YBFreelancer profile translated to English.
Back to original languageAbout Youssef
Android and Android TV expert (Java & Kotlin) with over 7 years of experience, I design high-performance, secure, and accessible applications. Autonomous and collaborative, I adapt equally well in a team or remotely. Passionate about innovation, I am ready to take on new challenges!
French
Native or bilingual
English
Native or bilingual
Can work on-site
Paris (up to 50km)
Experience
- 2W Consulting (Vision)Senior Android DeveloperNovember 2024 - Today (1 year and 7 months)Paris, FranceProject: Redesign of a streaming application (video/audio playback).Context: Complete redesign of an Android streaming application by migrating the user interface from XML to Jetpack Compose for a declarative and optimized UI, and by adopting the MVI architecture instead of MVP for better state management and a more reactive approach.Programming Language: KotlinDevices: Native Android (smartphones, tablets, Android boxes, and smart TVs).Key Features:
- Complete redesign of the user interface, moving from XML to Jetpack Compose, offering a more flexible and responsive experience.
- Redesign of the entire business logic layer of the application to adopt the new design with Jetpack Compose.
- Transition of the application architecture from MVP to MVI, facilitating separation of concerns and optimizing code testability.
- Optimization of application performance to ensure maximum fluidity on various streaming devices.
- Collaboration with technical teams to maintain cross-platform compatibility and improve user engagement.
Users: B2CFront-End Team Organization: Dedicated squad with 1 PM, 1 Android Tech Lead, 2 Android Developers, 1 QA, and 1 Designer.Cross-functional Relations: Back-end teamMethodology: ScrumTechnical Environment: Kotlin, Exo-player, XML, Jetpack Compose, navigation compose, Shared Preferences, Room, Retrofit2, OkHttp, Coroutine, flow, stateflow, sharedflow, junit4, lintTools: Android Studio, Postman, SonarQube, Lint, Figma, Jira, GithubHardware Used: MacBook Pro - M Consulting (Decathlon Digital),Senior Mobile DeveloperJune 2023 - October 2024 (1 year and 4 months)Paris, FranceProject: Development and maintenance of 2 Android applications (CIS and AppLog)Context: Design, development, and optimization of features for the "Cube in Store" and "AppLog" applications, ensuring optimal performance and a smooth user experience. In collaboration with the design and QA teams, I applied best development practices, conducted unit and UI tests, and integrated new technologies to meet evolving user needs.Programming Language: Kotlin & JavaDevices: Native Android (smartphones, Zebra TC52).Key Features:
- Development of the date filtering feature (fixed or interval) with Materials 3 for "second life" products resold, (UI part with Jetpack compose and logic part).
- Improvement of the search functionality by integrating the search for "second life" products in the dedicated section for all Decathlon products.
- Refactoring and optimization of the "second life" products dashboard: improvement of filters (date, origin, categories),
- Design and integration of a new RFID and MobiPrint label format, consolidating all information of a "second life" item, and integrating it into the CIS application.
- Proactive analysis of Firebase Crashlytics reports to identify issues and causes of crashes.
- Ticket management via the internal Smax platform to address and resolve issues or blockages for employees using the CIS application.
- Pair programming: Collaborative work in pairs to solve complex problems or share technical knowledge.
Technical Environment: Jetpack Compose, Koin, Hilt, Retrofit2, Room, Coroutine, Flow, stateFlow, Mockito, Junit4, EspressoPostman, Swagger, SonarQube, Lint, Bitrise, Firebase Crashlytics, Figma - 2W Consulting (Vision)Senior Android DeveloperJanuary 2017 - November 2022 (5 years and 10 months)Sousse, TunisiaProject: Development of multimedia streaming applicationsContext: Suite of online streaming and entertainment applications, built around advanced streaming technologies (SmoothStreams, HLS, DASH) and compatible with various video/audio playback formats (MP4, MKV) for optimal adaptation across multiple devices (smartphones, tablets, Android boxes, and smart TVs).Programming Language: Kotlin, Java, and C++Devices: Native Android (smartphones, tablets, Android boxes, and smart TVs).Key Features:
- Implementation of an MVVM architecture to ensure code maintainability and modularity.
- Adoption and implementation of HLS, DASH, and SmoothStreaming technologies to ensure smooth and adaptive playback.
- Generation and integration of the FFMPEG library to process different video/audio formats.
- Development of advanced video management modules, including support for casting to external devices (Chromecast, Android TV).
- Consumption of REST web services for user data management, multimedia content retrieval, and updates.
- Implementation of synchronization and daily update mechanisms to ensure up-to-date data.
- Implementation of AES CBC 256-bit encryption to secure sensitive data transmitted and stored.
- Performance optimization using Coroutines for asynchronous task management.
- Writing unit tests with JUnit4 and integration tests with Espresso, achieving 60% test coverage.
- Regular code refactoring to improve readability and reduce technical debt.
Technical Environment: JAVA, Kotlin, Exo-player, XML, Jetpack Compose, Shared Preferences, Room, Retrofit2, OkHttp, Coroutine, Live Data, flow, stateflow, junit4, lintTools: Postman, SonarQube, Lint, Firebase Crashlytics, Figma, Jira, Github
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Education
- Telecommunications and Computer Networks Engineering –POLYTECHNIQUE,2016Ingénierie de télécoms et réseaux informatiques –
- Applied License in Computer NetworksISITCOM,2013License appliquée dans les réseaux informatiques