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Benjamin LesnéBL

Benjamin Lesné

Full-Stack Developer

€275/day
Lyon, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Benjamin

Full-Stack TypeScript Developer | React / Node.js Specialist

I build robust, maintainable, and well-tested web applications. My preferred stack: React, TypeScript, Nestjs, Vite, Tailwind.

I work on impactful projects (ecology, public sector), like recently where I developed a carbon visualization tool for the European Union commission. I also worked for 2+ years at LICA on a complex platform in Nest.js / React, with CI/CD, microservices, E2E tests, and documentation.

On the side, I contribute to open source, I read (a lot), and I run my YouTube channel “Juste le code” (youtube.com/@juste-le-code).
  • French

    Native or bilingual

  • English

    Native or bilingual

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

Experience

  • KU Leuven
    Full-Stack Developer / Product Engineer
    CIVIL ENGINEERING
    May 2024 - Today (2 years and 1 month)
    Project “Scenario Explorer”: interactive tool for visualizing the carbon emissions of the entire European building stock, while presenting different carbon reduction strategies. Carbon emissions can be visualized according to building life cycle analysis stages, building types, etc. This is the interface for the study named “Support Study for the Development of the Roadmap for the Reduction of Whole Life Carbon of Buildings”, funded by the European Union.

    Tasks completed:
    - I built everything, from backend to frontend
    - Development of a REST API to read and serve data from Parquet files
    - Data visualization with Recharts
    - Tested my code with Vitest and Playwright
    - Worked with a container-based CI/CD
    - Wrote documentation for users and developers
    - Collaboration with the UX/UI designer and the data team
    Apache Parquet Docker React.js TanStack Query Data visualisation
  • L.IC.A.
    Full-Stack Developer
    PUBLIC SECTOR
    January 2022 - May 2024 (2 years and 4 months)
    Marseille, France
    Project “Platform”: website for event management and candidate tracking. Several “child” applications derived from a “mother” application were created to meet different client needs (Réalise Tes Rêves, Marseille Capital de la mer, FFTDA, and many others!)

    Tasks completed:
    - creation of an internal library
    - update of the design system
    - writing documentation (user and technical) with Docusaurus
    - implementation of a WebSocket
    - responsible for CI/CD
    - I proposed and implemented:
    → end-to-end tests with Playwright, which reduced the bug rate per release by 40%!
    → a Gitlab pipeline reducing the total time needed between a bug fix and its deployment to production by 30%

    Playwright React.js Gitlab JavaScript Typescript

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Education

  • Web Developer
    Openclassroom
    2021

Skill set

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