Designing GDPR-Compliant Data Storage for iOS & Firebase Apps
A practical privacy engineering guide for European developers to ensure local device storage and Firebase backends comply fully with GDPR.
Fines up to 4% of global turnover for failing to secure personal user data.
Storing unencrypted PII (Personally Identifiable Information) in client logs or local files.
Lack of automated account and data deletion mechanisms.
Third-party analytics SDKs collecting user data without explicit consent.
Encrypting all local database stores using SQLCipher and Keychain AES-256 keys.
Implementing explicit App Tracking Transparency (ATT) and opt-in consent prompts.
Automated Firebase Cloud Functions handling complete account & data deletion requests (Right to be Forgotten).
Restricting database access through strict authenticated Firestore Security Rules.
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