knowledge of Technogym Mywellness API
- Proficient in building comprehensive CRM and analytics systems
- Strong UI/UX design skills to enhance member experience

Please provide examples of similar work done.