Freelancer profile translated to English.
Back to original languageAbout Jean Sébastien
Increase your project productivity by 30% while ensuring deliverable quality.
Tired of "Vibe Coding" and accumulating technical debt?
Former Engineering Manager at Scaleway, I help project leaders and startups transform their AI prototypes into scalable and high-performance production infrastructures.
Apply a real AI Engineer vision
🛠 My Method: The iASSET Framework
I don't just write code, I build an asset (ASSET) for your company. I act as a Founding Engineer to structure your technical stack and projects around 5 pillars:
[A]rchitecture:Clean & Hexagonal Design (Go, NestJS) to safeguard your business against AI hallucinations.
[S]pecification:Strict Contracts (Protobuf, Zod) to engrave your business rules in stone.
[S]ecurity:Data isolation and deployment on Sovereign Cloud (Scaleway). "Science without conscience is but the ruin of the soul."
[E]valuation:Expert Code Review (Human-in-the-loop) to maintain full control of your IP.
[T]esting:CI/CD Automation and AI Evals to deliver quickly, without ever breaking production.
🎯 Why work with me?
Critical Backend Expertise:I've orchestrated €2M/month flows (SGW Payment). I know what "High Availability" means in Go.
Augmented AI, not replaced:I don't develop models, I industrialize your AI R&D (RAG, pgvector, Mistral/Llama) for real results, without hallucinations.
"Founding Engineer" Vision:I assist you with Build vs Buy decisions and cost optimization (FinOps).
🚀 Support Format
Tech Support & Coaching:3-month support to structure your junior teams.
AI Maturity Audit:2-day flash diagnostic of your architecture and security.
AI-Ready MVP:Development of your critical components (Go, gRPC) in commando mode.
French
Native or bilingual
English
Fluent
Can work on-site
Paris (up to 10km)
Experience
- HodorSenior Software EngineerSOFTWARE PUBLISHINGApril 2026 - Today (2 months)Paris, France
Senior Software Engineer - Identity, policy & guardrail layer for AI agents
The adoption of autonomous agents is the new key to productivity. However, scaling without control exposes companies to major security and cost drift risks. Hodor.ai bridges this gap by becoming the indispensable governance layer for your agent fleets.The MissionWe enable companies to move from prototype to mass deployment by securing the agent ecosystem. Through our Agentic ID technology, we transform autonomous black boxes into identifiable, responsible, and audited digital collaborators.Added Value & Key FeaturesUnique Digital Identity: Assigning a cryptographic identity to each agent to secure Machine-to-Machine interactions.Granular Control (RBAC for AI): Defining strict usage policies to govern execution capabilities and access to sensitive data.Secure Scaling: Real-time monitoring of agent consumption and actions to prevent any aberrant or costly behavior.Governance & Compliance: A centralized dashboard to monitor "who did what" within your AI infrastructure.Techs:- golang- NextJS- python- scaleway PaaS - Wast'OFounding engineer & AI — GreenTech Solution (IoT & RAG)ENVIRONMENTALNovember 2025 - Today (7 months)Paris, France
📍 AI Engineer & Cloud Architect | GreenTech Solution (Sovereign)
How to automate complex selective sorting via AI without compromising data sovereignty? For Wast’O, I designed a complete European ecosystem (IoT & AI), capable of moving from POC to industrial scale in record time.The challenge was to eliminate AI hallucinations while ensuring a Green IT infrastructure. My intervention focused on two pillars:AI Engineering (RAG):Deployment of a highly reliable conversational assistant that queries regulations in real-time. Dynamic data sourcing for 100% accuracy.Performance & Sovereignty:Serverless Architecture on Scaleway for on-demand scalability, minimizing both carbon footprint and Cloud Burn (FinOps).As Founding Engineer, I secured the overall technical roadmap:Critical Backend:Development of high-performance APIs (Node/PostGIS) for collection zone geofencing.IoT Hub:Centralization and real-time monitoring of connected sensor streams.Optimization: Halving maintenance costs through a unified architecture (React Native / TS).Result:A robust, RGPD-compliant by design solution, ready for national deployment.Tech Stack mastered on this project:AI: RAG (Sovereign LLM), Vector Search.Backend: NestJS, Golang (internal tools), PostGIS.Infra: Scaleway Serverless, GitHub Actions (CI/CD).Mobile: React Native (Single iOS/Android/Web Codebase). - MiKozFounding engineer &AI & Fullstack Engineer | Mi Koz: EdTech Ecosystem powered by SLMEDUCATION AND E-LEARNINGFebruary 2026 - Today (4 months)Saint-Denis, Réunion
📍 AI & Fullstack Engineer | Mi Koz: EdTech Ecosystem powered by SLM (WASM & Rust)
How to offer a high-fidelity conversational AI in Creole without relying on cloud giants? With Mi Koz, I deployed a learning platform whose intelligence comes from specialized language models (SLM) and a high-performance audio studio.The innovation lies in a unique vertical integration of AI:Specialized Intelligence (SLM):Use of small language models (Small Language Models) specifically trained via my L2S engine. This approach guarantees total linguistic accuracy (French/Creole) and optimized execution, far from the costs and biases of generalist models."Edge" Audio Processing (WASM/Rust):To ensure perfect responsiveness, I developed an audio mixing engine in Rust/WebAssembly that runs directly in the browser, coupled with a React Native application.Sovereign Infrastructure:Complete pipeline on Scaleway (S3/Serverless) ensuring communication confidentiality and on-demand scalability.This project is proof by example of my value as a Founding Engineer:Data Cycle Mastery:Ability to create one's own datasets to feed proprietary SLMs.Systems Expertise:Successful marriage between low-level (Rust, WASM) and modern cloud architectures.Technological Independence:Design of solutions capable of running locally or on sovereign cloud, outside of proprietary silos.Mi Koz is not just an application, it's a show of force: cutting-edge AI, mastered from raw data to the user interface.
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Education
- Tech Lead / Title Level 7 / Master's DegreeOpenclassrooms2019Gestion de projets Management d'équipes Etude et développement d'applications et d'infrastructures Etude de migrations
- Web DeveloperOpenclassrooms2016Développement d'applications Front-end Développement d'applications N-tiers
Certifications
- Launch your own websiteOpenclassrooms2020
- PHP / Symfony Web DeveloperOpenclassrooms2016