Freelancer profile translated to English.
Back to original languageAbout Matthias
Senior Fullstack Engineer with 8 years of experience on Node.js / TypeScript production projects; from critical APIs to video pipelines serving 500,000 active users per day.
I work on backend, fullstack, or AI missions: Node.js / NestJS architecture, LLM and RAG integration, multi-agent orchestration, Vue.js and React on the frontend.
What I bring concretely:
— Robust and scalable REST/GraphQL APIs in TypeScript
— AI integration in production: RAG, LLM agents, Vercel AI SDK
— Complex backend pipelines: video, Stripe payment/webhooks, asynchronous workers
— Docker / AWS / CI-CD infrastructure
— Payment system integration (Stripe, subscription management, idempotence)
I can also act as a consultant: technical debt audit, progressive refactoring, implementation of good architectural practices on existing codebases. Useful if you have a product that is running but starting to struggle under load or becoming expensive to maintain.
French
Native or bilingual
English
Native or bilingual
Remote only
Primarily works remotely
Experience
- EasyBroadcastLead Fullstack Engineer & Project Coordinator — Real-time VOD & Analytics PlatformApril 2022 - October 2025 (3 years and 6 months)Nantes, FranceReal-time video streaming and analytics SaaS platform, up to 500,000 active users per day. Mission of complete technical overhaul across the entire stack.Stack: Node.js, TypeScript, Vue.js 3, AdonisJS, NestJs, PostgreSQL, FFmpeg, Stripe, Docker, GitLab CI/CDContributions:→ Scalable and modular Node.js / microservices architecture→ FFmpeg video pipeline: transcoding, AI automated subtitling, HLS packaging→ Stripe integration: subscriptions, idempotent webhooks, billing management→ REST and WebSockets APIs for real-time communication→ Integration of a push notification system via NestJS open-source package→ Progressive migration legacy → Vue.js 3 + TypeScript→ Technical supervision of a team of 3 developers→ Automated CI/CD, staging environments→ Cloud deployment: OVH, Google Cloud, AWS depending on projectsImpact:Platform maintained at 500K DAU with no major interruptions. Significant reduction in post-migration regressions. AI video pipeline integrated into production.
- Olea MedicalFullstack Software EngineerJune 2021 - November 2021 (5 months)La Ciotat, France🎯 Context:Development of 3D MRI image analysis medical software for neurological diagnosis assistance.⚙️ Stack:Vue.js, Nuxt.js, TypeScript, Java (backend), PostgreSQL, GitLab CI/CD🚀 Contributions:•Development of interactive front-end interfaces in Vue.js / Nuxt•Integration of the Java backend via REST API and management of large image flows•Collaboration with researchers and engineers to optimize 3D performance•Implementation of CI/CD pipelines and build automation💡 Impact:Improved display fluidity of 3D MRIs and better user experience.
- 3WRHFull-stack React.js / Node.js DeveloperRESTAURANTS AND FOOD SERVICESeptember 2020 - October 2020Marseille, France🎯 Context:Creation of a complete showcase website for a restaurant chain (La Taverne de Maître Kanter).⚙️ Stack:React.js, Node.js, Express, Firebase, Mailjet, PostgreSQL🚀 Contributions:•Development of the complete front-end with React.js•Implementation of a contact form system with email sending (Mailjet + Node.js)•Database design and back-end integration via REST API•Website deployment and hosting💡 Impact:Fast delivery and increased reliability thanks to a simple and clean architecture.
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Education
- RNCP 5 (EU)3W Academy2020HTML, CSS, Javascript, React.js, React Native, Node.js, PHP, Symfony, Mysql, MongoDB, API Rest, Github. Ecosystème JS: npm, Babel/webpack
- RNCP 6 (EU)3W Academy2020Full stack React & Symfony