Personal Goods Shipping App Development

I need a skilled app developer who can build and maintain an app called 'Sender'. This app is aimed to facilitate individuals in sending personal goods from one country to another. The platforms I need this app to be available for use on both iOS and Android.

Key Features Needed:
* Real-time tracking - This is crucial for users to track their goods in transit

Ideal Candidate:
A developer who has a proven track record of building apps for both iOS and Android platforms. Knowledge of geolocation-based services, like real-time tracking, is strongly preferred.