Freelancer profile translated to English.
Back to original languageAbout Julien
With over 8 years of experience in **Android Mobile Development**, I specialized in 2019 in the Kotlin language and in 2022 in **Jetpack Compose**, which is the future of Android.
I have developed several applications from the idea to publication on the Google Play Store, including the development phase itself! I have created Mobile Applications in very diverse fields, from gardening to banking, not to mention beer brewing.
What I offer:
👉 Development of yourAndroid Kotlinapplication
👉 Migration of your application toJetpack Compose
👉 Maintenance of your native Android mobile application
👉 Bug fixing
👉 Technical guidance on Android
👉 Improvement of your applications (adding features, ...)
👉Optimizationof your Android applications
I have acquired solid experience in the design, development, and maintenance of mobile applications for Android operating systems. I code with Kotlin, the primary programming language for Android application development, as well as with Android development tools like Android Studio.
You can discover my applications on the Google Play Store:
🪴Garden Organizer: bit.ly/3jAKQnM
🍺Floaty hydrometer: bit.ly/3JJ6ErN
I look forward to discovering your project so I can create your Android application!
French
Native or bilingual
English
Fluent
Spanish
Conversational
Remote only
Primarily works remotely
Experience
- MyTravelBillKMP (IOS & Android) Developer, Spring Boot BackendTRAVEL AND TOURISMAugust 2025 - December 2025 (4 months)Toulouse, FranceMyTravelBill simplifies financial management for travel groups. My mission was to design a modern and scalable architecture using Kotlin Multiplatform (KMP) to share business logic between iOS and Android, while developing a robust backend with Spring Boot.Tasks & Achievements- Kotlin Multiplatform (KMP) Architecture: Design and implementation of the shared module including business logic, API calls (Ktor), and data persistence (Room).- Shared UI in Compose Multiplatform- Backend & API: Development of a secure REST API with Spring Boot (Kotlin), MongoDB database management, and JWT authentication implementation.- Real-time Synchronization: Implementation of offline-first synchronization mechanisms to allow expense entry in areas with no connectivity (airplane, mountains) with automatic reconciliation.
- LocaShiftAndroid Developer - Jetpack Compose - KotlinSOFTWARE PUBLISHINGApril 2024 - June 2024 (2 months)Toulouse, FranceCreation of the application from scratch with publication on the Google Play Store.Application in Kotlin and Jetpack Compose on Android.This application allows simulating a fake GPS position for the phone, enabling testing of other applications that require geolocation features.Development of the application from A to Z:- Architecture setup (MVVM)- Design in Jetpack Compose- Map display with Google Map Compose- Application development in Kotlin on Android- Use of Google's Place SDK- Setup of a Foreground Service to change GPS position- Setup of Room for local database- Dependency injection with Hilt- RevenueCat for subscriptions on the Google Play Store AndroidApplication:
- WiseBuildingLead Android Kotlin DeveloperREAL ESTATEJanuary 2024 - Today (2 years and 7 months)Paris, FranceWise Building is a centralized platform (SaaS) for controlling smart building services and equipment. As the Head of Android Development, my mission is to design and maintain a robust core framework, capable of being deployed across dozens of building-specific applications (White-labeling).Tasks & Achievements- Design of a shared architecture: Implementation of a modular project structure allowing code sharing between different buildings while enabling extensive customization (UI/UX, specific features).- Kotlin First Development: Migration and development of new features in Kotlin, adhering to Clean Architecture and MVVM principles.
Reviews
M
Maxime
Wise Building
Reviewed on 6/4/2024
Mission underway for several months on native Android Kotlin & Jetpack Compose development, Julien is technically proficient and the delivered features perfectly match the request. Smooth communication and Julien alerts on potential issues
Gilbert
Rewind
Reviewed on 8/21/2023
Excellent work as usual!
Recommendations
CS
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Education
- Developing Android Apps with KotlinUDACITY2020
- Accessibility FundamentalsAccesstia2025Formation aux fondamentaux de l’accessibilité numérique (WCAG / RGAA) : principes de conception inclusive, bonnes pratiques web accessibles, navigation clavier, contrastes, structure des contenus et identification des principaux problèmes d’accessibilité.