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Mathias CassonnetMC

Mathias Cassonnet

Android Developer | Kotlin & Compose

€400/day
Bordeaux, FR
3-7 years
Android
Kotlin
Jetpack Compose
Mobile Development
Java

Average response time: 1 hour

Freelancer profile translated to English.
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About Mathias

Hello! 👋 I'm Mathias, an Android Mobile Developer, a graduate of Epitech, specializing in Kotlin and Jetpack Compose technologies.

With nearly 4 years of experience (ESN, startups, scratch projects), I help companies design, develop, and modernize their native Android applications. I've had the opportunity to work for major clients (Orange, Enedis) as well as on innovative and ambitious projects (Rematch, maritime IoT).

🛠️ My technical expertise:

  • Native Android Development:Kotlin, Java, Jetpack Compose, Coroutines, MVVM/Clean Architecture.

  • Quality & Automation (My big plus):I don't just code, I secure! Creation of E2E tests (Appium, Robot Framework, WebdriverIO) to ensure crash-free apps.
  • IoT & Connected Objects:Strong experience in integrating Bluetooth (BLE) protocols between an application and physical hardware.

  • Mobile DevOps:Setting up and managing CI/CD pipelines (Gitlab, Bitrise) for smooth deployments to the stores.

💡 My approach: > Rigorous, curious, and proactive, I like to fully invest myself in the projects I join, from architectural thinking to production deployment.

📍 Based in Bordeaux, I am available for remote or on-site missions (Bordeaux region).

Feel free to contact me to discuss your project, I would be delighted to chat with you! 🚀

  • French

    Native or bilingual

  • English

    Conversational

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

Experience

  • Rematch
    Android Developer
    SPORTS
    January 2026 - March 2026 (2 months)
    Bordeaux, France
    Within the technical team of Rematch (a video application dedicated to amateur sports highlights), I was involved in the evolution and maintenance of the Android application.

    🛠 Technical environment:Kotlin, Jetpack Compose, JAVA, MVVM Architecture, REST API calls, Git.

    🎯 My main missions:
    • Development and integration of new UI/UX features.
    • Bug fixing and optimization of the application's overall performance.
    • Collaboration with the technical team and participation in code reviews.
    Kotlin Android Jetpack Compose Java
  • Niji
    Mobile Developer
    DIGITAL AND IT
    March 2023 - January 2026 (2 years and 10 months)
    Bordeaux, France
    As a Mobile Developer (Android/iOS) at Niji, I actively participated in the design, development, and maintenance of native mobile applications for major clients. I also implemented advanced test automation strategies.

    🛠 Technical environment:Kotlin, Java, Swift (UIKit), Jetpack Compose, Coroutines, Flow, REST API (Retrofit), Gitlab CI/CD, Jira.
    🧪 Test Stack:Appium, Robot Framework, WebdriverIO.

    🎯 Notable projects & Achievements:
    • Enedis (Energy):Technical modernization of a key business application. Successful migration of the existing interface to Jetpack Compose.
    • Kahe Nautic (IoT/Sport):Graphic redesign of Android and iOS applications. Integration of a new marine engine via a complex Bluetooth protocol (BluetoothGattCharacteristic, CBCharacteristic).
    • Orange et Moi (Telecom):Development of the E2E testing strategy. Creation of automated test suites (Sanity and Nightly) to ensure the robustness of the main client application.
    • Oeneo (Industry):Development of new features, autonomous management of the release cycle (pre-production/production), and code quality maintenance via SonarQube.
    Jetpack Compose Kotlin Android Java Agile Methodology
  • Bassetti Group
    Delphi Developer
    DIGITAL AND IT
    September 2022 - February 2023 (5 months)
    Bordeaux, France
    At Bassetti Group, a technical software publisher, I was involved in the evolutionary and corrective maintenance of software projects to meet specific client needs.

    🛠 Technical environment:Delphi.

    🎯 My main missions:
    • Analysis of specifications and client requirements.
    • Development of new features and improvement of existing codebases.
    • Bug fixing (MCO - Maintenance in Operational Condition) to ensure application stability.
    • Rigor and adaptability on historical technologies.
    Claude Agile Methodology Generative AI Kotlin Java
Check out Mathias's experience

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Education

  • Expert in Information Technology Title
    Epitech
    2023
    Cursus intensif basé sur la pédagogie par projets (Piscines, projets long terme). Maîtrise des concepts d'architecture logicielle, de l'algorithmie et du développement (C, C++, Java, Kotlin). Forte culture de l'autonomie, résolution de problèmes complexes et gestion de projets en méthodes Agiles (Scrum).
  • Associate's degree in Design and Implementation of Automatic Systems
    Lycée Polyvalent Régional Alfred KASTLER
    2016
    bac +2, BTS Conception et Réalisation de Système Automatique

Skill set

Claude
Generative AI

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