Hamza Zafar

- Architected zero-downtime OTA update pipelines using Hot Updater and EAS Update, enabling same-day production hotfixes and cutting average time-to-fix from days to under 2 hours. - Led full-lifecycle mobile engineering across multi-platform client projects, integrating strictly typed REST/GraphQL APIs with Zustand state persistence. - Built offline-first caching with MMKV and TanStack Query, reducing redundant API calls by ~40% across core user flows.

- Served as primary technical lead for an 8-engineer mobile team delivering 20+ production React Native applications across booking, retail, and service domains. - Engineered a modular, typed UI component library and API client package shared across mobile apps and web admin portals, reducing feature delivery cycles by ~30%. - Automated CI/CD pipelines with GitHub Actions and EAS Build while enforcing test suites (Jest, React Native Testing Library, Detox), reducing release regressions by ~45%.

- Architected end-to-end mobile applications using Firebase as a full serverless backend (Firestore, Realtime Database, Cloud Functions, and Authentication). - Implemented real-time data sync, secure JWT session persistence with automated token refresh, and offline data persistence across core client workflows. - Configured Firebase Cloud Messaging (FCM) for targeted push campaigns, dynamic deep-linking, and automated transactional user alerts.

- Advanced from Mobile Engineering Intern to full-time React Native Developer, shipping 10+ cross-platform apps to the App Store and Google Play with a 4.6+ average user rating. - Authored custom native Java and Objective-C module bridges exposing hardware camera access, biometrics, and background geolocation APIs. - Engineered modular TypeScript UI primitives and handled REST API integrations for real-time application features.