Sheriff Y.
Senior Mobile App Developer | React Native Specialist
📱✨ With over 5 years of experience developing and deploying high-quality mobile applications across various app stores, I specialize in creating enterprise-level React Native solutions that combine performance, scalability, and exceptional user experience. **CORE STRENGTHS** 💪 • 🚀 Rapid learning and adaptation to new technologies • 🧩 Problem-solving complex technical challenges • 🏗️ Building scalable, enterprise-grade applications • 🔄 End-to-end mobile application development lifecycle management • ⚡ Performance optimization for smooth user experiences • 📱 Cross-platform development expertise • 🧱 Component-based architecture design **TECHNICAL EXPERTISE** 🛠️ *React Native Development* 📱 • 🔄 State Management: Zustand, Redux, MobX, Context API • 🧭 Navigation: React Navigation (Stack, Bottom Tabs, Drawer), React Native Navigation • 🎨 UI Frameworks: NativeBase, React Paper, UI Kitten, Tailwind React Native • 🔌 API Integration: - REST: Axios, Fetch API - GraphQL: Apollo Client, URQL - WebSockets for real-time applications • 📝 Form Management: React Hook Form, Formik, Yup validation • 🛠️ Development Environment: Expo (managed and bare workflows), React Native CLI • 🧪 Testing: Jest, React Native Testing Library, Detox for E2E testing • 🔒 Authentication: OAuth2, JWT, Social logins, Biometric authentication • 💾 Data Persistence: AsyncStorage, MMKV, Realm, SQLite • 🗺️ Maps & Location: React Native Maps, Geolocation services • 🔔 Notifications: Push notifications (Firebase, OneSignal) • 📊 Analytics: Firebase Analytics, Amplitude, Mixpanel integration • 📈 Performance Monitoring: Flipper, React Native Performance, Hermes engine optimization *Development Workflow* ⚙️ • 🔄 CI/CD: GitHub Actions, Bitbucket Pipelines, App Center • ✅ Code Quality: ESLint, Prettier, TypeScript • 🚀 App Deployment: Google Play Store and Apple App Store submission processes • 📂 Version Control: Git, GitHub, Bitbucket with branching strategies *Design & Collaboration* 🎨 • 🖌️ UI/UX Tools: Figma, Sketch • 📋 Project Management: Jira, Trello, Asana • 📚 Documentation: Storybook, JSDoc **DEVELOPMENT APPROACH** 🧠 I follow industry best practices including: • ✨ Clean, maintainable, and well-documented code • 🧩 Component-based architecture • 📱 Responsive design principles • ♿ Accessibility compliance • 🔐 Security best practices • 👀 Regular code reviews and testing **CLIENT COLLABORATION** 🤝 I understand the importance of finding the right developer for your project. My approach emphasizes: • 💬 Clear and timely communication • 🔍 Transparent development processes • 📊 Regular progress updates • 🧠 Collaborative problem-solving • 🌱 Adaptability to changing requirements I welcome the opportunity to discuss your requirements and address any questions you may have through a call or message. My goal is to deliver exceptional value and help bring your vision to life with a focus on quality, performance, and user satisfaction. 🚀
Earnings and projects
Last 6 months ÷ 6
Last 6 months: $15k
Billed in all: $147,130$147k
$15k in the last 6 months
Across 11 contracts
Earnings, last 30 days
Skill rankings: Top 4% in Dart
Ranked by MRR among everyone on Upwork with the skill.
- #57Expo.io581 freelancers · 🇳🇬 #1Top 10%🇳🇬#1 of 14
- #103Dart2,324 freelancers · 🇳🇬 #2Top 4%🇳🇬#2 of 48
- #211Mobile App3,535 freelancers · 🇳🇬 #2Top 6%🇳🇬#2 of 84
- #213GraphQL3,404 freelancers · 🇳🇬 #3Top 6%🇳🇬#3 of 44
- #427iOS Development6,533 freelancers · 🇳🇬 #3Top 7%🇳🇬#3 of 90
- #553Mobile App Development8,511 freelancers · 🇳🇬 #5Top 6%🇳🇬#5 of 174
- #661React Native10,486 freelancers · 🇳🇬 #8Top 6%🇳🇬#8 of 179
- #1,161TypeScript15,967 freelancers · 🇳🇬 #8Top 7%🇳🇬#8 of 336