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Adrien KowalczykAK

Adrien Kowalczyk

Freelance full-stack web developer

€500/day
Lille, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Adrien

Freelance React / TypeScript developer with 6+ years of experience, I support teams on complex business applications (data visualization, advanced forms, workflows).
I work independently on end-to-end features, from front to back (.NET), with a focus on performance, maintainability, and user experience.
Quickly operational, I integrate easily into multidisciplinary teams and collaborate effectively with product, QA, and back-end teams to deliver concrete and appropriate solutions.
  • French

    Native or bilingual

  • English

    Fluent

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

Experience

  • Freelance pour GETLINK Group
    Freelance web developer
    TRANSPORTATION
    March 2025 - March 2026 (1 year)
    Lille, France
    Freelance React / TypeScript developer with 6+ years of experience, I support teams on complex business applications (data visualization, advanced forms, workflows).
    I work independently on end-to-end features, from front to back (.NET), with a focus on performance, maintainability, and user experience.
    Quickly operational, I integrate easily into multidisciplinary teams and collaborate effectively with product, QA, and back-end teams to deliver concrete and appropriate solutions.
    React.js TypeScript Developer .NET GitHub Jira/Confluence
  • SFEIR
    Front-end developer
    TRANSPORTATION
    February 2023 - March 2025 (2 years and 1 month)
    Lille, France
    Application for collecting defects in the concrete rings of the Channel Tunnel and for creating associated work orders
    • Full development of the front-end interface: defect entry forms, ring visualization, work order management
    • Management of authentication and user roles · state management via Context API and React Query
    • Internationalization with i18n · light/dark theme management (Material UI dark/light theme)
    • Integration with back-end APIs (.NET / C#) · Docker containerization
    React.js TypeScript Developer GitHub Material UI .NET
  • Capitole Consulting
    Front-end developer
    E-COMMERCE
    September 2022 - February 2023 (5 months)
    Lille, France
    Period of skill development in advanced React technologies and modern front-end architecture
    • Next.js: routing, image optimization, Incremental Static Generation
    • Testing: React Testing Library, Jest Dom, Mock Service Worker
    • Micro-frontend architecture: Module Federation Plugin, microservices deployment on AWS S3
    • React best practices: linting, project structure, custom hooks, naming conventions
    Microservices Architecture TDD MongoDB React.js

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Education

  • React certification level 1
    React certification level 1
  • M2i training
    Afpa
    2018
    M2i formation

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