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Jason GreffierJG

Jason Greffier

Data Scientist

€600/day
1 project
Nantes, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Jason

💡 Expert Data & AI – I automate your processes, leverage your data, and make AI accessible to your business.
Do you have untapped data? Repetitive tasks to automate? A need to concretely integrate AI into your operations?

🎯 I help you transform your data into performance drivers.
✅ What I do for you:
  • Automation of time-consuming tasks: PDF extraction, Excel formatting, data integration from sensors or SQL databases.
  • Business-oriented AI models: classification, prediction, time series, deep learning, based on your real use cases.
  • Visualization & KPI monitoring: dynamic dashboards (Power BI, Looker, Streamlit) for quick decision-making.
  • Custom AI Assistants: intelligent chatbots capable of directly answering your questions from your own documents (NLP, LLM, RAG, Embeddings).

🔍What I bring to you:
✔️ Solid expertise (5 years) on concrete, ROI-oriented data projects
⚡ Quick start
🤝 Tailored support: I adapt to your pace and your tools
💬 Clear communication: I demystify AI concepts for your teams

Looking for a profile capable of understanding your business challenges, delivering reliable technical solutions, and saving you time through data and AI? Let's talk.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • 4CAD Group
    AI Architect
    January 2026 - Today (7 months)
    Definition of the group's LLM strategy and management of the data team.
    🎯 Objective: position 4cad Group as a sovereign player in its data by arbitrating between On-Premise solutions and Cloud APIs.
    ➡️ Comparative benchmarks of LLMs (On-Premise vs Cloud) to evaluate performance, cost, and GDPR compliance — delivery of a strategic arbitration report to the COMEX.
    ➡️ Architecture of clustering solutions for the automotive sector, aimed at optimizing industrial production flows.
    ➡️ Technical supervision and mentorship of a Data Scientist and an intern: code reviews, sprint planning, skill development.
    Team Management LLM Clustering Data science Numerical Simulation
  • Schmidt Groupe
    Freelance Data Scientist
    September 2025 - December 2025 (3 months)
    End-of-month commercial landing prediction model for sales management.
    🎯 Objective: enable sales teams to anticipate performance gaps mid-month and adjust actions in real-time.
    ➡️ Development of a Time Series model using XGBoost, trained on sales history to accurately predict monthly landing.
    ➡️ Design of custom Scikit-Learn pipelines with custom transformers to industrialize and ensure the reliability of preprocessing.
    ➡️ Delivery of a production-ready solution, directly usable by teams without technical intervention.
    Python XGBoost Time Series Scikit-learn Forecast
  • Université
    Data Scientist & AI Mentoring: RAG Chatbot for Biomedical Research
    MEDICAL
    June 2025 - July 2025 (1 month)
    Nantes, France
    ➡️ Mentoring a PhD student in designing an intelligent chatbot capable of extracting and retrieving scientific information from research documents.
    ➡️ Implementation of a RAG (Retrieval-Augmented Generation) architecture: document vectorization, FAISS index database, LLM integration via Langchain.
    ➡️ Methodological framework, code review, and weekly technical support (Python, NLP, embeddings, Flask).

    🎯 Objective: facilitate access to medical knowledge within the scope of a biomedical sciences thesis.
    Python RAG LLM AI Chatbot NLP

Reviews

5.0

Out of 1 rating

Z

Zainab

jj

Reviewed on 6/30/2025

Very satisfied with this support 👍 Jason was extremely organized, always smiling, and very friendly. He perfectly understood my needs from the start and provided invaluable help in structuring my project. His methodical approach and kindness truly made a difference. I highly recommend his services.

Recommendations

ZB
SM
TD
Zainab Belghali and 2 other people have recommended Jason

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Education

  • Machine Learning Engineer
    OpenClassroom
    2021
    Ingénieur Machine Learning
  • Structural Engineer
    Université Laval
    2015
    Ingénieur

Certifications

  • Google Analytics
    La fusée
    2022
    Google Analytics Matomo Paid Media GA4 Universal Analytics Marketing
  • Responsible Digital
    ManagExam
    2025
    Sustainable Development Responsible Digital Eco-design CSR Consulting

Skill set

Categories