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Simon StefaniSS

Simon Stefani

Senior Fullstack Developer

€630/day
Paris, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Simon

JavaScript fullstack developer with a strong appetite for product and user experience. I have a solid knowledge of the JavaScript ecosystem (React, Next.js, Node.js, GraphQL, Apollo, Redux) acquired on international projects. Used to working on complex architectures, I enjoy contributing to technical decisions and product design in collaboration with design teams.
  • French

    Native or bilingual

  • English

    Fluent

Can work on-site
Paris (up to 50km), Paris (up to km), Boulogne-Billancourt (up to km), Neuilly-sur-Seine (up to km), Sèvres (up to km)

Experience

  • Hermès
    Senior Fullstack Developer
    LUXURY GOODS
    September 2025 - Today (9 months)
    Paris, France
    Development and maintenance of features for Hermès' back-office, for sales assistants, in collaboration with multiple backend teams
    Implementation of address search and validation via DQE
    Development of the design system for numerous applications, with accessible components
    Technical update of the design system and client applications (React 19, Vitest, React Compiler)
    Technical environment: React - TypeScript - Tailwind - Node.js - Vite - Vitest Playwright – Cypress - TanStack Query - Codex / Cursor - GitLab - Storybook - Figma
    Node.js TypeScript Git React.js
  • Eren Groupe S.A.
    Fullstack Developer / Project Manager
    May 2023 - Today (3 years and 1 month)
    Design, development, and evolution of several showcase websites dedicated to renewable energy and health for Eren Groupe.

    Technical environment: NextJS - Material-UI - Tailwind - Typescript - Strapi - Cursor/Codex - Vercel - SEO - Figma - Figma MCP server
    Next.js TypeScript JavaScript Responsive Integration
  • Christian Dior Couture
    Senior Fullstack Developer
    LUXURY GOODS
    June 2021 - July 2025 (4 years and 1 month)
    Responsible for the overall management of the "My Account" application: updating personal information (password, addresses, social connectors).

    Management of orders, returns, and exchanges in over 40 countries, with integration of delivery and return services (over 10 carriers, various services: standard, premium, pickup point, etc.).
    Management of invoices and documents specific to local legislation according to countries.

    Implementation of internationalization, including right-to-left (RTL) interface management for Arabic-speaking countries.

    Design and development of an omnichannel wishlist, synchronized with physical stores, compatible in connected and guest modes (persisted via Apollo GraphQL client cache).

    Contribution to the creation of the Dior design system and complete migration of the application to this new design system.

    Involvement in product thinking, close collaboration with UI/UX teams via Figma.

    Frequent interventions on the gateway and Apollo Federation modules for data aggregation, transformation, and connection to all types of e-commerce services (carriers, order management, stock, etc.).

    Development of social connectors adapted to the specific uses of different countries.

    Technical environment: React - NextJS - Typescript - Node.js - Material-UI - Storybook - Jest - Lodash - Sass - Apollo Client - Apollo Server - Jest - GoogleMap API - Github - Scrum/SAFE - JIRA
    TypeScript Node.js Apollo GraphQL Next.js

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