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Ambroise PetitjeanAP

Ambroise Petitjean

Senior Software Engineer Python | JS | GO | Rust

€880/day
Paris, FR
8-15 years

Average response time: 1 hour

About Ambroise

Engineering leader with 15+ years building complex applications and AI systems at scale. My career spans the evolution from Big Data to modern ML/AI, giving me unique perspective on architecting production systems.
I architect and deliver complex technical solutions for enterprise clients including LVMH, L'Oréal, and major financial institutions, combining deep data engineering expertise with modern full-stack
development.
I excel at leading technical teams through complex migrations and greenfield projects, from clusters at major banks to LLM-powered applications on GCP. Equally comfortable writing production code or mentoring engineers to elevate their craft.

Please feel free to contact me if you have further questions.
  • English

    Native or bilingual

  • French

    Native or bilingual

  • German

    Fluent

  • Swedish

    Conversational

Can work on-site
Paris (up to 10km)

Experience

  • Koala Academy
    Co-Founder & CTO
    EDUCATION AND E-LEARNING
    July 2025 - Today (11 months)
    Paris, France
    Founded innovative AI-powered language learning platform revolutionizing pronunciation training through personalized experiences and cutting-edge artificial intelligence technologies. Leading technical development and product strategy for next-generation educational technology.

    - React Native, AstroJs
    - LLM finetuning, Local LLMs, RAGs and MCP
    - Webassembly in Rust

    React Native Rust Kubernetes MCP LLM Fine-tuning
  • L'Oréal
    Lead Tech & Digital Solutions Architect
    E-COMMERCE
    November 2024 - July 2025 (8 months)
    Paris, France
    Leading digital transformation initiatives for the world's largest beauty company, architecting scalable e-commerce platforms and next-generation product data infrastructure to support global beauty retail operations across multiple brands and markets.

    Fullstack for the e-commerce platforms ( React / Tailwind / Nodejs /
    DDD Hexa architecture ).
    Back-End Developper for the new Product API ( GCP / Workflows /
    Redis / Python / dbt / Bigquery )
    GCP DBT Typescript React.js Node.js
  • Carbon Maps
    Lead Tech & AI Engineer
    ENVIRONMENTAL
    May 2024 - November 2024 (6 months)
    Paris, France

    Led technical architecture and AI implementation for carbon footprint mapping solutions, driving innovation in environmental technology through advanced data engineering and machine learning capabilities.

    Back-End Developer API (Python / GCP/ Airflow / Cloud run Jobs /
    Cloud Build / Bigquery / Mongo).
    LLM engineer: implemented the LLM data flows and MVP ( Python /
    OpenAI/ Huggingface ).
    Python (Programming Language) LLM Big Query Apache Airflow Cloud GCP

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Education

  • Grade Master
    Montpellier Business School
    2012
  • B.Sc
    Mannheim Universität BWL
    2009
    Exchange Student

Skill set

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