Cross-Platform Service App Development

I'm seeking an experienced mobile app developer to create a service-oriented application for both iOS and Android platforms. The app's primary function is to facilitate service delivery, and it will incorporate GPS tracking as a key feature.

Key Requirements:
- Cross-platform compatibility for iOS and Android
- GPS tracking functionality

Ideal Skills and Experience:
- Proven experience in developing mobile apps for both iOS and Android
- Expertise in integrating GPS tracking features
- Strong understanding of user interface and user experience (UI/UX) design
- Ability to work within budget constraints

If you have a portfolio showcasing similar projects and can ensure timely delivery, please submit your proposal.