Freelancer profile translated to English.

Description

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 idea to publication on the Google Play Store, including the development phase!

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 such as 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!

Industry field of expertise

Languages

French
Native or bilingual
English
Fluent
Spanish
Conversational

Workplace preferences

Remote only

Primarily works remotely

MyTravelBill
KMP (IOS & Android) Developer, Backend Spring Boot
TRAVEL AND TOURISM
August 2025 - December 2025 (4 months)
Toulouse, France
MyTravelBill simplifies group travel financial management. 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 under Spring Boot.

Missions & Achievements
- Kotlin Multiplatform (KMP) Architecture: Design and implementation of the shared module (Shared Module) encompassing business logic, API calls (Ktor), and data persistence (Room).

- Shared interface 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.
KMP Kotlin Multiplatform Android SDK Android Development Spring Boot
LocaShift
Android Developer - Jetpack Compose - Kotlin
SOFTWARE PUBLISHING
April 2024 - June 2024 (2 months)
Toulouse, France
Creation of the application from scratch with publication on the Google PlayStore.
Application in Kotlin and Jetpack Compose on Android.

This application allows simulating a fake GPS position for the phone, enabling testing of other applications requiring 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 Android

Application:
Kotlin Jetpack Compose Android Google Maps Google Maps API
WiseBuilding
Lead Android Kotlin Developer
REAL ESTATE
January 2024 - Today (2 years and 5 months)
Paris, France
Wise Building is a centralized platform (SaaS) controlling smart building services and equipment. As the Android Development Manager, my mission is to design and maintain a robust core framework, capable of being deployed across dozens of building-specific applications (White-labeling).

Missions & 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.
Koin XML Jetpack Compose REST APIs MSAL

Check out Julien's experience

Maxime

Wise Building

Reviewed on 6/4/2024

Mission ongoing 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.