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Sébastien LempensSL

Sébastien Lempens

Creative Developer ReactJS/NextJS/ThreeJS

€590/day
Évian-les-Bains, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sébastien

I have been developing and designing websites and web applications for over 15 years. Thanks to my experience, I have had the opportunity to lead all types of projects: showcase sites, e-commerce (eshop), award-winning sites, intranets, SaaS applications, and much more.

Specializing in modern frontend (React, Next.js, Astro.js, TypeScript), 3D and WebGL (Three.js, React Three Fiber, shaders/TSL), and AI integration (RAG chatbots, LLMs, embeddings with Nomic, Gemini, ChromaDB, LlamaIndex), I bring advanced technical expertise to innovative projects.

I also work on web design/UI-UX and am proficient in headless CMS (Directus, Payload CMS, DatoCMS), Docker, GitLab/GitHub, as well as performance optimization and SEO/AEO.

Finally, I also infuse a strong creative value into my work to give my clients a competitive edge.
  • French

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Pixila
    Creative Developer for the San Rita Web Project
    November 2025 - March 2026 (4 months)
    Following a successful initial collaboration withStudio San Ritaon the 3D integration of a client project, the studio renewed its trust in me by entrusting me with the frontend development of their new website.

    I was responsible for the frontend development as well as the complete creation of the 3D experience: modeling in Blender, texturing with Adobe Substance 3D Painter, then WebGL integration with React Three Fiber.

    The backend part was done with DatoCMS.

    This achievement was awarded by several leading digital design platforms, including **Awwwards**, **CSS Design Awards**, and **FWA**.

    Website:
    react three fiber Next.js Blender three.js Awwwards
  • Pixila
    Creative Developer for the podium.global Project
    September 2025 - May 2026 (8 months)
    **Studio San Rita**, based in Montreal, contacted me to work on the WebGL part of their client Podium's new website.


    My role was to bring my expertise in creative development to design and integrate an interactive, dynamic, and web-optimized 3D experience.

    I worked with React Three Fiber for the WebGL integration, as well as with Blender for retouching 3D assets: UV mapping, texturing, optimization, and web export.

    This project was awarded the "Site of the Day" prize on FWA.

    Website:
    WebGL Blender react three fiber Awwwards three.js
  • Pixila
    Creative Designer / Developer for Studio Pixila
    August 2025 - April 2026 (8 months)
    I designed the complete digital identity for **Studio Pixila**, from logo creation to website launch.

    This personal project was an opportunity to build a strong, coherent brand image deeply connected to the studio's environment. Located in Bernex, in the heart of the Haute-Savoie mountains, Pixila draws natural inspiration from the alpine landscape, peaks, and local atmosphere. This universe guided the entire artistic direction, from the logo to the website's visual communication.

    The site was developed with Astro.js to ensure a fast and performant experience, while the 3D part was integrated in WebGL with React Three Fiber.

    This project was awarded on FWA.

    Website:
    WebGL Astro.js three.js react three fiber Awwwards

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