Zar S.

Stop dealing with buggy builds, battery-draining code, and performance bottlenecks. I help businesses scale mobile applications to millions of users, build high-performance Wear OS solutions, and solve complex engineering problems. With nearly a decade of experience, I don't just write code—I bridge the gap between complex business requirements and seamless user experiences, taking apps from conceptualization to global Play Store deployment. Proven Impact at Scale 1 Million+ Active Users: I develop and maintain high-traffic applications, consistently ensuring a 99.9% crash-free session rate through rigorous memory management and code optimization. Mission-Critical Problem Solving: When a client’s Twilio SMS API was compromised, I implemented an immediate fix via secure backend proxying, preventing service abuse instantly without interrupting the user experience. Specialized Wear OS & Hardware Expertise Building for wearables requires an entirely different engineering mindset. I specialize in maximizing performance on constrained hardware: Near-Zero ANR Rates: I design feature-rich applications for Wear OS optimized to prevent memory leaks and UI thread blocking. Hardware & Sensor Optimization: Experienced in smooth, low-latency performance for BLE tracking (AltBeacon), Google Maps route tracking, and real-time sensor data synchronization without draining battery life. Full-Stack Mobile Capabilities (Firebase Expert) I leverage the full Firebase Suite to build modern, data-driven, and highly secure applications: Real-Time Data & Auth: Seamless data syncing using Firestore and robust multi-method user logins with Firebase Auth. Growth & Retention: Driving user engagement via Cloud Messaging (Push Notifications) and utilizing Remote Config for instant feature toggles and dynamic A/B testing without waiting for app store approval. Proactive Monitoring: Keeping applications stable by utilizing Crashlytics and Performance Monitoring to catch and resolve bottlenecks before they ever impact your users. Core Technical Stack Languages: Kotlin (Expert), Java UI/UX Architecture: Jetpack Compose, XML, DataBinding, Material 3 Design Architecture & Patterns: Clean Architecture, MVVM, Hilt / Dagger 2, Coroutines & Asynchronous Flow IoT & Wearables: Wear OS, BLE (AltBeacon), WebSockets, Socket io Cloud & Backend Integration: Firebase (Firestore, Auth, Cloud Messaging, Remote Config, Crashlytics), Retrofit, REST APIs Ready to get your app to the next level or need a robust Wear OS solution?