You're seeing this page as if you were . The main menu is still yours, though. Exit from immersion
Matthieu De GoysMD

Matthieu De Goys

Ruby on Rails / React / Fullstack Web Developer

€350/day
Brest, FR
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
Back to original language

About Matthieu

With over 7 years of experience in developing and deploying web applications using various languages (PHP, JavaScript, Ruby), I can design, maintain, update, or add the next feature to your application.

I am committed to providing complete and robust solutions that stand the test of time and all configurations, on mobile, desktop, accessible to all browsers and for all visitors.

I have previously worked in start-up environments or on solo projects, managing development from start to finish, from idea to deployment and maintenance over many years. I would be happy to design solutions with you that work in terms of visibility and performance for years to come.
  • English

    Native or bilingual

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

Experience

  • Quiz-bac.fr
    Ruby on Rails / Fullstack Developer
    EDUCATION AND E-LEARNING
    July 2025 - Today (1 year and 1 month)
    Brest, France
    Development of a quiz application with Rails 8 and Hotwire (HTML over the Wire)
    - Generation of 35,000 questions with AI APIs (OpenAI, Mistral) and the RubyLLM gem
    - Screen change management with Hotwire: TurboFrame, TurboStream and Stimulus
    - User dashboard with history and statistics using advanced SQL queries (CTE, window functions)
    - 10x performance improvement on costly queries with memory optimization, response times under 300ms with 5,000 daily user responses
    Hotwire Ruby on Rails Stimulus OpenAI SQL
  • LITA.co
    Ruby on Rails / Fullstack Developer
    PRIVATE EQUITY
    March 2022 - June 2025 (3 years and 3 months)
    Paris, France
    Development (Ruby/Turbo/JS/ViewComponents) of features, including:
    ◦ synchronization of payment provider data
    ◦ automatic refund of campaigns with positive outcomes
    ◦ investments for restricted access campaigns
    Technical exploration with POCs on PWAs and importmaps
    Mentoring junior developers
    Bug fixing and flaky tests (monitoring Sentry/CI errors)
    PWA Ruby on Rails Rspec Amazon Web Services Mentoring
  • 20aubac.fr
    Ruby on Rails / Self-Employed Developer
    EDUCATION AND E-LEARNING
    February 2020 - February 2022 (2 years)
    Paris, France
    Creation/maintenance of the application (Rails 8/Hotwire/Tailwind CSS), including:
    - Text content exchange platform
    - Automated text processing for better content quality
    - Moderation via an admin interface
    - Full-text search engine with PostgreSQL
    - Integration of several payment solutions including Stripe
    - Tests with RSpec and end-to-end with Capybara
    Creation/maintenance of the simulator-bac.fr application:
    - Using React.js with TypeScript
    - Offered as a Progressive Web App (PWA), downloadable on mobile
    - Unit tests with Jest and end-to-end with Cypress
    - Deployments with Gitlab CI
    - Ranked number 1 on Google
    PWA React.js Ruby on Rails TailwindCSS Stripe

Recommendations

Be the first to recommend Matthieu

Help this freelancer shine by sharing your experience working together.

These freelancer profiles also match your criteria

AgathaA

Agatha Frydrych

Backend Java Software Engineer

4.7

(3)

2

BaptisteB

Baptiste Duhen

Fullstack developer

4.6

(4)

5

AmedA

Amed Hamou

Senior Lead Developer

4

(2)

7

AudreyA

Audrey Champion

Web developer

4.3

(3)

4

Education

  • State Title of Application Designer
    Simplon.co
    2018
    Titre d'État de Concepteur d'application
  • Intensive full-stack JavaScript training (React, Node.js) Degree
    EDHEC Business School
    2010
    Formation intensive full-stack JavaScript (React, Node.js) Diplôme

Categories