Freelancer profile translated to English.
Back to original languageAbout Antonin
Passionate about the web and artificial intelligence, I create custom applications with NestJS, LangChain, LangGraph, Next.js, and TypeScript.
I enjoy building clear, performant, and well-structured projects, from prototype to deployment.
Currently on a long-term mission developing a SaaS & AI architecture.
I am available 2-3 days a week to support a second project. ✅
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 20km)
Experience
- BackRestoFull-Stack Developer | Web Integration & AI AgentsRESTAURANTS AND FOOD SERVICEJanuary 2026 - Today (7 months)Paris, FranceAssisting Backresto, a food safety management SaaS solution, in a major feature evolution phase. My mission focuses on scaling the platform through an architecture redesign and the integration of artificial intelligence technologies.Major axes of the mission:Customer Portal Redesign: Migration and complete redesign of the subscription management portal using Next.js to optimize performance and user experience.Billing System: Implementation of the complete subscription and payment management workflow via the Stripe API.Development of Complex Business Modules: Design of an interactive Planning system and dynamic Checklists with "Offline-first" support (via Amplify DataStore) to ensure smooth use in the kitchen, even without a stable connection.Artificial Intelligence & Automation: Evolution and maintenance of the LangGraph-based AI agent.Serverless-First Architecture: NoSQL data modeling with DynamoDB, GraphQL schema definition (AppSync), and access security via AWS Cognito.Technical Stack:Frontend: Next.js (SSR/SSG), TypeScript, Chakra UI.AWS Cloud: Lambda (Node.js), AppSync, Cognito, DynamoDB, Amplify.AI & R&D: LangGraph (agent orchestration), LLM integration.Tooling: Stripe API, GitHub Actions (CI/CD).
- BackRestoFull-Stack Developer | Web Integration & AI AgentsRESTAURANTS AND FOOD SERVICEJune 2025 - December 2025 (6 months)Paris, FranceWithin the BackResto project, I designed and developed several web and AI products, from dynamic platforms to a complete conversational agent.1. Partners System – Ecosystem Management PlatformDevelopment of a headless CMS (MDX + Zod) to manage partner content and automatically generate pages via Next.js.Framer Motion animations, secure form, and Brevo API automations.2. HACCP Audit Form – Complete Web ApplicationGround-up design of a multi-step wizard allowing restaurateurs to conduct an online HACCP audit.Real-time validation, intelligent scoring, custom PDF generation, and HubSpot, Brevo, PostHog integrations.Stack: Next.js 15, React 19, TypeScript, Tailwind, React Hook Form, Zod, Playwright, Vitest.3. AI Agent – Discord Sales AssistantDesign and architecture of a conversational AI agent with LangChain / LangGraph under NestJS (Clean Architecture).AI tools dedicated to sales management (restaurants, subscriptions, billing), multi-LLM support (OpenAI, Anthropic, Mistral), and AWS DynamoDB storage.🧠 Key Skills: Next.js • React • TypeScript • NestJS • LangChain • LangGraph • Discord.js • Tailwind • HubSpot • Brevo • DynamoDB • E2E Testing
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Education
- Digital Technology Architect42 ParisFormation intensive en programmation logicielle et architecture système. Apprentissage par projets en C, C++, Docker, réseaux, sécurité, systèmes Unix et développement web. Mise en pratique de la logique algorithmique, du travail en équipe et des bonnes pratiques DevOps.
Certifications
- AWS Certified AI PractitionerAmazon Web Services (AWS)2025