Restaurant Management and POS ready project i want to buy + Customization if you can

I'm looking to purchase a ready-made POS and Restaurant Management System that can be customised to fit my needs. This system should be accessible via a web app and cross-platform mobile apps (iOS and Android).

Key Requirements:
- Fully Functional POS
- Fully Function Reservations ( Booking Tables )
-Menu Management
- Price Management
- Multi-store under one Brand (Franchise model)
- High Tech Food Delivery Management
- Restaurant internal management - Like task allotment and assigning
- Sales tracking and fully functional Analytics reports
- Inventory management, Batching management, Stock in and Batching, Stock out on Invoice. Formula-based.
- Employee management, from hiring to firing.
- Customizable to fit various types of food-serving venues (fast food, fine dining, cafes, etc.)

Ideal Skills and Experience:
- Experience in developing or customising POS systems
- Strong background in web and mobile app development
- Familiarity with restaurant management needs and functionalities
- Ability to provide ongoing support and updates after customisation

Please share your previous work samples and how you plan to approach this project.

Note: Consideration of changes or new requirement at least 20%