Freelancer profile translated to English.
Back to original languageAbout Julien
I design and develop complex fullstack systems with a strong specialization in AI architecture — multi-agent pipelines, LLM orchestration, Vercel AI SDK integration, and production-ready Next.js/Node.js/MongoDB applications.
I recently built from scratch a SaaS platform for generating web applications via a multi-agent pipeline (specialized agents, structured DSL, automated visual QA via screenshots). This type of project — where AI is not an add-on but the core of the system — is my comfort zone.
What I bring concretely:
• Architecture and development of JS/TS agentic pipelines (orchestration, context management, prompt caching)
• Fullstack Next.js 15 / Node.js / MongoDB applications with LLM integrations
• Scaling AI POCs to reliable production systems
I thrive on projects with real technical complexity and stakes beyond "making a CRUD app".
English
Native or bilingual
French
Native or bilingual
Can work on-site
Annecy (up to 50km)
Experience
- KomposiaSoftware Architect - Full Stack JSSOFTWARE PUBLISHINGFebruary 2025 - Today (1 year and 6 months)Annecy, FranceKey responsibilities and achievements• Designed the complete architecture: Builder / Runtime / API / Engine (Next.js + Node.js + MongoDB Atlas)• Implemented an executable DSL for logical pipelines, integrating conditions, loops, and AI triggers• Developed a dynamic component engine with JSON Schema + React + TailwindCSS rendering• Implemented an orchestrating AI (OpenAI Agents SDK) capable of automatically generating:• component trees,• data workflows,• and multi-tenant deployments.• Managed cloud deployments on Vercel, Railway, and Google Cloud, with dynamic secrets and contexts• Designed a multi-agent ecosystem: Planner, RoutingAgent, EventsAgent, FinalizerAgent, etc.• Implemented a dynamic RBAC system compatible with Clerk (authentication, permissions, capabilities)• Optimized offline storage and performance using MongoDB Change Streams & Vector Search• Oversaw the design system and integrated ShadCN + Tailwind⸻🧩 Stack & ToolsTypeScript, Next.js (App Router), Node.js, MongoDB Atlas, TailwindCSS,Zod, OpenAI SDK, Vercel AI SDK, Railway CLI, GCP Storage, Clerk,Zustand, Vercel Deploy Hooks⸻🎯 Key Skills Developed• Multi-tenant SaaS and Software Architecture• AI Automation & Agentic Design• Code and logic generation from schemas• Cloud deployment & observability• UI/UX for low-code platforms• Product strategy and rapid prototyping
- EukleiaLead Front-End DeveloperDIGITAL AND ITMarch 2019 - January 2025 (5 years and 11 months)Genève, SwitzerlandFor the past 5 years, I've been a fullstack JS developer working with React, Next.js, Node.js, and JavaScript GraphQL.I developed entirely the front-end and Node.js services for a low-code application featuring a database editor and a website builder, enabling users to create entire applications in a low-code environment.I also developed an SSR server and an internal library.
- SopraSteriaFront-End DeveloperDIGITAL AND ITNovember 2018 - Today (7 years and 9 months)Annecy, FranceTransitioned the current application (jQuery, Backbone) to React.
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Education
- Web Developer BachelorO'Clock2017React Node js MongoDB
- Master in ManagementKedges School of Management2010Programme école supérieure de commerce. Spécialisation finance d’entreprise.
Certifications
- OpQuast - Web QualityOpquast