App Developer for Logistics & Delivery

I'm looking for a proficient freelance app developer to create dual interfaces for my logistics and delivery company. The project involves both a user app and a driver app.

Key Features for User Interface:
- Real-time tracking: Users should be able to monitor their package's journey live.
- In-app messaging: A built-in chat system to facilitate communication.
- Payment integration: Seamless and secure payment processing within the app.
- Calling: Users should be able to contact the driver or support directly from the app.

Key Features for Driver Interface:
- Navigation assistance: Integration with maps and GPS for route optimization.
- Order management: Drivers should have a systematic way to handle their deliveries.
- Messaging: A communication system for drivers to connect with users and the base.
- Calling: Drivers should be able to call users or support as needed.

The ideal candidate will have:
- Extensive experience in building mobile applications for both iOS and Android.
- A strong portfolio particularly in the logistics or transportation sector.
- Skills in creating user-friendly and efficient interfaces.
- Knowledge of integrating real-time tracking, in-app messaging, and payment systems.

Please provide examples of previous work that align with this project.