How I Built a Privacy-First Android Notification Mirroring App in React Native

Short summary

Developer shares the architecture of Pairio, a privacy-first Android notification mirroring app built entirely in React Native. The solution uses E2E encryption, smart package filtering, a 6-digit pairing mechanism, and foreground services to prevent battery optimizations. The post demonstrates React Native patterns for real-time, background-heavy, privacy-critical applications and compares technical approach against competitor Same Notification.

• •Pairio uses end-to-end encryption with zero data retention to securely mirror notifications between Android devices
• •NotificationListenerService, foreground services, and wakelocks work together to survive Android's aggressive battery optimizations and OEM killswitch behavior
• •React Native enabled rapid development of a complex real-time app requiring only one native Android module; author explains technical tradeoffs versus building entirely in Kotlin

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