Covert Privacy App Development

I'm looking for an experienced mobile app developer to create a hidden app for personal privacy, available on both iOS and Android platforms. The primary functionality of this app will be secure file storage.

Key requirements include:
- The app must be completely hidden from the user interface and not easily detectable.
- It should provide secure file storage, ensuring data is encrypted and accessible only to authorized users.
- The app needs to be user-friendly, despite its hidden nature.
- Strong knowledge of both iOS and Android development is essential.
- Experience with encryption and secure data storage is highly preferred.

Ideal candidates will have:
- Proven track record in developing secure, privacy-focused applications.
- Familiarity with app store guidelines to ensure the app can be deployed without issues.
- Strong problem-solving skills and attention to detail.

Please provide examples of similar work done in your bids.