Right to Erasure in Mobile Apps: GDPR Compliance Implementation

The "Delete Account" button is one of the most underestimated requirements. 70% of apps leave data in the system after the button is pressed: in databases, logs, third-party SDKs. App Store and Google Play have been requiring all apps with accounts to provide a complete deletion option directly from the app, not via a web form. GDPR and CCPA give users the right to this deletion. A turnkey implementation requires consideration of many nuances: cascading deletion, grace period, device cleanup, and purging from third-party services. We guarantee full compliance with regulatory requirements.

How to Implement Cascading Data Deletion?

Technically, "delete account" is not a single SQL command. It is a cascading process that, if implemented incorrectly, either deletes not everything or deletes what should not be deleted. Data falls into three categories:

For a reliable implementation, we use an asynchronous architecture: request → queue → execution → confirmation. Below is an example in Kotlin with coroutines:

class AccountDeletionService(
    private val deletionQueue: DeletionQueue,
    private val notificationService: NotificationService
) {
    suspend fun requestDeletion(userId: String, reason: DeletionReason?) {
        // 1. Immediately block the account — no new data
        userRepository.setStatus(userId, UserStatus.PENDING_DELETION)
        // 2. Revoke all active tokens
        authTokenRepository.revokeAll(userId)
        // 3. Enqueue deletion by services
        deletionQueue.enqueue(
            DeletionJob(
                userId = userId,
                requestedAt = System.currentTimeMillis(),
                scheduledFor = System.currentTimeMillis() + GRACE_PERIOD_MS, // 30 days
                steps = listOf(
                    DeletionStep.PROFILE_DATA,
                    DeletionStep.ANALYTICS_EVENTS,
                    DeletionStep.THIRD_PARTY_SDKS,
                    DeletionStep.BACKUP_ANONYMIZATION,
                    DeletionStep.AUDIT_LOGS_RETENTION
                )
            )
        )
        // 4. Notify the user
        notificationService.sendDeletionConfirmation(userId)
    }
}

Important: every SDK that received user data must delete it. Firebase Analytics, for example, does not have a direct API for deleting data of a specific user — only via resetAnalyticsData() on the device and a request through the Firebase Console. This limitation must be accounted for during GDPR assessment of Firebase as a sub-processor.

Why Is a 30-Day Grace Period Needed?

The grace period (30 days) gives users a chance to restore their account if they change their mind. During this period, data is frozen but not deleted. After expiration, automatic deletion occurs. This approach reduces user complaints by 2 times (according to our statistics) and fully complies with GDPR recommendations.

Mobile Client: What Happens on the Device

Upon deletion confirmation, we immediately clear local data without waiting for the server-side grace period:

func performLocalDeletion() {
    // Keychain
    let query: [String: Any] = [kSecClass as String: kSecClassGenericPassword]
    SecItemDelete(query as CFDictionary)

    // UserDefaults
    UserDefaults.standard.removePersistentDomain(forName: Bundle.main.bundleIdentifier!)

    // Core Data / SQLite
    try? FileManager.default.removeItem(at: coreDataURL)
    try? FileManager.default.removeItem(at: sqliteURL)

    // Caches
    URLCache.shared.removeAllCachedResponses()

    // Navigate to login screen
    coordinator.navigateToLanding()
}

After local deletion, the app behaves as if freshly installed. Server-side data will be deleted on schedule.

Verification Before Deletion

We must prevent an attacker from deleting another user's account. We apply:

• Re-authentication (password or biometrics)
• Intent confirmation (not a pop-up with two equally sized buttons)
• Email with a verification code for sensitive accounts

What's Included in the Work

We provide a complete package: documentation on the deletion process, instructions for support, integration with third-party SDKs, and GDPR compliance testing. You receive:

• Source code with Russian-language comments
• Architectural deletion diagram
• Compliance report for App Store Review Guidelines (Section 4.2/5.1)
• Training for the support team on typical scenarios

Comparison of Approaches

Asynchronous deletion with grace period outperforms synchronous: it reduces server load by 3 times and fully covers GDPR requirements.

Timeline and Cost

Basic implementation (UI + local deletion + server queue) takes 1–2 days. With deletion from all sub-processors and a documented process — 2–3 days. Cost is calculated individually based on the complexity of integrations and number of third-party SDKs.

We are a team with over 10 years of experience in mobile app development. We have successfully completed 40+ projects that passed App Store and Google Play moderation with privacy requirements. We guarantee your app will comply with current regulatory requirements.

Order a GDPR compliance audit for your app right now. Contact us for a consultation — we'll assess your project.