I will develop mobile apps with API, firebase, payment, barcode and qr code integration

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dowwell_dev
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dowwell_dev
Stefan Wagner
develop mobile apps with API, firebase, payment, barcode and qr code integration
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develop mobile apps with API, firebase, payment, barcode and qr code integration

About this gig

Need a reliable mobile developer to build or expand your Android or iOS mobile app?


I will develop a functional, scalable mobile app qevelopment tailored to your business, startup, eCommerce or service needs.


What I Can Build:

  • Android & iOS mobile apps
  • Flutter / React Native apps
  • API & backend integration
  • Firebase authentication & database
  • Login, signup & user profiles
  • Payment & subscription integration
  • Barcode & QR code scanning
  • Product & inventory features
  • Push notifications
  • Google Maps & location features
  • Admin dashboard integration
  • Bug testing and app optimization


Tools & Technologies

  • Flutter
  • React Native
  • Dart
  • JavaScript
  • Firebase
  • REST API
  • Node.js
  • Android Studio
  • Xcode


You get clean development, responsive UI, functional integrations and testing before delivery.


Have an existing app or a new app idea? Send me your requirements and let's build it.

  • App type

    • Hybrid

  • Programming language

    • Dart
    • Java
    • JavaScript
    • Kotlin
    • Objective-C
    • PHP
    • Swift
    • TypeScript
    • React Native
    • Flutter

  • Frameworks

    • Flutter
    • Ionic
    • Laravel
    • Angular
    • SwiftUI
    • Node.js
    • React Native

  • Purpose

    • Chat
    • Dating
    • Delivery
    • Streaming
    • Restaurant
    • Medical
    • Health & fitness
    • Travel
    • Ecommerce
    • Real estate

  • Tools

    • Flutterflow
    • Android Studio
    • Unity
    • Xcode
    • Visual Studio Code
    • Visual Studio
    • Supabase

  • Expertise

    • Cross browser/Device compatibility
    • Localization
    • Performance
    • Design
    • Firebase
    • API integration

Get to know Stefan Wagner

Stefan Wagner

Google Ads Expert Suspension Fix Audit Local Business Meta Pixel

  • FromGermany
  • Member sinceMar 2026
  • Avg. response time1 hour

  • Languages

    English, German, Dutch, French, Hebrew
I'm a Google Ads Specialist helping businesses grow through Google Ads Suspension Fix, Google Ads Audit & Optimization, Google Ads Local Business Campaigns, and Facebook Pixel Conversion Tracking. I provide policy-compliant solutions that improve ad performance, recover suspended accounts, and maximize conversions. My focus is on quality, fast communication, and reliable results. Contact me before ordering to discuss your project and let's build a strategy that helps your business grow with Google Ads.

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