Multi-Platform Delivery App Development

I need an experienced mobile app developer to create a delivery application available on both iOS and Android platforms.

Key Features:
- Real-time tracking of deliveries
- In-app payment processing
- Customer review system

Ideal Skills & Experience:
- Proficiency in iOS and Android development
- Experience with real-time tracking integrations
- Secure in-app payment systems
- Customer review functionalities

Looking for a developer with a strong portfolio in similar projects. Please provide examples of your previous work.