Freelancer profile translated to English.
Back to original languageAbout Ruben
Hello! I'm Rubén, a frontend developer with over 5 years of experience in React and Typescript.
I help startups and companies develop and maintain web applications, improving performance, reducing technical debt, and quickly integrating into existing teams.
I work with the complete ecosystem: Next.js, Zustand, TanStack Query, Tailwind CSS, and Storybook for design systems. I integrate AI (Claude) into my daily development, allowing me to deliver faster and with higher quality.
What can I do?
- Web applications with React: SPAs, applications with Next.js, responsive layouts, and reusable components with HTML, CSS, and JavaScript.
- API Integration: Consumption of REST APIs, connection with third-party services, and existing backends.
- Testing and CI/CD: Tests with Jest, React Testing Library, and Playwright. Automation with GitHub Actions, Git, and GitLab.
- Optimization: Improvement of web performance, accessibility (WCAG), and responsive design.
Why me?
I combine experience as a senior frontend developer in large teams with the agility of working as a web designer and solo web programmer. Agile and Scrum methodologies. Clean code, solid frontend architecture, and focus on maintainability.
Do not hesitate to contact me for your next web development project.
My stack
React / Next.js / Zustand / TanStack Query / Redux / TypeScript / JavaScript / HTML5 / CSS3 / Tailwind CSS / SASS / Storybook / Figma / Vite / Webpack / Jest / React Testing Library / Playwright / Git / GitHub / GitLab / CI/CD / REST API / Claude
Spanish
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- OptimissaSenior React Frontend DeveloperJuly 2025 - Today (1 year and 1 month)
- Participated in the development of a **corporate platform with over 30 thousand active users**, used for creating internal applications.
- Implementedreusable interfaces and components with React and TypeScript**, within a **microfrontendsenvironment.
- Appliedclean architecture and clean code principlesto ensure maintainability and scalability.
- UsedJestandTesting Libraryto ensure code quality through unit tests.
- Collaborated withbackend**, **UX/UI**, and **QAteams to optimize product **performance**, **accessibility**, and **visual consistency**.
- PTGSenior React Frontend DeveloperDIGITAL AND ITJuly 2021 - July 2025 (4 years)Madrid, Spain
- Led the development and maintenance of web applications usingReact.jsand **TypeScript**, ensuring clean, scalable, and high-quality code.
- Developed the company'scomponent library**, using **SASSfor styles and later initiating the migration toPostCSSto improve scalability and performance. Documented all components with **Storybook**, facilitating collaboration between design and development teams.
- Restructured the project architecture, replacing the container-based and presentational components pattern with a more efficientdesign patterncentered on **React Hooks**.
- Implemented UI state management using **Zustand**, improving performance and simplicity of data handling in complex applications.
- During the first stage of the project, I usedReduxfor server-side state management, and in the last year, I led the migration to **TanStack Query (React Query)**, which allowed for simplifying data logic, implementing advanced cache management, automatic revalidation, and efficient data synchronization by consuming **RESTful APIs**.
- Implemented and managedunit testsandE2E testsusingTesting Library**, **Jest**, and **Playwrightfor one of our clients, improving test coverage and ensuring application quality and stability.
- Developed project functionalities and maintenance through the use ofcontinuous integration (CI)andcontinuous deployment (CD)**, ensuring fast and reliable deliveries with tools like **Jenkinsand **GitHub Actions**.
- Worked on the development of mobile applications withReact Nativeand **Expo**.
- Actively participated in agile teams under frameworks likeScrumand **Kanban**, collaborating closely with project managers to deliver features iteratively.
- AluxionReact Frontend DeveloperOctober 2020 - February 2021 (4 months)Madrid, Spain
- Was responsible for the implementation andlayoutof web interfaces usingReactand **Next.js**, ensuring designs were faithful to the provided prototypes.
- Worked on creating reusable components withStyled Components**, optimizing the organization and maintenance of **CSScode.
- UsedFigmato collaborate closely with the design team, translating prototypes into code accurately and ensuring a consistent user experience throughout the project.
- Managed the workflow using theGitversion control system and project management platforms likeJiraand **Trello**, ensuring tasks were completed efficiently and within the established deadlines.
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Education
- Higher Degree in Web Application DevelopmentILERNA FP Online2020Grado Superior Desarrollo de Aplicaciones Web