Freelancer profile translated to English.
Back to original languageAbout Gramos
React Native Mobile Developer – iOS & Android (Expo) | +7 years of experience
Looking for a mobile developer capable of designing arobust and production-readymobile application?
I supportstartups, scale-ups, and companiesin creating and launching iOS & Android applications with React Native and Expo, from idea to deployment on the App Store and Play Store.
With+100,000 active userson the applications I've developed and a5/5 satisfaction rate**, I combine **technical expertisewithbusiness visionto deliver high-performing, scalable mobile products aligned with your objectives.
🚀Some achievements
- **FIA WEC**: Official application (live timing & streaming), **+100k users**.
- **Carspot**: Automotive spotting, AI + registration API, **+62k spots and +8k users**.
💡My expertise
- BackendNode.js / NestJS / GraphQL / Firebase.
- **Service integration**: payment (Stripe, PayPal), AI (OpenAI), push notifications, real-time live data.
- **CI/CD**, store publication, performance optimization, monitoring & maintenance.
- Consulting inarchitecture, scalability, and product strategy.
🔎My working method
- Analysis of your real needs.
- Proposal of concrete and adapted solutions.
- Agile development with continuous feedback,prototype in 7 days.
- QA testing & performance optimization.
- Deployment, post-delivery monitoring, and evolutionary maintenance.
📩 Contact me now to discuss your project. I can arrange a video call quickly and I commit to responding within 24 hours.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Rennes (up to 50km), Nantes (up to 50km)
Experience
- CarspotMobile Developer | React Native | Expo | Android & iOS | Car spotting appSOCIAL NETWORKSJune 2025 - July 2025 (1 month)Paris, France→ Mission Objective:Redesign the Carspot mobile app to improve UX/UI and enrich features used by +8,000 automotive enthusiasts.→ Achievements:
- Optimized React Native / Expo mobile development for iOS & Android, offering a fluid and responsive experience.
- Integration of identification AI and registration API, increasing perceived performance and quality.
- Scalable and backend-less architecture, saving time and resulting in +62,000 registered spots.
→ Technical Stack:React Native, Expo, JavaScript, iOS, Android, REST API - StartMobile Developer | React Native | Android & iOS | AI SaaS for AuctioneersARTS AND CRAFTSJanuary 2025 - March 2025 (2 months)Paris, France→ Mission Objective:Create an innovative B2B SaaS mobile application for auctioneers, integrating AI and automation, with product strategy and customer acquisition.→ Achievements:
- Cross-platform mobile development (React Native, Expo, iOS, Android) to optimize user experience and performance.
- Automation of inventories and CRM/Stripe integration, reducing management time and improving productivity.
- Design of an MVP with an SEO-optimized landing page, increasing visibility and customer acquisition from launch.
→ Technical Stack:React Native, Expo, iOS, Android, Node.js, PostgreSQL, Stripe, CRM, OCR, AI - FIA WECMobile Developer | React Native | Official FIA WEC App | Streaming + live dataSPORTSJanuary 2024 - January 2025 (1 year and 1 month)Paris, France→ Mission Objective:Design and optimize the official FIA WEC mobile application to offer streaming, live data, and a smooth user experience on iOS and Android.→ Achievements:
- Mobile development with React Native & Expo for a fast and fluid iOS/Android experience, improving engagement for +100,000 active users.
- Real-time integration of sports data via GraphQL, providing live tracking and instant rankings for better performance and reliability.
- Complete refactor of the TypeScript architecture, reducing technical debt and improving maintainability to accelerate future evolutions.
→ Technical Stack:React Native, Expo, TypeScript, GraphQL, iOS, Android, App Store, Play Store
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Education
- Professional Bachelor's degree in work-study programIUT de Reims-Châlons-Charleville2018Licence professionnelle en alternance
- Digital Project Manager, Project ManagementOpenClassrooms2017Chef de projet digital, Gestion de projet