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Christophe BajanCB

Christophe Bajan

Data Scientist ML & AI

€550/day
Grenoble, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Christophe

Do you have data from experiments, simulations, or existing processes, but are unsure about the next trials or the best decisions to make?

I help companies and project teams leverage their data using data science and machine learning algorithms to analyze existing results and intelligently suggest the next actions to take.

As a freelance data scientist and machine learning expert, I address concrete problems such as data analysis, predictive modeling (regression, classification), and the use of optimization algorithms to propose new areas of exploration, parameters, or scenarios to test.

My added value lies in a pragmatic, decision-oriented approach: working with real-world data (often noisy or incomplete), using algorithms to guide choices rather than relying on intuition, and delivering understandable results that can be directly used by non-technical teams.

I typically work on projects such as:
- Analysis of experimental or operational data
- Predictive models to anticipate performance or behaviors
- Suggestion and optimization algorithms to define the next trials or parameters to explore
- Audit and improvement of existing data pipelines
- Methodological support to help teams structure a data-driven approach

Deliverables are tailored to the project context: reproducible Python notebooks or scripts, clear visualizations, written summaries, and concrete recommendations to guide future work.

I undertake both targeted missions and longer-term collaborations, working closely with technical or business teams.
  • French

    Native or bilingual

  • English

    Fluent

  • Japanese

    Basic

Can work on-site
Grenoble (up to 50km)

Experience

  • NATIONAL INSTITUTE FOR MATERIALS SCIENCE
    MACHINE LEARNING RESEARCH ENGINEER
    RESEARCH
    June 2022 - December 2025 (3 years and 6 months)
    Tsukuba, Ibaraki Prefecture, Japan
    • Development of MADGUI, a Python graphical interface for Bayesian optimization and active learning model construction for materials design and process optimization.
    • Conducted comparative analyses of Large Language Models (LLMs) applied to materials science.
    • Created a multi-agent system based on CrewAI designed to serve as a research assistant in materials science, integrating LLMs (Phi, Llama, Mixtral) with RAG pipelines.
    • Daily use of PyTorch, HuggingFace, Scikit-learn, TensorFlow, and Llama-index.
    • Experience in data cleaning (SQL), feature engineering, and model evaluation pipelines.
    • SEM image analysis, property modeling, and simulation using OpenPNM and PoreSpy.
    Machine learning Agentic AI Data Scientist LLM Data science Process Optimization
  • SETEC EOCEN (CEA SACLAY)
    PMO ENGINEER
    ENERGY AND UTILITIES
    May 2021 - June 2022 (1 year and 1 month)
    France
    • Managed budgets and risks for 11 nuclear decommissioning projects at the CEA Saclay site.
    • Developed project schedules and risk analyses using MS Project, Excel, and visual dashboards with various project managers.
    • Performed critical path and financial variance analyses.
    Microsoft Project Risk Analysis Project Management PMO Microsoft Excel
  • ALTEN (GROUPE PSA)
    LI-ION BATTERY TESTS ENGINEER
    AUTOMOBILE
    May 2019 - October 2020 (1 year and 5 months)
    France
    • Planned and executed tests on Li-ion batteries (charge/discharge cycles, thermal behavior, aging).
    • Analyzed data using EC-Lab, Matlab, and internal PSA software.
    • Collaborated with engineers on electrical test protocols.
    • Set up and used various sensors to monitor battery status.
    • Performed work on 3 different types of battery cells (pouch, cylindrical, and prismatic) as well as battery modules.
    Microsoft Excel Battery Electric Vehicles Planning Engineering

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Education

  • Master's degree
    Université Paris-Saclay
    2017
    Master en
  • Bachelor's degree in Physics and Chemistry
    Université Paris-Saclay
    2014
    Licence en Physique et Chimie

Skill set

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