Cross-Platform App Development (Flutter, FlutterFlow, KMP)Julien .J
Ship your app on iOS, Android, and Web — from a single codebase.
Former native Android engineer turned cross-platform specialist. I build production-ready mobile apps, web apps, and MVPs using Flutter, FlutterFlow, and Kotlin Multiplatform (KMP).
Whether you need a polished MVP to validate product-market fit, a full SaaS application, or a complex business tool — I deliver pixel-perfect, scalable apps in record time.
Why work with me?
60% faster delivery using FlutterFlow for rapid prototyping without sacrificing code quality
Native-grade performance on every platform (iOS, Android, Web, Desktop)
Product-first mindset — I think about your users, not just your codebase
Clean, documented architecture ready for your team to scale
Tech stack
Flutter & Dart, FlutterFlow (certified expert), Kotlin Multiplatform, Firebase (Firestore, Functions), Supabase, PostgreSQL, Stripe, RevenueCat, Algolia, REST APIs, AI integrations (OpenAI, Claude, Gemini).
FAQs
Starting at$50 /hr
Duration4 weeks
Tags
Dart
Firebase
Flutter
FlutterFlow
Supabase
Mobile Engineer
Cross-Platform
Kotlin Multiplatform
Service provided by
Julien .J Paris, France
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- Followers
Cross-Platform App Development (Flutter, FlutterFlow, KMP)Julien .J
Starting at$50 /hr
Duration4 weeks
Tags
Dart
Firebase
Flutter
FlutterFlow
Supabase
Mobile Engineer
Cross-Platform
Kotlin Multiplatform
Ship your app on iOS, Android, and Web — from a single codebase.
Former native Android engineer turned cross-platform specialist. I build production-ready mobile apps, web apps, and MVPs using Flutter, FlutterFlow, and Kotlin Multiplatform (KMP).
Whether you need a polished MVP to validate product-market fit, a full SaaS application, or a complex business tool — I deliver pixel-perfect, scalable apps in record time.
Why work with me?
60% faster delivery using FlutterFlow for rapid prototyping without sacrificing code quality
Native-grade performance on every platform (iOS, Android, Web, Desktop)
Product-first mindset — I think about your users, not just your codebase
Clean, documented architecture ready for your team to scale
Tech stack
Flutter & Dart, FlutterFlow (certified expert), Kotlin Multiplatform, Firebase (Firestore, Functions), Supabase, PostgreSQL, Stripe, RevenueCat, Algolia, REST APIs, AI integrations (OpenAI, Claude, Gemini).
FAQs
$50 /hr