Cross-Platform Utility App Development

I'm looking for an experienced app developer to create a utility/tool app for both iOS and Android.

Key Features:
- User Authentication: The app will need a secure login system.
- Taking Pictures: The primary use of the app will be for users to take pictures.
- Cloud Storage: The app should seamlessly save these pictures on the cloud for contractors to access.
- Offline Mode: Users should be able to take pictures and use the app without an internet connection.

Ideal skills for this job:
- Proficient in cross-platform app development (preferably using React Native or Flutter).
- Extensive experience in developing utility/tool apps.
- Proven track record of implementing secure user authentication systems.
- Familiarity with integrating cloud storage solutions within apps.
- Ability to design an app that is fully functional in offline mode.