Freelancer profile translated to English.
Back to original languageAbout Julien
Hello, I'm Julien, a mobile developer specializing in Flutter, Kotlin, and Kotlin Multiplatform (KMP).
I help startups, SMEs, and project owners create modern, high-performing, and maintainable mobile applications, from idea to store publication.
What I can handle
- Flutter iOS & Android app development
- Kotlin Multiplatform (KMP/KMM)
- Scalable mobile architecture
- Firebase / Supabase backend
- Fast and solid startup MVPs
- Redesign or optimization of existing applications
- App Store & Google Play publication
- Payments and subscriptions (Stripe / RevenueCat)
- APIs, generative AI, and automations
- Real-time, push notifications, geolocation
- Mobile UX performance and optimization
My approach
I don't just "code an app".
My goal is to build a technically viable and business-coherent mobile product:
- Clean and maintainable architecture
- Rapid development
- Fluid user experience
- Controlled technical debt
- Preparation for scaling
I am used to working in startup environments with strong time, budget, and product iteration constraints.
Main Stack
Mobile
- Flutter
- Dart
- Kotlin
- Kotlin Multiplatform
- Native Android
Backend & Cloud
- Firebase
- Supabase
- Cloud Functions
- REST APIs
- PostgreSQL
Architecture & Tools
- Riverpod
- Clean Architecture
- Git
- CI/CD
- RevenueCat
- Stripe
- Figma
Why work with me
- Product and business vision
- Clear and fast communication
- High autonomy
- Architecture designed for the long term
- Ability to ship quickly without sacrificing quality
Available for:
- MVPs
- Mobile team augmentation
- Technical audits
- Application redesign
- Mobile CTO support
- Long-term missions
Feel free to contact me to discuss your project.
French
Native or bilingual
English
Conversational
Can work on-site
Lille (up to 50km), Paris (up to 50km), Dunkerque (up to 50km)
Experience
- Alph4CorporationsFreelanceTECHJanuary 2023 - Today (3 years and 5 months)For over two years, I have been assisting startups and companies in developing mobile and web applications, combining performance, design, and optimal user experience.I have had the opportunity to work on a wide variety of projects, from native applications (Kotlin for Android) to cross-platform solutions with Flutter and FlutterFlow.My expertise also covers the integration and management of backends with Firebase, ensuring scalable and secure applications.Whether for development from scratch, improving an existing application, or specific integration, I put my skills to use for high-performing solutions adapted to client needs.
- LINKIZZMobile DeveloperEDUCATION AND E-LEARNINGSeptember 2022 - December 2022 (4 months)
- Development of a new app with Jetpack Compose. (Kidizz Daily)
- Maintenance and improvement of the main application (Kidizz)
- EfipeekMobile DeveloperSOFTWARE PUBLISHINGMarch 2022 - August 2022 (5 months)Croix, France
- Maintenance in operational condition (TMA) of client applications
- Development from scratch
Recommendations
JJ
+1
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Education
- Application Developer - AndroidOpenClassrooms2022Le dĂ©veloppeur dâapplication Android est un expert en dĂ©veloppement mobile, spĂ©cialisĂ© sur Android. Il est responsable de la crĂ©ation, du dĂ©veloppement et de la maintenance d'applications mobiles pour les smartphones et tablettes Android. Le dĂ©veloppeur dâapplication Android travaille sur l'interface utilisateur, les fonctionnalitĂ©s, et veille Ă ce que l'application soit performante et sĂ©curisĂ©e.
- Computer Science TechniquesCegep Alma2019DĂ©velopper et concevoir des applications de la programmation jusquâĂ lâinterface, de leur architecture Ă leur ergonomie.