Freelancer profile translated to English.
Back to original languageAbout Youssef
I build iOS and Android applications in React Native and Expo.
8 years of mobile specialization, in production for millions of users:
- Stadion: shared Expo architecture, deployed simultaneously forNewcastle United, Southampton FC, Luton Town, and ITF(65 countries)
-Bouygues Telecom(27M mobile customers): consumer app, plan and subscription management, comprehensive support module
- **Nexity**: home automation app for connected homes, React Native migration completed without service interruption
Stack: React Native, Expo, TypeScript, GraphQL, Redux, EAS Build, Firebase, CI/CD, Detox, REST API
English
Fluent
French
Native or bilingual
Remote only
Primarily works remotely
Experience
- StadionReact Native & Expo DeveloperSPORTSNovember 2024 - January 2026 (1 year and 2 months)Paris, FranceReact Native & Expo Developer for Stadion, a mobile application platform used by international sports clubs and federations.Clients:Newcastle United, Southampton FC, Luton Town, ITF(International Tennis Federation, 65+ member countries). All applications are published on the App Store and Google Play Store.What was built:A shared React Native/Expo architecture across 4 clients, deployed simultaneously, with each club maintaining its visual identity, while the code remains a single maintainable base.A design system and app template that allow launching a new organization in a few weeks instead of starting from scratch.An optimized CI/CD pipeline that reduces build times and automates releases to the stores.
- Bouygues TelecomReact Native DeveloperTELECOMMUNICATIONSJuly 2023 - November 2024 (1 year and 4 months)Meudon, FranceReact Native Developer on theBouygues Telecomconsumer application, managing plans, subscriptions, and equipment for a customer base of 27 million mobile users.18-month assignment within the product team, on a critical scope:Full end-to-end development of a new support module, user journey, API integration, error case management.Implementation of automated tests (Detox) to reduce regressions on a high-traffic codebase.Continuous maintenance and evolution of existing features without service interruption.Stack: React Native, TypeScript, Detox
- NEXITYReact Native DeveloperREAL ESTATEOctober 2021 - June 2023 (1 year and 8 months)Paris, FranceReact Native Developer on theNexityhome automation app, controlling connected home devices (heating, blinds, lights) for residents of new housing.20-month assignment with complete autonomy on the mobile scope:React Native migration and critical library updates completed without service interruption, on a production app with active users.Extension and improvement of existing features throughout the assignment, with regular releases to the stores.Management of IoT constraints specific to mobile: latency, synchronization of physical state and interface, device connection error handling.Stack: React Native, TypeScript.
Reviews
Recommendations
FU
+7
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Education
- Professional License in Automation and Computer Science for Embedded SystemsUniversity2006
- FullStack Developer React.js React NativeLeReacteur2018• Utiliser les outils de développement adaptés • Découvrir et maîtriser les bases de la programmation JavaScript • Intégrer des sites Internet “responsive” • Créer des APIs et les déployer sur un PaSS (Heroku) • Gérer le stockage distant de données sur des bases situées dans le Cloud • Utiliser le framework React pour la création de sites dynamiques • Installer, configurer et utiliser des bibliothèques JavaScript • Construire une application Mobile native pour iOS et Android