Freelancer profile translated to English.
Back to original languageAbout Julien
🧭 Full-stack & mobile developer for startups, I transform your ideas into complete, robust, and scalable digital products, from zero to launch, ensuring speed, reliability, and user impact.
I assist founders in creating high-performing, tested, scalable web and mobile MVPs ready to convince users and investors. I cover all technical aspects, from architecture to production, with a focus on productivity and added value for your business.
💡 Projects
Web and Mobile Applications: Design and development of reliable, high-performing, and scalable SaaS and cross-platform applications with intuitive interfaces
🚀 Key Projects
➡️ SortiPéi: Web and mobile app listing cultural events in Reunion Island
➡️ Live Me Up: Live shopping e-commerce application
➡️ OddZone: Sports betting mobile app
➡️ Other projects: HR SaaS, Research, Public sector
⚙️ Expertise
📱 Mobile Development:
➡️ Design and development of iOS and Android applications withReact Nativeand Expo, focused on user experience
💻 Frontend Web Development:
➡️ Web applications withReactand Redux
➡️ Styling: CSS, SASS, Tailwind
⚙️ Backend & API Development:
➡️ Robust and scalable backends withNode.jsandNext.js
➡️ Database management, mastery of security standards
➡️ External API Management: Google, Meta...
🧩 My Approach and Added Value
➡️ Autonomy and Clarity: I build complete, solid, fast-to-deliver, and immediately useful products
➡️ Product Vision: Quick needs assessment, feature prioritization
➡️ Concrete Results: Tested, reliable, scalable, and ready-to-use deliverables generating real business impact.
➡️ Productivity & AI: Use of AI tools to accelerate development and deliver quickly
📬 Contact
➡️ Response in under an hour.
➡️ Available 7 days a week via Malt messaging.
French
Native or bilingual
English
Native or bilingual
Spanish
Basic
Can work on-site
Paris (up to 50km), Lyon (up to 50km), Bordeaux (up to 50km), Nantes (up to 50km), Marseille (up to 50km)
Experience
- SortiPéi - L'application pour sortir à La RéunionTechnical Director (CTO) / Full-stack and Mobile DeveloperCULTUREDecember 2024 - Today (1 year and 6 months)Saint-Denis, FranceCreation of the SortiPéi application, which lists several thousand events in Reunion Island.Complete technical direction of the project, from architecture to production:
- Cross-platform mobile application (Expo / **React Native**) managing several thousand users
- Secure API (**Node.js**), powerful, tested, and stable
- Back-office (**React**)
- Website, SEO
- Infrastructure deployment and management
- Automated statistical reports
Project management, in collaboration with two co-founders:- Needs definition
- Design
- Mockups, UI and UX considerations
- Development
- Deployment
- Client support, communication, sales management
- Continuous improvement
**Results**:- An application that convinced 2000 users in a week and will evolve into a major tool in the cultural and social life of Reunion Island
- An internal management interface and automation tools that significantly reduce the effort of event searching
- Live Me UpFull-stack and Mobile Developer - Node / React / React Native / RemixENTERTAINMENT AND LEISUREJanuary 2022 - Today (4 years and 5 months)Lille, FranceFull-stack and mobile multi-project development in the world of video streaming and e-commerceI developed numerous features independently or as part of a team, always addressing all stages of design: assistance in defining needs, prototyping, back-end, front-end, and mobile development, optimizations, security, testing, and delivery.I worked on a client back-office, a client video player, an Android/iOS video streaming application, and a Remix application within an integrated Shopify environment.
- Fullstack:Remix
- Frontend: **React**, Redux, RxJS
- Backend: **Node.js**, MongoDB
- Mobile:React Native
- Shopify app development
- Atomic Architecture
- CQRS Architecture
- Clean Architecture
- Domain-Driven Design
- Functional Programming (Effect / fp-ts)
- External Integrations (Google / Meta)
- Material UI, Styled components
- Automated tests
Result:A modern and ultra-high-performance suite of tools to enable sellers to showcase their products in live video to thousands of customers. - WEB2DOFull-stack and Mobile Developer Angular / React Native / SymfonySOFTWARE PUBLISHINGSeptember 2020 - Today (5 years and 9 months)Development of the OddZone sports betting mobile application and back-end management interface. I personally managed all development stages: software architecture, task management, feature development, bug fixes, maintenance, security, and optimization.
- Development of the application with React Native for iOS and Android
- Backend development with Symfony 5 and API Platform
- Administration interface with Angular 12
- Atomic architecture, BEM methodology
- Design choices
- Feature development
- Bug fixes, maintenance, security, optimization
- Unit tests
Result:An application that has appealed to thousands of users and attracted the attention of major players in the entertainment and sports industry.
Reviews
Romain
Web2Do
Reviewed on 5/8/2019
After several assignments with Julien, I can only recommend him.
Romain
Web2Do
Reviewed on 4/12/2019
Recommendations
FU
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Education
- Master MIASHS (Mathematics and Computer Science Applied to Human and Social Sciences)Université Grenoble Alpes2018* XHTML et HTML5, CSS, Javascript, AJAX, Node.js, AngularJS * XML (Schema, XPATH, XSLT, SVG), JSON * JavaEE (Servlets, JSP, JSF, JPA) , .Net (ASP), PHP/MySQL * Programmation mobile (Android), Web sémantique. * Modèles et architectures cognitifs * Bases statistiques du data-mining * Traitement automatique des langues pour le Web * Intelligence artificielle * Sécurité des infrastructures et applications web * Génie logiciel * Outils et plateformes de développement collaboratif * Architecture des interfaces et ergonomie * Droit des entreprises
- Bachelor's Degree in Computer Science (Bac +3)Université du Québec à Chicoutimi, Chicoutimi, Quebec, Canada2018* Développement web Front-end, Back-end * Sécurité web et réseaux * OpenGL / WebGL * Développement Android * Développement Logiciel * Informatique Théorique