Hire the Best Front-End Developers
in Spain

I am a motivated Junior Front-End Developer based in Barcelona, with strong foundational skills in HTML, CSS, and JavaScript. My experience in customer service sharpens my understanding of client needs and strengthens my communication, ensuring clear and open dialogue throughout each project. I specialize in building clean, simple web pages from scratch, fixing layout and styling issues, and translating designs into polished HTML/CSS code. I'm expanding my JavaScript skills with a focus on dynamic interfaces and interactive experiences, eager to take on new challenges. I am genuinely invested in every assignment, dedicated to delivering quality work while building my portfolio. If you're looking for a detail-oriented developer who values deadlines and transparent communication, I would love to collaborate on your next project.

🚀 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. 👇

👋 Hi, I'm Mario I've been building websites for 15+ years, and what sets me apart is pretty simple: I have a Master's in Marketing, so I don't just build sites that work technically – I build sites that work for your business. Code and strategy together, not one or the other. ✅ What I Do Best: I specialize in WordPress (custom themes, Gutenberg, plugins) and Webflow (Client-First, complex CMS builds), but I'm equally comfortable with Next.js, headless setups with Directus, or migrating legacy sites to modern platforms without losing SEO. I've built everything from 20,000+ page database systems with custom search functionality to multilingual e-commerce sites for international clients across Switzerland, Mexico, USA, and Australia. Performance is non-negotiable for me. I consistently hit 100/100 Core Web Vitals scores, achieve #1 Google rankings through technical SEO, and optimize sites that actually convert – like the one generating 60 leads/day and €1-2K in daily revenue. ✅ My Background: Master's in Marketing from Portugal. My dissertation was on consumer behavior and purchase decisions, which directly shapes how I think about website structure, content hierarchy, and conversion optimization. I'm not just executing designs – I'm thinking about whether this actually serves your business goals. I've worked with clients like Xtensio (LA-based SaaS) for 3 years, growing their organic traffic to 2,500+ daily clicks. I've led major migrations (2,000+ URLs from Drupal to WordPress preserving all SEO), built custom platforms, and helped businesses scale their digital presence strategically. ✅ How I Work: I don't just take orders. I ask questions. Does this content hierarchy make sense? Will this convert or just look pretty? Is there a better way to structure this? That proactive, strategic thinking is why clients stick with me for years, not just one-off projects. Clear communication, no hand-holding needed, and I work remotely with clients across time zones (US, Canada, Europe, Australia). You'll always know where things stand. ✅ Tech I Work With: WordPress (Gutenberg, Elementor, Kadence, custom development), Webflow (Client-First), Next.js, React, Directus, Shopify, Squarespace. SEO tools like Rank Math Pro, Ahrefs, Semrush. Automation with Zapier and Make. API integrations, payment gateways, CRMs, analytics. Figma for design when needed. ✅ Looking For: Long-term partnerships with clients who value strategic thinking, not just technical execution. Custom WordPress builds, Webflow projects, platform migrations, performance optimization, technical SEO – if it involves building something that drives real business results, I'm interested.

WordPress Developer & Elementor Expert | Healthcare, Real Estate & Industrial | 10+ Years · 170+ Projects · 100% Job Success I build WordPress websites that turn regulated, high-stakes industries into clear, trustworthy online experiences. Over 10+ years I've delivered 170+ projects with a 100% Job Success score — websites that load fast, look premium, and convert visitors into enquiries. I work mainly with healthcare, real estate, and industrial / manufacturing clients — sectors where trust, structure, and conversion matter more than flashy design. Custom WordPress and Elementor Pro builds, pixel-perfect Figma-to-WordPress, custom HTML/CSS, and on-page SEO with 90+ PageSpeed scores. ——————————————————————————— ✅ WHAT I DO ✓ Custom WordPress & Elementor Pro development (HTML/CSS, PHP) ✓ Website design & redesign — landing pages, multi-page sites, full rebuilds ✓ Pixel-perfect Figma-to-WordPress & PSD-to-WordPress builds ✓ Mobile-responsive design across all devices ✓ On-page SEO setup (Yoast, RankMath), Core Web Vitals, 90+ PageSpeed ✓ WordPress theme customization, plugin & API integrations ✓ WooCommerce stores and product catalogs ✓ Long-term website maintenance and support ——————————————————————————— 🌍 INDUSTRY SPECIALIZATIONS 🏥 HEALTHCARE & MEDICAL ✓ Mental health & addiction treatment providers ✓ Multi-location clinics & medical practices ✓ Veterinary & animal-health companies ✓ Patient intake forms, insurance verification, location architecture 🏠 REAL ESTATE & PROPERTY ✓ Property developers (pre-launch & sales sites) ✓ Real estate agencies & buyer's agents ✓ Investment firms & syndicators ✓ Construction companies & MEP contractors 🏭 INDUSTRIAL & MANUFACTURING ✓ Building materials & insulation manufacturers ✓ Distributors with technical product libraries ✓ B2B sites for international expansion ✓ Architect- and spec-focused resource sections ——————————————————————————— 🔥 RECENT FLAGSHIP PROJECTS 🏥 NATIONAL MENTAL HEALTH NETWORK (USA) — Enterprise website as lead developer for a behavioral-health provider with 30+ treatment centers across 9 states. Multi-location architecture and insurance verification. [Under NDA] 🏠 TRIUMPH TOWERS — Pre-launch sales website for a 316-unit luxury development in Benidorm, Spain. Elementor sales funnel with full web design and community building. 🏭 POWERWOOL INSULATION — North American mineral wool manufacturer (USA/Canada). B2B Elementor website with full web design, a technical library for architects, and a products catalog. 🐾 VETS CONCEPT — B2B website for an animal-health pharma distributor serving veterinary clinics across the GCC (UAE branch of a French parent company). ——————————————————————————— 💡 WHY HIRE ME ✓ 10+ years as a WordPress Developer & Elementor expert ✓ Custom builds — no cookie-cutter templates ✓ Design that converts, aligned with your brand ✓ Custom HTML/CSS for pixel-perfect Elementor implementation ✓ Mobile-first design with 90+ PageSpeed scores ✓ Figma-to-WordPress, pixel-perfect ✓ Long-term maintenance & content updates ✓ Clear communication, fixed timelines, no surprises ——————————————————————————— 🏆 WHAT CLIENTS SAY "Yana built our website designed by another agency and did an excellent job — very good at communicating and staying on the timeline." — Manufacturing Client "A great developer and Elementor specialist with a commitment to quality. Creative solutions and delivers." — Real Estate Client "Very skilled WordPress and web design professional. Will work with her again for all my website needs." — Repeat Client ——————————————————————————— 📌 ALSO EXPERIENCED IN Wellness practitioners, coaches, authors, personal brands, and e-commerce (WooCommerce). Open to strong-fit projects beyond my main niches. 🎯 NEXT STEP Send me your project brief. I respond within hours and offer a free 20-minute discovery call. — Yana WordPress Developer & Elementor Expert | Healthcare · Real Estate · Industrial | Based in Spain (EU), working globally 🔍 Skills: WordPress, WordPress Developer, WordPress Expert, WordPress Website, WordPress Website Design, WordPress Customization, WordPress Theme, WordPress Landing Page, Elementor, Elementor Pro, Elementor Designer, Elementor Expert, Web Design, Web Designer, Web Development, Web Developer, Custom Web Design, Responsive Web Design, HTML5, CSS3, JavaScript, PHP, WooCommerce, Figma to WordPress, Figma to Website, PSD to WordPress, On-Page SEO, Yoast SEO, RankMath, Core Web Vitals, Landing Page Design, Healthcare Website, Medical Website, Real Estate Website, Manufacturing Website, Industrial Website, B2B Website, WPML, Polylang, Website Consultant

Do you need a modern, responsive, and easy-to-manage website? I’m a Frontend Developer specializing in React, Next.js, and TailwindCSS, focused on building clean, fast, and user-friendly interfaces. With experience across JavaScript, TypeScript, Node.js, Express, Sequelize, MySQL, PostgreSQL, and Firebase, I handle projects from concept to deployment, ensuring smooth communication and reliable results. 🔹 What I Offer • Frontend development with React, Next.js, and Tailwind CSS • Integration with Firebase for authentication and real-time data • Backend setup using Node.js, Express, and PostgreSQL • Figma to responsive UI conversion • Code refactoring, bug fixing, and project maintenance 🌟 Why Work With Me • I take full ownership of every project – from architecture to deployment • Clear, consistent communication at every stage • Focus on usability, scalability, and long-term maintainability • Always committed to delivering real value, not just finished code Let’s collaborate to bring your ideas to life – whether you need a custom web app, a portfolio site, or help improving your current project. 💬 Send me a message, and let’s start! 🔑 Tech Stack: React, Next.js, JavaScript, TypeScript, Tailwind CSS, Node.js, Express, PostgreSQL, Firebase, HTML, CSS, WordPress, Figma, Responsive Design, Vercel, Render, neon.tech, SanityCMS, Git, GitHub

Need someone who can build, stabilize and scale your Android product? You just found him 🤝 📊 12+ years in mobile delivery 📊 20+ Android-focused projects 📊 10+ years supporting regulated and business-critical products 📊 Experience with compliance-ready apps, secure payments, backend-heavy systems and Software Development I help companies create secure, maintainable, high-performance apps for Healthcare, FinTech and consumer products. Core Expertise 🔹 Native Android engineering with modern architecture and Software Design 🔹 Kotlin-first development with maintainability in mind 🔹 Legacy modernization from Java to Kotlin 🔹 Secure integrations, performance tuning, release stability 🔹 Product delivery for Healthcare, FinTech, consumer platforms and Mobile App Development I’m an android developer focused on products where reliability and clean architecture matter. As a kotlin developer, I build scalable solutions with android kotlin best practices, Jetpack tooling and AOSP awareness. Clients come to me for android developer kotlin expertise when they need stability, lower technical debt and growth. I work as an android app developer on products that need more than interface implementation. I support teams with android app development for secure solutions where every android app stays maintainable after launch. My background: improving an android application used by thousands of users, integrating backend systems, payment flows, and healthcare-grade data handling. That is why companies hire me as an android mobile developer ( android mobile app developer ) when they need delivery. What I Do Best ✅ Android development using Kotlin and Java ✅ Architecture design with MVVM, Clean Architecture, modularization ✅ Backend communication, authentication and payment integrations ✅ Performance optimization, debugging, maintenance and release support ✅ Application Improvement for live mobile products ✅ Solo delivery or collaboration inside a larger team My strongest specialization is android developer kotlin work. I often join teams that need android developer kotlin java skills to modernize legacy code, migrate modules, and improve release quality without a full rewrite. That work benefits from practical experience as a java developer and from thinking like an android kotlin developer who can handle new features and stabilization. Relevant Experience Highlights 🔸 Healthcare mobile applications with compliance-aware architecture 🔸 Performance optimization and crash-rate reduction 🔸 Secure data handling and app stability improvements 🔸 Secure apps with payment integration and transaction-safe flows 🔸 Backend integrations with PHP, Python, JavaScript, and REST APIs 🔸 Collaboration with iOS, backend, QA, and web teams 🔸 Ability to scale from one engineer to a delivery team I also have experience with android ble and android bluetooth features for pairing flows and reliable data exchange. Whether I contribute to an android mobile app or support an existing codebase as a mobile developer, I focus on release readiness. Tech Stack 🔸 Android kotlin with Jetpack, Compose, Android SDK, AOSP 🔸 Java, Firebase, secure cloud services, CI/CD 🔸 REST APIs, secure auth, payment gateways 🔸 Node.js, JavaScript, C#, SQL for backend alignment 🔸 Git, Android Studio, release workflows, crash analysis 🔸 MVVM, Clean Architecture, modular apps, scalability-first mindset My work is rooted in native Android, but I also understand broader product ecosystems. I collaborate effectively as an ios developer ( ios app developer ) when cross-platform alignment matters, including iOS Development discussions with teams using Swift. I have worked alongside teams using react native and reviewed delivery implications where flutter developer was involved, though I do not present those as my core specialization. That exposure helps me operate as an android developer and product-minded mobile app developer within cross-functional teams. Team & Product Collaboration 🔹 Coordination with a rest api developer 🔹 Alignment with web application development 🔹 Communication with a web developer or front end developer 🔹 Familiarity with database builder, django, and python automation Support I Can Provide ✔️ Build a mobile app from scratch ✔️ Join an existing product as an app developer android ✔️ Refactor legacy code and modernize architecture ✔️ fix android application bugs and improve release readiness I do not position myself as a wordpress, magento, game developer or unreal engine specialist and I do not use unrelated positioning such as android developer india. Even when someone types android develoer, they usually need a senior specialist who can take ownership. I built mobile applications for autism-related projects with intuitive user experience. 📬 If you need an android developer who can improve an existing product, build a reliable solution from scratch or support growth with kotlin developer depth, send me a message.