Published and maintained Android apps on the Google Play Store, including Tropical Bank Mobile Banking, KCBU Mobi, KCB Agent. Owned the complete Android development lifecycle for banking applications used by 10,000+ users, maintaining a 4.6-star Play Store rating. Defined and applied MVVM and Clean Architecture, cutting defect rates by 30% and improving long-term code maintainability. Delivered essential banking functionality including fund transfers, QR payments, split payments, and chat-based transactions for users across Africa and India. Enabled in-app video KYC by integrating the Twilio Video SDK, reducing customer onboarding time by 40%. Strengthened application security through SSL pinning, Play Integrity API, and biometric authentication to protect sensitive banking data. Reduced production crash rates by 35% through performance tuning and continuous monitoring using Crashlytics and Android Profiler. Implemented real-time transaction and fraud notifications using Firebase Cloud Messaging (FCM) to keep users informed. Handled Google Play Store release operations, including versioning, crash analysis, and deployment coordination.