Hamza Dev

Senior Mobile Engineer

TechSea

Mar 2025 - Present • 1 yr 7 mos

• 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. • Profiled Hermes JS engine and optimized Reanimated UI threads to sustain consistent 60 FPS on mid-tier Android devices, reducing frame drops by ~70% on critical screens. • Built offline-first caching with MMKV and TanStack Query, reducing redundant API calls by ~40% across core user flows. • Established unit and component testing standards with Jest and React Native Testing Library, increasing test coverage from near-zero to ~65% on core modules.

Lead Mobile Engineer

D12 Solutions

Jan 2023 - Feb 2025 • 2 yrs 1 mo

• Served as primary technical lead for an 8-engineer mobile team delivering 20+ production React Native applications across booking, retail, and service domains (combined 50k+ downloads). • 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%. • Refactored media-heavy screens using FlashList, memoization, and lazy loading, eliminating most frame drops and lowering time-to-interactive by ~35%. • 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%. • Mentored junior engineers on software architecture, performance profiling, and testing practices while conducting rigorous code reviews to enforce best practices

React Native Developer

Teknovation

Jul 2022 - Jan 2023 • 6 mos

• 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.