Cross-Platform Utility App Development

I'm seeking an experienced mobile app developer to create a utility app for both iOS and Android platforms. The app will require the following functionalities:

- Data synchronization
- Push notifications
- In-app purchases

Ideal Skills and Experience:
- Proven experience in developing cross-platform mobile apps
- Strong knowledge of data synchronization techniques
- Experience implementing push notifications and in-app purchase functionalities
- Familiarity with both iOS and Android development guidelines
- Ability to deliver a user-friendly and efficient app

Please provide examples of similar work done and a timeline for completion. Looking forward to your bids!