Hire the Best JavaScript Developers
in Spain

Frontend developer with 8+ years of experience, specializing in Vue.js and modern JavaScript/TypeScript ecosystems. Freelancing since 2018, building web applications for clients worldwide. Proven track record of inheriting complex legacy codebases and delivering clean, maintainable Vue 3 migrations. Currently integrating AI tooling (Cursor, Claude Code) into development workflows to accelerate delivery while maintaining code quality. Working knowledge of backend technologies (Node.js, NestJS, PHP/Laravel) when full-stack support is needed. Skills Vue 3, Vue 2, Composition API, Options API, TypeScript, JavaScript, Vuetify, Pinia, Vuex, Vue Router, TanStack Query, VueUse, Vite, Webpack, npm, Git, Vitest, Unit Testing, Component Testing, UI & Data Visualization Vuetify, Material Design, Chart.js, Responsive Design, CSS, SCSS/Sass, Ionic (Mobile Development), Auth0, OAuth, REST APIs, Axios, WebSockets, Stripe, Node.js, Express, NestJS, PHP, Laravel, MongoDB, MySQL, Cursor, Claude Code, AI assisted development, AI workflows. Speak spanish and english. Flexible schedule.

Senior Vue.js and JavaScript developer with 10+ years of experience building, refactoring, and scaling frontend applications using Vue, Nuxt, React, Angular, and TypeScript. I specialize in frontend architecture, design systems, and legacy codebase refactoring for startups and product-driven teams. A large part of my work involves taking ownership of existing codebases, improving structure and performance, and helping teams move faster without accumulating technical debt. I’ve worked with distributed teams across the US and Europe on SaaS, fintech, and data-driven products — contributing to component libraries, migrating large Vue applications to Nuxt, stabilizing Angular and React systems, and mentoring developers on best practices. What clients typically hire me for: - Refactoring and modernizing legacy frontend codebases - Designing and maintaining scalable design systems and component libraries - Frontend architecture decisions in startups and enterprise - Vue 3 / Nuxt / React / Angular development with TypeScript - Long-term product engineering and technical ownership Core Technology Stack Frontend: JavaScript, TypeScript, Vue 2/3, Nuxt.js, React, Angular, Pinia / Vuex
 Backend: Node.js, REST APIs, Stream API’s , WebSockets
Styling: HTML5, CSS3, SASS, Tailwind CSS, Bootstrap, Shadcn , Lottie-js 
 Product & Analytics: Mixpanel, 
AI Tooling: Cursor, Claude code, AI Agents, Copilot, N8N
 Workflow: Git (GitHub, GitLab, Bitbucket), Jira, Trello, Notion, Agile/Scrum Why clients work with me: - I take ownership of existing systems and improve them, not just add features - I’ve been refactoring and stabilizing legacy frontend codebases since 2015 - I communicate clearly with founders, designers, and engineers - I focus on maintainability, performance, and long-term scalability I’m flexible with time zones, comfortable working with distributed teams, and happy to take responsibility beyond my immediate scope — especially in startup environments where impact and adaptability matter.


🚀 Specializes in React, Next.js, and Node.js with a strong focus on production-ready SaaS, multi-tenant B2B platforms, and AI-powered web applications. ⭐ Top Rated Plus React developer 📅 6+ years of experience Full-stack development 📦 70+ projects delivered ⏱️ 5,000+ Upwork hours 🔁 ~70% returning clients A full stack developer and React developer with 6+ years of experience building fast, scalable, and secure web applications from MVP to production scale — a proven track record of reliable, high-quality delivery for startups, founders, agencies, SaaS companies, and growing businesses. 🏢 Multi-tenant SaaS & B2B platforms Strong background in multi-tenant SaaS and B2B platforms: secure, role-based systems with custom workflow logic, OWASP-compliant authentication, RBAC, and full Stripe billing (Checkout, Subscriptions, and Connect) — built to scale reliably, reduce manual operations work, and keep subscription billing accurate. This aligns well with SaaS, dashboard, admin panel, and B2B platform projects. 🤖 AI-powered products Experienced in AI-powered products: RAG pipelines, embeddings, semantic search, and prompt engineering with the OpenAI and Anthropic APIs. I build AI SaaS, chatbots, and automation tools with real-time features, streaming responses, and offline-ready PWAs — designed to lower response latency and improve reliability for end users. A strong fit for AI SaaS, automation, and integration projects. 🛒 Web apps, marketplaces & e-commerce As a web developer, I build two-sided marketplaces, e-commerce platforms, booking and scheduling systems, real-time chat and messaging, analytics dashboards, internal tools, and landing pages. Comfortable with complex features like authentication flows, payment processing, real-time data handling, and third-party API integrations. ⚡ Next.js, performance & SEO As a Next.js developer, I work deeply with the App Router, Server Components, SSR, SSG, ISR, and Jamstack builds, plus API routes and middleware — builds that typically improve SEO, reduce time-to-interactive, and deliver faster load times. With strong front end developer experience, I optimize for Core Web Vitals, accessibility, and responsive, cross-browser interfaces — so your product ranks well and feels fast on every device. 🔌 Integrations & features I implement OAuth and SSO, webhooks, payment gateways (Stripe and PayPal), Google APIs, calendar, email and SMS (SendGrid, Resend, Twilio), file uploads, PDF generation and exports, charts and data visualization, advanced search and filtering, notifications, and workflow automation with Zapier and Make. 🛠️ Tech stack A JavaScript developer proficient in React, React.js, Next.js, Node.js, TypeScript, and JavaScript. Skilled in Express, NestJS, REST and GraphQL APIs, tRPC, Prisma and Drizzle, PostgreSQL, Supabase, Firebase, PlanetScale, and Neon. Frontend with HTML5, CSS3, SCSS, Tailwind CSS, Styled-Components, Shadcn/ui, Framer Motion, and GSAP; state and data with Redux, Zustand, React Hook Form, Zod, and TanStack Query. Cloud and DevOps on AWS (Lambda, S3, EC2, RDS, Cognito), Google Cloud Platform, Azure, Vercel, and Netlify, with CI/CD via GitHub Actions. Testing with Jest, Vitest, and Playwright; monitoring with Sentry; headless CMS with Sanity, Storyblok, Payload, and Contentful. As a React Native developer, I also build cross-platform mobile apps with React Native and Expo. 🔧 Beyond my core stack Having worked across many different codebases, I'm also comfortable with and have worked with Python, PHP, Laravel, MySQL, MongoDB, Redis, WordPress, Java, FastAPI, jQuery, Gatsby.js, Remotion, and Web3 — so if your existing project mixes stacks, I can pick things up quickly, take over inherited code, and keep everything moving. 🎯 What clients hire me for Clients hire me for scalable web applications, secure REST and GraphQL APIs, high-performance Next.js front-ends, clean and modern UI, responsive and intuitive dashboards, and reliable, production-ready SaaS — all built with maintainable, well-architected, and tested code. I work across industries including SaaS, B2B, fintech, e-commerce, healthtech, ed-tech, real estate, and online marketplaces, building everything from MVPs and internal tools to full-scale, multi-tenant products. 🤝 How I work You get a reliable senior software developer who reads the brief carefully, asks the right questions, and communicates clearly. I recommend a pragmatic, scalable approach and ship clean, well-tested, production-ready code with strong ownership of performance, security, and maintainability. 💡 Whether you need a new product built from scratch, an MVP developer for a fast launch, a rescue of an existing codebase, or a long-term development partner, I'm here to help. Open to both fixed-scope MVPs and long-term product work. Let's discuss your project — happy to walk through relevant work and a recommended approach on a quick call. 👇

$1M+ earned on Upwork, placing me among a very small percentage of freelancers on the platform. 👋 I'm a veteran full stack developer, full stack javascript developer, React Developer, Node Developer, and web developer with 25+ years of experience building scalable, high-performance web applications, SaaS platforms, automation systems, and enterprise-grade JavaScript solutions using Node.js, React, React.js, Vue.js, Angular, NestJS, Next.js, and TypeScript. As a senior react developer, react.js developer, node developer, node.js developer, backend developer, and javascript developer, I specialize in architecting modern frontend and backend ecosystems - from blazing-fast UI systems and real-time dashboards to scalable APIs, browser automation, cloud-native infrastructure, and AI-powered workflows. Over the years, I’ve successfully delivered 700+ projects across SaaS, eCommerce, Fintech, Web-to-Print, EdTech, Healthcare, CRM, AI automation, marketplaces, enterprise platforms, analytics systems, and business automation products. Whether you need a react.js developer for a complex SPA, a node.js developer for scalable APIs, a full stack developer for an end-to-end SaaS platform, a react native integration expert, or a web developer to modernize legacy systems - I build production-ready solutions designed for scalability, maintainability, and performance. 🏆 Why Clients Work With Me ✔️ 25+ years as a full stack developer, javascript developer & web developer ✔️ 700+ full stack JavaScript, React, Node.js & web development projects delivered ✔️ Expert react developer, react.js developer, node developer & backend developer ✔️ Built scalable systems handling 10M+ API requests/month ✔️ 30+ high-performance apps scoring 90–100 on Lighthouse audits ✔️ Extensive experience with SaaS, CRM systems, AI integrations & automation ✔️ Advanced serverless architecture using AWS Lambda, EventBridge & WebSockets ✔️ CI/CD pipelines and monorepo architectures accelerating delivery by 2x ✔️ Production experience across startups, enterprise platforms & scaling products ⚡ Front-End / React Expertise • React 18, React.js, Vue.js, Angular, Next.js 14+, TypeScript • SSR, ISR, SPA & PWA development • TailwindCSS, Material UI, SCSS, Bootstrap responsive UI systems • Mobile-first interfaces & scalable UI architectures • React micro frontends using Nx, Turborepo & Module Federation • Storybook, reusable component libraries & design systems • Real-time dashboards, analytics systems & live data visualizations • react native integration experience for cross-platform ecosystems 🔌 Backend / Node.js Expertise • Node.js 20+, NestJS, Express, Koa, Hapi • REST API & GraphQL development • JWT/OAuth authentication, RBAC & secure API systems • Redis, Kafka, WebSockets & Socket IO real-time infrastructure • Queue systems with BullMQ, SQS & distributed workers • Microservices & event-driven backend architecture • AWS Lambda, Step Functions & serverless infrastructure • OpenAI API, Dialogflow & AI automation workflows • Scalable backend systems for SaaS, marketplaces & analytics platforms 📦 DevOps & Cloud Infrastructure • Docker, AWS, CloudFront, S3, Vercel, Firebase • GitHub Actions, GitLab CI/CD & Bitbucket Pipelines • Nx monorepos, Turborepo & scalable deployment workflows • AWS CDK & infrastructure-as-code systems • Sentry, DataDog & ELK Stack monitoring • Performance optimization, Redis caching & cloud cost reduction 📊 Database & Performance Engineering • PostgreSQL, MongoDB, MySQL, DynamoDB, Firebase, Redis • Prisma, Sequelize, TypeORM, Mongoose • Backend optimization improving performance by up to 50% • ETL systems, analytics pipelines & event aggregation platforms • Query optimization & scalable database architectures 🌍 Industries & Product Experience • SaaS Platforms & Startup MVPs • AI-Powered Products & Automation Systems • eCommerce & Marketplace Platforms • Fintech & CRM Systems • Healthcare & Real Estate Platforms • EdTech & LMS Development • Marketing Automation & Analytics Dashboards • Enterprise Web Applications & Business Tools ⚙️ Core Stack & Technologies • JavaScript, TypeScript, HTML5, CSS3 • React, React.js, Vue.js, Angular, Next.js • Node.js, NestJS, Express, Serverless Framework • PostgreSQL, MongoDB, MySQL, Redis • AWS, Docker, Firebase, Vercel • Puppeteer, Playwright & browser automation systems • Stripe, OpenAI API, SendGrid, Pandadoc integrations ✅ Let’s Build Your Full Stack JavaScript Platform If you’re looking for a senior full stack developer, react developer, node.js developer, backend developer, javascript developer, or web developer who understands scalable engineering and product strategy - let’s talk. 📩 Message me to discuss your SaaS platform, AI system, automation workflow, web application, marketplace, CRM, or next-gen product. ----------------

I’m a full-stack developer with a focus on Python, Django, and web technologies (Vue.js), bringing expertise in both front-end and back-end development. I’ve had the opportunity to work with a wide range of clients, helping them achieve their goals with high-quality, efficient solutions. I pride myself on being proactive in solving problems and maintaining excellent communication throughout every project. My clients appreciate my ability to understand their needs, provide insightful suggestions, and offer innovative approaches that improve the final product. I’ve worked on various projects, including DeFi applications, complex data visualization systems, and custom web solutions. I’m always open to learning new technologies to meet the evolving requirements of a project, and I adapt quickly to changes. Whether I’m working individually or in a small team, I ensure that projects stay on track with a focus on quality and detail. I strive to make the development process as smooth as possible for my clients and value building strong, long-lasting professional relationships. If you’re looking for a reliable, skilled developer who can not only meet your expectations but exceed them, I’d be happy to discuss how I can help with your next project. Main experiences: Create, maintain, and extend web applications based on Python\Django. Front-end development using Vue.js, Nuxt.js, Figma\PSD. Web3 Python, Django - DeFi: Solidity, Web3, Smart Contracts - Databases: PostgreSQL - Unit testing: pytest, Plawright - Server: Heroku, Digitalocean apps, Ubuntu, Nginx, gunicorn - Libraries: Django REST API - Payment integration: Paypal, Stripe, Coinbase - Docker, Git, OOP, TDD, DRY, GitHub Actions Vue.js, Nuxt.js (2 and 3). Also React but not my main choice. - Front-end: Vuetify, SASS, Pug, Material Design, Bootstrap Other: HTML, CSS, Flask, cryptocurrency, Binance, Celery, Metamask

Greetings from Barcelona! 👋 Real client results are shown below and throughout my Portfolio (I can verify every metric). 📈SEO Growth - 223,000+ Google impressions - 37,700+ organic Google clicks - 100+ commercial keywords ranked in Top 3 - 250+ keywords ranked in Top 10 - Multiple #1 Google rankings 💰Business Growth - 5.8% max CTR - 250% increase in contact clicks - 50% growth in unique visitors - 48% growth in website sessions - Hundreds of leads & inquiries 🛠️ Technical Performance by Google PageSpeed Insights - 93 Performance - 95 Accessibility - 100 Best Practices - 92 SEO I'm a Wix Expert who combines Wix Website Design, Wix Development & Wix SEO Over the past 8+ years, I’ve delivered 30+ Wix Website projects across healthcare, hospitality, sports, education, nonprofit organizations, banking, real estate, & FMCG. Every Wix Website begins with research instead of design. As a Wix Expert, I use Wix Studio to build every Wix Website around measurable business goals, not visual trends. Every Wix Website Design project starts with competitor analysis, semantic clustering, information architecture, UI UX, & conversion planning. Before creating a single page inside Wix Studio, I define how the Wix Website should rank, convert, & scale. That’s why my Wix Website Design process is tightly connected with Wix SEO, content strategy, & long-term business growth. A successful Wix Website Redesign is rarely about changing colors. A Wix Website Redesign should improve rankings, navigation, loading speed, user journeys, & lead generation. As a Wix Expert, I regularly rebuild existing Wix Website projects that look modern but fail to generate qualified traffic because the structure was planned incorrectly. My workflow combines Wix Studio, Wix Website Design, Wix SEO, Website Design, Website Developer experience, UI UX Designer collaboration, Velo development, & technical optimization into one system. Whether the website starts on WordPress, Squarespace, or Shopify, I evaluate the existing architecture before recommending a complete Wix Website Redesign or a targeted fix. I awork closely with Social Media Manager teams, marketing specialists, & content creators. Every Wix Website is planned to support growth, paid campaigns, future Website Design improvements, & scalable content management. My projects include migrations from WordPress, Squarespace, & Shopify, advanced Velo functionality, API integrations, & performance improvements delivered through Wix Studio. Unlike a traditional Website Developer, I don’t separate Wix Website Design from Wix SEO. Every Wix Website is built as a long-term business asset. Every Wix Website Design decision supports SEO. Every Wix Website Redesign is measured against real business metrics. That’s why clients hire me as a Wix Expert instead of simply hiring another designer. What clients usually hire me for As a Wix Expert, I help businesses that need more than a beautiful Wix Website. My work combines Wix Website Design, Wix Website Redesign, Wix SEO, & Wix Studio into one structured process focused on measurable business growth. Typical projects include: - Wix Website Redesign after poor UX or low search visibility - Wix Website Design for startups, healthcare, sports, education, & nonprofit organizations - Wix SEO with measurable results - Advanced Wix Studio development with Velo, CMS collections, & custom functionality - Migration from WordPress, Squarespace, or Shopify to Wix Studio - Technical fix of existing Wix Website projects with indexing, performance, or structural issues - Website Design improvements based on competitor analysis & real user behavior - Collaboration with a UI UX Designer to improve navigation, accessibility, & conversions - Landing page optimization, Website Content Writer guidance, & scalable content architecture - API integrations, Velo development, & custom business workflows - Performance optimization, Wix SEO, & Core Web Vitals improvements - Support for marketing teams, Social Media Manager collaboration, Facebook Ads, & Digital Marketing campaigns Every Wix Website is built using modern Wix Studio architecture with scalable CMS collections, responsive Website Design, & long-term maintainability. Depending on project requirements, I work with: - Wix Studio - Wix Website Design - Wix Website Redesign - Wix SEO - Wix Expert consulting - Wix Website Designer best practices - Website Developer workflows - UI UX optimization - UI UX Designer collaboration - Website Design - Velo - Wix Studio - Wix Website Redesign - WordPress - Squarespace - Shopify - Editor X - Website Editor X - Figma to Website - Figma to Shopify - Wix API - Web Design Mockup Wireframing - SEO Writer - Shopify SEO - Squarespace SEO - Canva - Canva Graphic Designer - Graphic Designer - Photoshop Editing - Landing Page Designer - Web Designer - Website Customization - Wix - GoDaddy - React - NFT