07/26/2026 updated
100 % available
Senior Frontend Engineer & Technical Leader
Barcelona, Spain
Barcelona +25 km
IngenierÃa de Informática (Computer Science) - Universidad de Alicante, SpainAbout me
Senior Frontend Engineer & Technical Leader | 12+ years software engineering, 7+ years React & TypeScript I architect scalable frontend systems, lead technical teams, and define organizational standards.
JavaScriptCascading Style Sheets (CSS)Next.jsSystems DesignTypeScriptTailwindFront End Software Development
React & TypeScript Development
Expertise in building scalable, production-grade frontend systems using React and TypeScript with 7+ years of specialization, including migration of JavaScript codebases to TypeScript, improving type safety and reducing runtime errors.
Frontend Architecture & Domain-Driven Design
Deep knowledge in architecting frontend systems using Domain-Driven Design (DDD) and SOLID principles, including component-driven development, design system architecture, and scalable system design for enterprise applications.
Technical Leadership & Mentoring
Proven track record of leading frontend teams of 5+ engineers, defining organizational standards through architectural decision-making, and mentoring engineers on best practices, architecture, and career growth.
Next.js & Modern Frontend Stack
Hands-on experience with Next.js, Tailwind CSS, React-Query, Vite, and related modern frontend technologies, including building starter templates adopted across multiple products.
Component Library & Design Systems
Creation and maintenance of shared component libraries using Storybook, ensuring consistency and reusability across multiple teams and projects.
Security & Code Quality Practices
Implementation of automated security practices including Snyk vulnerability scanning, SonarCloud quality gates, OWASP best practices, and code review excellence.
Performance Optimization
Optimization of component performance using memoization, code splitting, and SOLID principles, achieving significant reductions in bundle size and runtime errors.
Testing & Quality Assurance
Proficiency in automated testing using Vitest, Testing-Library, and MSW, ensuring high code quality and reliability across frontend systems.
DevOps & Infrastructure Tools
Experience with GitHub Actions, Docker, Snyk, and SonarCloud for CI/CD pipelines, containerization, and continuous quality monitoring.
Expertise in building scalable, production-grade frontend systems using React and TypeScript with 7+ years of specialization, including migration of JavaScript codebases to TypeScript, improving type safety and reducing runtime errors.
Frontend Architecture & Domain-Driven Design
Deep knowledge in architecting frontend systems using Domain-Driven Design (DDD) and SOLID principles, including component-driven development, design system architecture, and scalable system design for enterprise applications.
Technical Leadership & Mentoring
Proven track record of leading frontend teams of 5+ engineers, defining organizational standards through architectural decision-making, and mentoring engineers on best practices, architecture, and career growth.
Next.js & Modern Frontend Stack
Hands-on experience with Next.js, Tailwind CSS, React-Query, Vite, and related modern frontend technologies, including building starter templates adopted across multiple products.
Component Library & Design Systems
Creation and maintenance of shared component libraries using Storybook, ensuring consistency and reusability across multiple teams and projects.
Security & Code Quality Practices
Implementation of automated security practices including Snyk vulnerability scanning, SonarCloud quality gates, OWASP best practices, and code review excellence.
Performance Optimization
Optimization of component performance using memoization, code splitting, and SOLID principles, achieving significant reductions in bundle size and runtime errors.
Testing & Quality Assurance
Proficiency in automated testing using Vitest, Testing-Library, and MSW, ensuring high code quality and reliability across frontend systems.
DevOps & Infrastructure Tools
Experience with GitHub Actions, Docker, Snyk, and SonarCloud for CI/CD pipelines, containerization, and continuous quality monitoring.
Experience
Professional experience10+ years
Freelancer since2026
Languages
EnglishFluentSpanishNative speaker
Project history
Building scalable, production-grade frontend systems for engine optimization (EOS) serving multiple airlines. Leading a frontend team of 5+ engineers, architecting IAGs entire frontend stack through Knowledge Decision Documents (KDDs), defining Next.js, React, TypeScript, Tailwind, ESLint standards. Built TesseractKit starter template, created shared component library with Storybook, established automated security practices, and reduced incident tickets by 35%. Stack: Next.js, React, TypeScript, Tailwind CSS, ECharts, React-Query, Vitest, MSW, Storybook, GitHub Actions, Docker, Snyk, SonarCloud.
Designed and implemented scalable frontend systems for a mission-critical notification platform serving multiple business units. Reduced incident tickets by 35%, established clean code standards (SOLID, DRY), and developed a comprehensive component library in Storybook. Stack: React, TypeScript, Vite, React-Query, Tailwind CSS, Testing-Library, Shadcn, Storybook.
Migrated 21% of JavaScript codebase to React with TypeScript, improving type safety and reducing runtime errors by 40%. Optimized component performance achieving 30% reduction in bundle size. Facilitated integration of shared components across 5+ teams. Stack: React, TypeScript, React-Query, Testing-Library, Styled-Components.