Full-Stack Engineer · Paris

00About

Engineer, end to end.

Hi, I'm Sébastien — a full-stack engineer based in Paris, shipping React, Next.js and React-Native products end-to-end as a freelance engineer, from first mockup to production.

Contact me on LinkedIn
01Skills

What I work with

  • JavaScript
  • TypeScript
  • Java
  • Swift
  • Kotlin
  • C#
  • Python
  • Ruby
  • SQL
  • React
  • React Native
  • Expo
  • Next.js
  • Tailwind
  • Apollo / GraphQL
  • Three.js
  • Spring Boot
  • Ruby on Rails
  • Nest.js
  • Node.js
  • REST
  • Firebase
  • MySQL
  • AWS
  • GCP
  • Shopify
  • Jenkins
  • Git
  • Linux / Shell
  • BLE / Arduino
  • Mistral AI
  • French (native)
  • English (TOEIC 950)
  • Spanish
  • Mandarin (basics)
02Experience2 ROLES

Where I've worked

  1. 2020 — Present · Paris

    Freelance

    Full-Stack Engineer

    End-to-end frontend ownership across multiple side engagements. Flagship: PassCE — web app + Expo mobile app for a corporate benefits platform reaching 10,000+ daily users.

    • React
    • React-Native
    • Expo
    • Firebase
    • Tailwind
    • TypeScript
  2. Mar 2020 — Sep 2020 · Paris

    Crédit Agricole Technologies & Services

    Software Engineer

    Software engineering inside the bank's internal technology division. Backend and frontend work on banking applications.

    • Java
    • MySQL
    • JavaScript
    • HTML
    • CSS
03Education

Education

  1. Software engineering school

    EFREI Paris

    Software Engineering — MSc

    Paris, France
  2. Image processing & Artificial intelligence

    Universitat Politècnica de Catalunya

    Image Processing & Artificial Intelligence — Exchange

    Barcelona, Spain
  3. Software & data engineering

    Concordia University

    Software & Data Engineering — Exchange

    Montreal, Canada
04IntelligenceLLMS · RAG · RL

Building with AI

I build AI-powered products end-to-end — integrating LLMs and retrieval-augmented generation into real apps, plus hands-on work in reinforcement learning and image processing.

  1. LLMs & RAG

    Building retrieval-augmented generation into full-stack products — grounding language models in real data.

  2. Reinforcement Learning

    Agents that learn from interaction, improving their policy through reward and feedback over time.

  3. Computer Vision & AI

    Image processing and applied AI — from classical pipelines to learned models.

A scripted, front-end demo assistant — no live model, just a quick way to explore my work.

05Cities3 PLACES · 3 COUNTRIES

Where I've been

WorkStudies

  • Montreal

    Canada

    2019 – 2020

    Exchange · Concordia University

  • Paris

    France

    2020 – Present

    Freelance Full-Stack Engineer

  • Barcelona

    Spain

    2021 – 2022

    Exchange · Universitat Politècnica de Catalunya

06Contact

Get in touch

I'm always open to interesting projects and conversations. Reach out and let's build something.