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Jon HualdeJH

Jon Hualde

React/Next Developer + QA | TypeScript | Testing

€470/day
Biarritz, FR
3-7 years
React.js
Typescript
Next.js
Playwright
E2E Tests

Average response time: 1 hour

Freelancer profile translated to English.
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About Jon

I develop React/Next.js interfaces while ensuring their quality through comprehensive E2E test coverage. For smooth releases and less technical debt.

⚡ WHAT I DELIVER

→ React/Next.js Frontend Development
Modern interfaces with TypeScript, TailwindCSS, reusable components

→ Integrated Testing from Development
E2E Tests (Playwright/Cypress), Unit Tests (Jest), automated smoke tests

→ Robust Component Architecture
Design systems, reusable libraries, maintainable and documented code

→ CI/CD Integration
Automated tests in the pipeline, immediate feedback on PRs

→ Guaranteed Quality
Each feature delivered with its test suite, fewer bugs in production

🛠️ MY TECHNICAL STACK

Frontend: React, Next.js, TypeScript, TailwindCSS
Testing: Playwright, Cypress, Jest, Vitest
Tools: Figma, Git, GitHub Actions, Linear

✅ WHY WORK WITH ME

- Dual expertise: frontend development + QA automation
- Tested and documented code from delivery
- Pragmatic approach: focus on value and quality
- 5+ years of experience

📩 NEXT STEP

Send me a message with a brief description of your project.
I'll reply within 24 hours.
Banking and Financial Services
E-commerce
Software Publishing
Digital and IT Services
Education Companies

  • French

    Native or bilingual

  • English

    Fluent

  • Spanish

    Fluent

  • Portuguese

    Basic

Can work on-site
Biarritz (up to 50km), Paris (up to 50km), Bordeaux (up to 50km), Marseille (up to 50km), Lyon (up to 50km)

Experience

  • FOUNTAIN
    Frontend Developer & QA Automation Engineer
    HUMAN RESOURCES
    August 2024 - October 2025 (1 year and 2 months)
    Paris, France
    Recruitment SaaS platform: development of React interfaces and test automation to ensure quality and velocity of the product team.

    MISSIONS

    - Development of user interfaces with React, TypeScript, and TailwindCSS
    - Creation and maintenance of the application's design system
    - Complete E2E test architecture with Playwright
    - Development of smoke tests for post-deployment validation
    - Integration of tests into the CI/CD pipeline via GitHub Actions
    - Close collaboration with developers and the QA team

    ACHIEVEMENTS

    - Reusable React components for HR modules
    - E2E testing framework covering critical user journeys
    - Unit tests with Jest for each component
    - Improved testability of frontend code
    - Complete technical documentation

    RESULTS

    - E2E coverage increased by 60%
    - Significantly reduced release validation time
    - Maintainable and documented frontend code

    STACK: React, TypeScript, TailwindCSS, Playwright, Jest, GitHub Actions, Linear, Figma
    Playwright Typescript JavaScript React.js E2E Tests
  • Santander Consumer Finance
    ReactJS Frontend Developer | Typescript
    LOGISTICS AND SUPPLY CHAIN
    March 2023 - August 2024 (1 year and 5 months)
    Madrid, Spain
    Development of web interfaces for financial products with a focus on quality, testing, and optimal user experience.

    MISSIONS

    - Development of user interfaces with ReactJS and TypeScript
    - Creation of responsive designs with TailwindCSS
    - API integration with Axios and React Query
    - Implementation of unit tests with Vitest
    - End-to-end tests to maintain a high level of quality
    - Faithful reproduction of Figma designs
    - Collaboration in AGILE methodology

    ACHIEVEMENTS

    - New pages and features for financial products
    - Clean and maintainable frontend codebase
    - Efficient frontend-backend integration
    - Complex forms with React Hook Form and Zod validation
    - Consistent user experience across all devices

    RESULTS

    - Responsive and intuitive interfaces improving user engagement
    - High level of reliability thanks to systematic testing
    - Rapid adaptation and continuous improvement in agile methodology
    - Documented code facilitating maintenance

    STACK: ReactJS, TypeScript, TailwindCSS, Axios, React Query, Vitest, Vite, React Hook Form, Zod, ESLint
    Typescript React JavaScript Vite TailwindCSS
  • EOVO - Plateforme d'investissement
    ReactJS Frontend Developer | Next.js | TypeScript
    LOGISTICS AND SUPPLY CHAIN
    April 2022 - September 2022 (6 months)
    Biarritz, France
    Development and optimization of web applications with a focus on quality, performance, and security.

    MISSIONS

    - Creation of a reusable component library with Next.js and TailwindCSS
    - Development of interfaces with TypeScript and Next.js
    - Implementation of secure authentication with JWT tokens
    - Form validation for data quality
    - End-to-end tests with Cypress and Playwright
    - Unit tests with Jest
    - Pixel-perfect integration of Figma designs

    ACHIEVEMENTS

    - Reusable component library facilitating design consistency
    - Next.js application with advanced features
    - Secure authentication system
    - Complete suite of E2E and unit tests
    - Feature-by-feature deployment with Git in AGILE methodology

    RESULTS

    - Improved user experience and overall performance
    - Rapid detection and resolution of issues thanks to testing
    - Improved design consistency and maintainability
    - Reduced production risks and costs

    STACK: Next.js, TypeScript, React.js, TailwindCSS, Cypress, Playwright, Jest, NestJs, Prisma, Figma
    TailwindCSS Next.js Typescript React.js Cypress
Check out Jon's experience

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Certifications

Skill set

JavaScript
Node.js
Vue.js
redux-saga
Webpack
GraphQL
MySQL
PostgreSQL
Docker
Jest
Cypress
TailwindCSS
HTML5
Communication
Project Management
Git
Web Development
REST API
React Query
OpenAPI
Clean Code
Front End Interface Development
External API integration
Testing and Quality Assurance
Github Actions
Quality Control
react hook form
React
Vite
Prisma
redux
Figma
twig
AWS Lambda
Material UI
Apollo
NestJs
Front-End Development

Categories