Ring App — High-performance spam call filtering system

I participated in the development and growth of PingOcean's key product — Ring App (an application for identifying and blocking spam calls and combating fraud). The app has been launched in the international market. My key tasks and achievements include: Developed a high-performance incoming call filtering system based on dynamically updated spam number lists. Implemented algorithms for detecting test calls, helping to identify fraudulent schemes on the side of telecom operators. Designed local data processing without collecting personal user information — strict compliance with Google Play privacy standards. Developed a reward system (gamification) for completing user tasks, which significantly increased app retention. Responsible for full-cycle publishing of updates, A/B testing, and technical support in Google Play Console. The project provided me with excellent experience working with high-load real-time systems, security, privacy, and retention mechanics. Key skills and categories (for the form): Kotlin, Android SDK, Jetpack Compose / XML, Coroutines, Security Architecture, Call Filtering, Working with Telephony API, Privacy and Compliance (GDPR/Google Play), Gamification and Retention, A/B Testing, Google Play Console, Full Release Cycle.