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Sylvain YnerSY

Sylvain Yner

Fullstack Developer

€550/day
Lille, FR
8-15 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Sylvain

After 3 years with a multinational company and 4.5 years in an agtech startup as a developer, my area of expertise is quite broad:

- Understanding and analyzing needs
- Front-end development of applications and web page integration
- UI and UX development in Responsive Design
- Unit tests, integration tests, and end-to-end tests
- Implementing a design system (Styleguidist/Storybook)
- Internationalization (i18n)
- Setting up tracking (Mixpanel/GA)
- Setting up accessibility
- Knowledge of architectural principles and application design
- Knowledge of Figma & Zeplin
- Knowledge of continuous integration workflows (Gitflow)

Stack:
- ReactJS (Hooks, Patterns, Performance, Suspense)
- Typescript
- Redux
- StyledComponent
- Storybook
- NestJS
- NextJS
- Prisma
- CapacitorJS

Attentive to client needs, I am capable of proposing and providing solutions to raised problems. I am available for any project request, do not hesitate to contact me, I will provide you with a response as soon as possible.
  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Conversational

Can work on-site
Lille (up to 50km), Paris (up to 10km)

Experience

  • Sencrop
    Front-End Developer
    INTERNET OF THINGS (IOT)
    January 2019 - August 2023 (4 years and 8 months)
    Lille, France
    Analysis and development of features from front-end to back-end
    Updating and using a design system
    Setting up tracking (Mixpanel)
    Setting up feature flags (Rollout)

    User research
    Deployment of the application on iOS, Android, and Desktop (Bitrise/Netlify)

    Application translation (i18n)
    TDD, Hexagonal Architecture

    Stack: ReactJS, Redux, Typescript, NestJS, Prisma, NextJS, Styled Component
    Tools: Zeplin, Figma, Trello, Miro
  • IBM Services center
    Developer
    AVIATION AND AEROSPACE
    June 2015 - September 2017 (2 years and 3 months)
    Lille, France
    Project 1: European university program platform for a private group
    Agile Scrum, 2-week sprints. Team of 6 people.
    Duration: 8 months
    Development:
    • Development of the user interface (UI) in conjunction with the designer
    • Ensuring responsive front-end design
    • Linking the front-end with a CMS (KeystoneJS)
    • Demo with the client
    • Estimation of front-end tasks

    Angular, JADE, LESS, GIT, NPM, Node.JS, Visual Studio Code, IBM Bluemix, KeystoneJS

    Project 2: WEB application for an aeronautics client
    Agile and V-Cycle. Team of 8 people.
    Duration: 1.5 years
    Development:
    • Analysis and development of front-end tasks
    • Use of d3.js
    • Defect resolution
    • Code improvement and refactoring
    • Estimation and task distribution with the rest of the team

    HTML, SAAS, JS, JS MVC, IBM RTC

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