Cross-Platform Utility App Development

I am looking for a talented app developer to create a utility app for both iOS and Android. The app must include user authentication, data synchronization, and push notifications as core features.

Essential Skills:
- Proficiency in cross-platform app development
- Experience with creating utility apps
- Knowledge of implementing user authentication systems
- Skills in enabling data synchronization
- Expertise in integrating push notifications

Ideal candidates will have a portfolio showcasing their previous cross-platform utility apps.