Freelancer profile translated to English.
Back to original languageAbout Ewen
Freelance Full Stack Web Developer | AI, SaaS & Real-Time Specialist
Do you have a web product to build or evolve? I will assist you from idea to production, with one requirement: clean, performant, and maintainable code.
Full-stack developer with an Epitech diploma (Master's degree) and 3 years of experience, I work across the entire chain:
🖥️ Frontend — React, Next.js, TypeScript: fast, polished, and accessible interfaces.
⚙️ Backend — Node.js, NestJS, PostgreSQL, Stripe: robust and well-architected APIs.
🤖 Applied AI — My specialty: RAG pipelines, LLM agents (LangChain/LangGraph), semantic search, and token-by-token streaming, already in production on SaaS platforms.
⚡ Real-time — WebSocket, SSE, Redis for large-scale reactive applications.
What sets me apart: I master both AI integration into a product and modern web architectures (Turborepo monorepo, scalable SaaS), with a real focus on performance and user experience.
Types of projects I work on:
• Complete web applications & SaaS platforms
• AI integration / conversational assistants (RAG, LLM)
• High-performance, SEO-optimized showcase websites
• Real-time systems and technical refactoring
Available for your freelance missions. Let's talk about your project — the first consultation is free.
📍 Paris · 🌐 ewenlq.fr
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 30km)
Experience
- FavikonAI Fullstack DeveloperOctober 2025 - Today (10 months)Paris, FranceDevelopment of features on Favikon, a B2B influencer marketing SaaS platform augmented by AI (210K+ users, 11.5M+ creators, and 30M+ posts indexed).Frontend: Modular Next.js / React architecture, state management (React Query, Redux), real-time (Socket.io, SSE), drag & drop widgets, and token-by-token streaming.Backend: Critical business modules (campaigns, discovery, messaging), specialized databases (MongoDB, Elasticsearch, Qdrant, Redis), and real-time pipelines.AI: Multi-agent systems (LangChain / LangGraph), AI streaming, semantic search, and automated generation of messages and recommendations.Mobile: Development of a native iOS application in Swift.
- MomentFullstack DeveloperSOFTWARE PUBLISHINGMay 2025 - October 2025 (5 months)Paris, FranceDevelopment of the Mood platform (embedded entertainment for Ouigo / TGV trains): frontend evolutions in Next.js and TypeScript, contribution to the Design System to improve interface consistency.Integration of the Universal Music France API: generation of a client with TypeSpec, NestJS backend integration, and automation of playlist management. Active participation in R&D projects.
- Guillemot Corporation / Hercules ThrustmasterFullstack DeveloperAugust 2024 - Today (2 years)Rennes, France
Design and development from scratch of a complete affiliation system for the marketing department: tracking, affiliate and conversion management. Strategic project in production with continuous evolution.
Cross-departmental collaboration (marketing, legal, accounting, esports) using agile methodology (Kanban, sprints). Stack: PHP / Laravel, CodeIgniter 4, MySQL.
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Education
- Grande École ProgramEpitech2025Certification Professionnelle RNCP 7