Mobile App for Client Base Management

I’m looking for an experienced mobile app developer to create a client base management system. This system will help manage customer relationships, track subscriptions, and monitor purchase data efficiently.

Key Features:
- Contact Management: Store and track customer details and interactions.
- Customer Support Tracking: Log customer support requests and resolutions.
- Subscription Management: Monitor new subscriptions, renewals, and statuses.
- Purchase Data: Store and analyze customer purchase history.
- Notifications: Send automated alerts for renewals, promotions, and support updates.
- User Authentication: Secure login to protect customer data.
- Data Backup: Regular backups to prevent data loss.
- Reporting Tools: Generate business reports with standard templates.
- Payment Integration: Support transactions via payment gateways.
- Shop & Delivery Integration: Manage product purchases and deliveries.

Additional Details:
- Database: The app will use MongoDB for data storage.
- UI Design: Clean and simple interface with minimal customisation.
- Language Support: Notifications will be available in a single language.

Ideal candidates should have experience in mobile app development, client management systems, data analysis, and payment gateway integration.
Please share examples of similar projects you’ve worked on.