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Julien GuibertJG

Julien Guibert

Dev App Android/iOS/Web/PWA - FlutterFlow Expert ✨

€650/day
Paris, FR
15+ years

Average response time: 1 hour

Freelancer profile translated to English.
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About Julien

🚀 Fullstack Developer | FlutterFlow, Firebase & PWA Expert

With over 15 years of experience, I support companies, startups, and individuals in creating innovative web and mobile solutions.
Specializing in FlutterFlow, Firebase, and Progressive Web Apps, I help you transform your ideas into concrete and high-performing solutions.

🔹 What I offer:
✔ Development of cross-platform applications (Web, Android, iOS)
✔ Creation of POCs or MVPs to quickly test your ideas on the market
✔ Optimization and support on FlutterFlow, including pushing the tool's limits

🔥 FlutterFlow, Firebase & GCP Expert

🛠 Advanced FlutterFlow & Flutter Development
✔ Creation of Custom Widgets and advanced Widgets (animations, complex interactions, optimized performance)
✔ Code sharing with FlutterFlow Libraries
✔ Design of modern interfaces with Material Design for a fluid and coherent user experience

☁ Back-end & Hosting with Firebase
✔ Firebase Authentication (Email, Google, Apple, OTP…)
✔ Firebase Firestore & Realtime Database (efficient data management)
✔ Firebase Storage (secure hosting of files and media)
✔ Firebase Hosting (fast and optimized hosting)
✔ Firebase Cloud Messaging (push notifications and real-time messaging)
✔ Deployment on FlutterFlow, Firebase Hosting, or Vercel

🔗 Advanced Integrations
✔ Connection to Google APIs (Maps, Places, Routes…)
✔ AI Integration with OpenAI, GeminiAI, ClaudeAI, etc.

⚡ Prototyping & MVP
✔ Development of an MVP in PWA to quickly test your product on the market

🔄 Code Management & Automated Deployment
✔ Versioning and hosting of source code on GitHub
✔ Automated deployment with GitHub Actions (CI/CD) on Firebase Hosting

📩 Have a project in mind? Contact me today and let's bring it to life together! 🚀
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km)

Experience

  • Plateforme VTC
    Complete VTC Platform: Android/iOS/PWA Apps and Custom Web Back-office
    TRANSPORTATION
    January 2025 - Today (1 year and 5 months)
    Paris, France
    This project in development aims to facilitate the connection between VTC drivers and passengers, without intermediaries. The goal is to offer a simple and efficient experience, where passengers can easily book a ride and drivers can manage their trips autonomously.

    🔹 Passenger App: Search and book rides in a few clicks.
    🔹 Driver App: Manage rides and availability.
    🔹 Admin Interface: Supervise and manage trips.

    Currently in the development phase, the platform is evolving with a focus on transparency and optimizing the user experience.

    💡 Technologies: FlutterFlow, Firebase, OneSignal (notifications), FCM (Push), PWA.
    Flutterflow Google Routes API Firebase Firestore OpenAI VTC
  • ShootPark
    ShootPark – Shooting Training Application (FlutterFlow & Firebase)
    ENTERTAINMENT AND LEISURE
    April 2024 - September 2025 (1 year and 4 months)
    Paris, France
    Project Description:
    ShootPark is a mobile and web application for sports and professional shooters. It transforms a standard practice session into an interactive and motivating experience through automatic shot detection and a real-time challenge system.

    Project Objectives:
    🔹 Real-time shot detection via audio processing
    🔹 Text To Speech (TTS)
    🔹 Interactive challenges and gamified training
    🔹 Performance tracking and progress statistics
    🔹 Multi-platform deployment (Android, iOS, Web/PWA)
    🔹 Modern architecture with FlutterFlow + Firebase

    Added Value:
    An innovative tool that modernizes shooting training, improves user accuracy and responsiveness, while making each session unique and engaging.
    Flutterflow Flutter Firebase Google Cloud Platform (GCP)
  • ImoSmartchain
    Project Builder - 🏡 Real Estate Platform
    REAL ESTATE
    March 2024 - April 2025 (1 year)
    Paris, France
    This project aims to facilitate real estate valuation through the integration of advanced technologies.

    🔹 Integration of OpenAI (ChatGPT)
    🔹 Use of Google Maps for interactive property visualization.
    🔹 Connection to several cadastral APIs to retrieve official data and enrich valuations.
    🔹 Optimization of user experience through a fluid and intuitive interface.

    The project is evolving with a focus on simplicity, accessibility, and efficiency.

    💡 Technologies used: OpenAI, Google Maps, Cadastre API, FlutterFlow, Firebase.
    API Integration Flutterflow Google Maps API Real Estate Flutter

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Education

  • Master 2 MIAGE
    University of Orléans
    2006
  • DUT Computer Science, Computer Engineering Option
    University of Orléans
    2003

Certifications

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