Freelancer profile translated to English.
Back to original languageAbout Jérémy
🚀 Mobile Developer | React-Native | Expo | iOS & Android – 80+ successful missions
Are you looking to develop or improve areliable and high-performance mobile application**, available on **iOSandAndroid**? I help startups and scale-ups transform their needs into concrete solutions using **React-Native**, **Expo**, **React.JSand **Typescript**.
With over10 years of experienceand more than80 successful missions**, I support both startups in the launch phase and established product teams. I work on the creation of mobile applications, technical redesign, performance optimization, and I assist as a **CTOin strategic choices.
Among my achievements:
– Mistral**: improvement of the mobile app with native **Swift/Kotlinmodules and the addition of key features, strengthening the user experience and the product.
– Snoop Media**: **CTOin charge of the technical architecture, theNest.jsback-end, and theReact-Nativemobile apps.
– Cookomix**: recipe application in **React-Native**, **+100,000 userseach month.
– **Betclic Group**: development of the Betclic TV application in **React-Native**.
My approach: deliver a turnkey, robust, maintainable, and scalable product. My expertise covers themobile and web front-end(**React-Native, Expo, React.JS, Next.js**), the back-end (**Nest.js, Node.js, Prisma, TypeORM, Firebase**) and the development ofnative bridgesiOS/Android viaSwiftandKotlinif necessary.
I work inAgile**, with **TDDand **CI/CD**, to guarantee fast and reliable deliveries. I also support teams via **React-Native training and mentoring**, a framework that I have mastered since 2015.
Ready to launch or improve your application? Contact me, I am available for a video call and I will respond within 24 hours.
English
Fluent
French
Native or bilingual
Can work on-site
Paris (up to 50km), Bordeaux (up to 50km), Lyon (up to 50km), Lille (up to 50km), Marseille (up to 50km)
Experience
- Mistral AIMobile Developer | React Native | iOS & AndroidTECHMarch 2025 - August 2025 (5 months)Paris, France→ Mission objective:Improve the Mistral mobile application by integrating new native features to optimize the user experience.→ Achievements:• Mobile development with React Native, Expo and TypeScript to create new screens and improve cross-platform iOS/Android fluidity, increasing perceived quality and user retention.• Integration of native Swift/Kotlin modules (PDF preview, Mistral widget, lock screen shortcuts) to offer advanced and differentiating features, strengthening the performance and visibility of the app.• Implementation of an optimized design with Tailwind/NativeWind, guaranteeing a modern, consistent interface and significant time savings in development and maintenance.→ Technical stack:React Native, Expo, TypeScript, iOS, Android, Swift, Kotlin, Tailwind, NativeWind
- TwentyFull-stack Developer | React.JS | Nest.JSSOFTWARE PUBLISHINGJune 2023 - March 2025 (1 year and 9 months)Paris, France→ Mission objective:Contribute to the technical foundations of the Twenty open-source CRM to offer a high-performance and scalable alternative to Salesforce.https://github.com/twentyhq/twenty→ Achievements:• Backend design with Nest.JS and TypeScript: dynamic generation of the multi-tenant GraphQL schema, addition of indexing and BDD optimization to improve performance and scalability.• Front-end development in React.JS: creation of multiple screens and features, strengthening the perceived quality and user experience on the CRM.• Implementation of an ORM overlay and multi-tenant tools, facilitating maintenance, web integration and time savings on the development side.→ Technical stack:React.JS, Nest.JS, TypeScript, JavaScript, GraphQL, TypeORM, Postgres
- SNOOP MEDIAMobile Developer | React Native | iOS & AndroidSOCIAL NETWORKSJanuary 2022 - June 2023 (1 year and 6 months)Paris, France→ Mission objective:Lay the technical and organizational foundations of Snoop, a social network for recommending films and series, by ensuring the role of CTO and lead developer.→ Achievements:• Implementation of the complete mobile architecture with React Native, Expo, Redux, and deployment on iOS/Android via EAS and CI/CD, guaranteeing smooth performance and reduced time-to-market.• Back-end development in Nest.JS and TypeScript, with a solid and scalable base to support the growth of the app, improving reliability and server performance.• UI/UX contribution to the designer and supervision of the tech team (recruitment, sprints, daily tasks), allowing time savings, better perceived quality and a structured team.→ Technical stack:React Native, Expo, iOS, Android, EAS, CI/CD, Redux, Nest.JS, TypeScript
Reviews
Recommendations
+1
These freelancer profiles also match your criteria
Agatha Frydrych
Backend Java Software Engineer
4.7
(3)
2
Baptiste Duhen
Fullstack developer
4.6
(4)
5
Amed Hamou
Senior Lead Developer
4
(2)
7
Audrey Champion
Web developer
4.3
(3)
4
Education
- Computer Engineering DegreeEpitech2016
- Computer ScienceCalifornia State University San Marcos2015
Certifications
- Self-taughtA certification that is always in progress, I certify my skills a little more each day