Cross-Platform Mobile App Development

🎯 MY SERVICE I'm a Fullstack Developer with 4+ years of hands-on experience, Founder of 3K TechOne - a software development company in Vietnam. I specialize in building high-quality, cross-platform mobile applications for both iOS and Android using a single codebase. I've successfully delivered mobile apps including: Mental Health & Wellness platform, HR/Payroll employee app, E-commerce mobile app, and Booking system with real-time features. ━━━━━━━━━━━━━━━━━━━━━━━━ ✅ WHAT YOU'LL GET • Cross-platform App (iOS + Android) from single codebase • Modern, intuitive UI/UX following platform guidelines • Smooth animations & native-like performance • Push Notifications (Firebase Cloud Messaging) • User Authentication (Email, Google, Apple, Facebook) • Payment Integration (Stripe, PayPal, VNPay, MoMo...) • Real-time features (Chat, Live updates) • App Store & Play Store submission support • Clean, well-documented source code • 30-day post-delivery bug fix warranty ━━━━━━━━━━━━━━━━━━━━━━━━ 💻 TECHNOLOGIES I USE Mobile Development: • React Native (Expo / Bare workflow) • TypeScript • Redux / Zustand / Context API Backend & APIs: • Node.js / NestJS • Firebase (Auth, Firestore, Storage) • RESTful API / GraphQL • Socket.IO for real-time Database: • PostgreSQL / MySQL • MongoDB / Firebase Firestore • Redis for caching Services & Integrations: • Push Notifications (FCM, APNs) • Maps (Google Maps, MapBox) • Payment Gateways • Social Login & OAuth • Analytics (Firebase, Mixpanel) ━━━━━━━━━━━━━━━━━━━━━━━━ 📋 HOW I WORK 1️⃣ Discovery & Requirements → Understand your app idea, target users, and features 2️⃣ Proposal & Timeline → Clear pricing, milestones, and project roadmap 3️⃣ UI/UX Design → Wireframes → Figma Mockups → Your Approval 4️⃣ Development & Demo → Build feature by feature with TestFlight/APK demos 5️⃣ Testing & QA → Test on real devices, multiple OS versions 6️⃣ Store Submission → Prepare assets, submit to App Store & Play Store 7️⃣ Launch & Support → Monitor, fix issues, and provide maintenance ━━━━━━━━━━━━━━━━━━━━━━━━ 🏆 WHY CHOOSE ME? ✓ 4+ years building production mobile apps ✓ Software company founder - dedicated team support ✓ Experience with Japanese & international clients ✓ React Native expert - one codebase, two platforms ✓ Focus on performance & user experience ✓ Clear communication & weekly progress updates ✓ Committed to deadlines & quality delivery ━━━━━━━━━━━━━━━━━━━━━━━━ 📱 PERFECT FOR • Startup MVPs & app prototypes • E-commerce & marketplace apps • Social & community apps • Health & fitness apps • Booking & on-demand services • Enterprise internal apps ━━━━━━━━━━━━━━━━━━━━━━━━ 📞 LET'S TALK Send me a message to discuss your app idea. I typically respond within 2 hours!