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Guillaume Q.GQ

Guillaume Q.

Lead DS / ML Eng. | GenAI |Fraud Detection Expert

€900/day
Paris, FR
3-7 years

Average response time: 1 hour

About Guillaume

I’m a Machine Learning Engineer specialized in Fraud Detection, Generative AI, and MLOps. I help businesses and institutions transform complex data into scalable, secure, and high-performing AI systems — from idea to production.

I developed and put in production solutions for big players in the retail, banking, pharmaceutical and consumer electronics industries.

Whether you're looking to build a fraud detection engine, deploy a GPT-powered assistant, or automate your machine learning pipelines, I bring 5+ years of experience delivering real-world, high-impact solutions in production environments.

Core Skills:
GenAI / LLMs (GPT-4, LangChain, RAG systems) – Extraction, classification, and search over unstructured data (PDFs, websites, CRMs).

Fraud Detection (AML, card fraud, anomaly detection) – Supervised & unsupervised ML to detect novel fraud patterns. XGBoost, Unsupervised Clustering (HDBScan + UMAp), Isolation Forests...

MLOps & Deployment – CI/CD, FastAPI, Docker, MLflow, on GCP, Azure, and on-premise servers.

Highlights:
- Developed a GenAI content tagging engine for a pharmaceutical group (20,000+ documents, 9 languages).

- Developed multiple GenAI medical writing automation for a pharmaceutical group.

- Designed and deployed in production Fraud Detection models for 2 major banks.

- Led the creation of a GPT-based classifier for fraudulent websites.

- Built machine learning pipelines on GCP, Azure, and on-premise, ensuring scalability and GDPR compliance.

Let’s connect if you need an expert who can understand your business, navigate your tech stack, and deliver real results — fast and reliably.
  • French

    Native or bilingual

  • English

    Native or bilingual

  • Spanish

    Fluent

Remote only
Primarily works remotely

Experience

  • Artefact
    Senior Data Scientist
    CONSULTING AND AUDITS
    May 2021 - Today (5 years and 1 month)
    Paris, France
    Fraud Detection (Banking) – Designed and deployed a real-time fraud detection pipeline (PySpark + XGBoost) handling tens of thousands of transactions/day, preventing +40% fraud losses/year.

    Generative AI (Pharma & Telco) – Built scalable GenAI pipelines (LangChain, LangGraph, Weaviate) for document processing and website risk classification, reducing manual effort by >70%.

    Causal ML (Retail) – Delivered a CLTV causal inference platform (DoubleML) analyzing 12M+ customers, rolled out across 24+ markets, improving marketing ROAS by +61%.

    MLOps & Industrialization – Architected end-to-end ML pipelines (GCP Vertex AI, Hadoop, Kubernetes, Terraform) with monitoring, CI/CD, and production rollout at scale.
    Google Cloud Platform (GCP) Gemini OpenAI XGBoost ML Engineer
  • MBDA
    Ingénieur prototypage en Intelligence Artificielle
    January 2020 - July 2020 (6 months)

    • Etude de l'état de l'art en Deep Reinforcement Learning.
    • Prototypage d'une intelligence artificielle capable de déterminer un parcours d'exploration optimal par Deep Renforcement Learning (PPO) à partir de données de simulation de grande dimension.
  • Simpliciti
    Stagiaire chef de projet et support stratégie Data
    SOFTWARE PUBLISHING
    July 2019 - January 2020 (6 months)
    Avignon, France
    • Conception et développement d'une plateforme de traitement et de visualisation des données clients.
    • Développement d'algorithmes de détection d'erreurs et de prédiction sur des jeux de données importants.
    • Etude des cas d'usages de l'intelligence artificielle aux besoins de l'entreprise.
    • Assistance au Directeur Général sur certains sujets data ados.

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Education

  • Programme Grande École
    CentraleSupélec
    2021
    Programme Grande École - Spécialisation en IA
  • Master of Management
    ESCP Europe
    2021
    Master in Management, Economie et Management

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