Mobile App Developer (Convert Existing Base44 Web App Into iOS + Android App)

Budget: $2,500–$5,000 USDProject Type: Fixed PriceTimeline: 4–6 weeksLooking For:Senior Mobile App Developer (Flutter / React Native / Capacitor) with experience converting web apps into full mobile apps and integrating Health APIs. PROJECT OVERVIEWI have an existing web application built on Base44, which includes:• A fully designed and functional front-end UI• User authentication• AI-driven logic (based on body type, BMI, blood type, etc.)• Database already set up• Smooth, fluid, modern user experienceThe web version is clean, fast, responsive, and production-ready.WHAT I NEED BUILTI need this web application converted into a mobile app that is:• Published in the Apple App Store (iOS)• Published in the Google Play Store (Android)• Retains the same UI/UX quality• Fluid, user-friendly, modern• Uses my existing backend + Base44 APIs• Structured for future integrations (wearables + offline-first)This is Phase 1 of the project. Future phases will expand functionality, but Phase 1 MUST be polished and professional. SCOPE OF WORK (PHASE 1)1. Mobile App Build• Convert my existing Base44 web application into a downloadable mobile app• Framework can be Flutter, React Native, or Capacitor (developer may choose)• App must:• Load my Base44 screens• Maintain all UI animations and flow• Support portrait mobile design• Load fast and feel native2.Native Mobile FeaturesInclude inPhase 1:• Splash screen• App icon + branding• Navigation transitions• Smooth screen rendering• Basic local caching (recent screens load even with poor connection)• Deep linking setup• Analytics setup (basic)NOT included in Phase 1 (but must be architected for Phase 2):• Full offline-first sync engine• Deep wearable integrations (Apple Watch app, Fitbit app, sleep tracking, etc.)3. Light Wearable Integration (Phase 1 – Optional “Basic Sync”)If the budget allows, include:• Apple HealthKit basic read permissions• Steps• Active energy• Resting heart rate• Google Fit basic read permissions(same metrics as above)→The developer must map these values to my Base44 backend through secure API calls.No advanced wearable features needed yet. 4. Backend IntegrationThe app must connect to:• Base44 authentication• Base44 API endpoints• Base44 database connections• AI recommendation endpoints (already built)No backend rebuild. No new database. No re-architecture. The developer only connects the mobile app to the existing system. 5. App Store + Play Store DeploymentDeveloper must handle:• App Store Connect setup• Google Play Console setup• Signing keys• Certificates• TestFlight• Play testing• App submission• Fixing Apple rejections if requiredI will supply:• Developer accounts• Branding assets• Screenshots and marketing copy for app listingsDELIVERABLESBy the end of Phase 1, I must receive:1.iOS App (TestFlight + ready for App Store submission)2. Android App (ready for Play Store submission)3. Full source code4. Documentation• How the app connects to Base44• How wearable sync is implemented (if included)• How to update builds in the future5. A fully functional mobile app that mirrors my existing Base44 UI6. A future-ready architecture to support:• Deep Apple Watch + Fitbit integrations• Offline-first capabilities• Advanced activity/wellness scoringREQUIRED EXPERIENCEOnly apply if you have proven experience in:• Converting web applications to mobile apps• Flutter, React Native, or Capacitor• Apple HealthKit / Google Fit integrations• API integrations• Offline caching systems• Publishing apps to Apple App Store + Google Play Store• Creating highly polished, fluid UI/UXPlease include:• Links to past apps you’ve built• Examples of web-to-app conversions• Experience with health/wellness apps• Your recommended tech stack and whyWHAT SUCCESS LOOKS LIKE• The app feels native, not like a cheap wrapper• UI is fluid, fast, modern, beautiful• App experience = same quality or better than current Base44 web app• Users can log in, view programs, track wellness, interact with AI• App is stable, polished, and ready for real clients• The architecture prepares us for deeper Phase 2 integrationsPAYMENT MILESTONESMilestone 1 (20%) — Project architecture + mock build• Developer shows app shell loading Base44 login screenMilestone 2 (40%) — Full app screens functional• Navigation + UI implemented• Backend connectedMilestone 3 (30%) — Wearable basic sync (if included)• Apple Health + Google Fit simple metrics integratedMilestone 4 (10%) — App Store + Play Store submission• Ready for publishing• Final QA + bug fixesNEXT STEPSPlease answer the following when applying:1.Which framework would you use (Flutter, React Native, Capacitor) and why? 2. Have you integrated Apple Health or Google Fit before? 3. How would you wrap my Base44 application into a mobile-native experience? 4. What challenges do you expect with App Store review? 5. Can you deliver within the $2.5K–$5K budget? 6. What is your estimated timeline? END OF JOB POST⸻ Apply tot his job