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Sylvain LagardeSL

Sylvain Lagarde

Data Engineer | Python & AI | Pipelines & LLM

€500/day
2 projects
Marseille, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sylvain

Data-oriented Python developer, I help companies structure, analyze, and leverage their data.

I work across the entire data lifecycle:

- Task and Python script automation
- Data collection and integration via API
- Data pipeline creation (ETL / ELT)
- Database design (PostgreSQL)
- Process automation
- Data analysis and provision of key indicators

Beyond the technical aspects, I focus on understanding your business challenges to produce analyses that aid decision-making (performance tracking, segmentation, operational indicators, etc.).

I also work on light Machine Learning cases when they bring real value.

Objective: Transform your data into concrete tools to drive your business.

Approach: Pragmatic, results-oriented, with a strong focus on quality and maintainability.
  • Spanish

    Conversational

  • English

    Fluent

  • French

    Native or bilingual

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

Experience

  • Sapiologie
    Web Developer Internship
    January 2021 - January 2022 (1 year)
    Planning, management, and execution of a web development project on a web app built in Elixir / Phoenix Liveview. Learning about Life Cycle Analysis for products mainly from industry.
    Python ETL Processes Data Cleaning and Preprocessing Algorithms and Data Structures Data Integration
  • Sapiologie
    Machine Learning Engineer Internship
    January 2022 - January 2024 (2 years)
    Implementation of a large number of features using LLMs (Prompting, parsing, and automation). Management and execution of Machine Learning and Data Science projects. End-to-end project realization, including data engineering / data analysis and deployment on a launched web app. Implementation of calculation methodologies, including analysis, recalculation, and development of the application's rendering.
  • Revealead
    Freelance Data Engineer
    January 2025 - January 2026 (1 year)
    Marseille, France
    Design and development of data collection and transformation pipelines. Automation of workflows (ETL) and orchestration of processes. Data provision via secure API.
    ETL Processes Automation Data Engineering API Data Pipeline

Reviews

5.0

Out of 2 ratings

C

César

CEO - Revealead SAS

Reviewed on 5/16/2026

A second excellent collaboration with Sylvain. Very rigorous, an excellent developer, and possesses very good project management skills. I highly recommend him!
C

César

CEO - Revealead SAS

Reviewed on 4/16/2026

Excellent collaboration with Sylvain on this project! A very good developer, rigorous, autonomous, and proactive. He quickly understood the technical and business challenges and proposed effective, well-structured solutions. The code quality is excellent, with real attention paid to performance and maintainability. Communication was fluid throughout the project, with clear and regular exchanges. Deadlines were perfectly met, even anticipated. I highly recommend Sylvain for any project involving data, pipelines, or Python/AI development.

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Education

  • Web and Mobile Developer, Machine Learning Engineer
    Développeur web et mobile Ingénieur machine Learning
  • Preparatory class for mathematics and physics
    classe prepa math physique

Skill set

Categories