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Faysal SandaFS

Faysal Sanda

Senior Android Developer | Kotlin, Compose, KMP

€380/day
Caen, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Faysal

Looking for a senior Android developer capable of taking over an existing application, delivering new features, or modernizing a mobile architecture?

With over 8 years of Android experience, I design and evolve robust, performant, and maintainable Kotlin applications. I specialize in Jetpack Compose, Clean Architecture, modular architecture, and Kotlin Multiplatform, with a Kotlin Professional Certificate by JetBrains obtained in 2026.

My experience covers fintech and mobile payments (TapToPay, contactless payments), mobility and ticketing (sales, mTicket), as well as business and biometric applications.

I can assist you with:
- developing or evolving a native Android application;
- auditing, taking over, and stabilizing an existing project;
- migrating an XML interface to Jetpack Compose;
- designing a modular MVVM / Clean Architecture;
- integrating REST APIs, SDKs, payments, NFC, or biometrics;
- setting up tests, CI/CD, and Google Play publishing.

Stack: Kotlin, Java, Jetpack Compose, KMP, Coroutines, Flow, Hilt, Koin, Retrofit, Room, Ktor, SQLDelight, JUnit, and GitLab CI/CD.

Available for remote missions, one-off or long-term. Let's discuss your application and priorities.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Market Pay
    Android Developer
    BANKING AND INSURANCE
    July 2025 - Today (1 year and 1 month)
    Caen, France
    Development and continuous improvement of the Android TapToPay application, dedicated to customer payment acceptance, management, and processing.

    - Development of new features within the Interfaces squad.
    - Maintenance and improvement of existing code.
    - Bug analysis and correction.
    - Collaboration with the product team and other squad members.
    - Contribution to the application's quality, stability, and maintainability.

    Environment: Android, Kotlin, mobile payment, TapToPay, Agile methodology.
    Android Kotlin
  • INSTANT SYSTEM
    Android Developer
    TRANSPORTATION
    October 2023 - May 2025 (1 year and 6 months)
    Valbonne, France
    Development and maintenance of an Android mobility application dedicated to transport ticket sales, mTicketing, and ticketing.

    - Development and evolution of Android features.
    - Corrective maintenance and continuous improvement of the application.
    - Bug analysis and resolution.
    - Contribution to code quality and maintainability.
    - Close collaboration with product, design, QA, and project management teams to align technical choices with business needs.

    Context: mobility application in production, digital sales, and ticketing.
    Kotlin Android Jetpack Compose
  • FAMOCO
    Android Developer
    BANKING AND INSURANCE
    September 2021 - August 2023 (2 years)
    Rennes, France
    Development of Android applications for secure professional terminals.

    - Design and development of a biometric application for fingerprint capture.
    - Development of an application to test the functionalities of a contactless card payment API.
    - Integration and validation of Android features related to hardware and business services.
    - Bug analysis, correction, and application maintenance.
    - Collaboration with technical teams as part of the MIAGE apprenticeship.

    Context: Android, biometrics, contactless payment, and professional terminals.
    Android Kotlin

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Education

  • Master, MIAGE -Développement Logiciel et Intégration Système
    Université de Rennes
    2023
    Master, MIAGE -Développement Logiciel et Intégration Système
  • Licence,MIAGE
    Université de Rennes 1
    2021
    Méthodes Informatiques Appliquées à la Gestion des Entreprises

Certifications

  • Kotlin Professional Certificate by JetBrains
    JetBrains / LinkedIn Learning
    2026

Skill set

Categories