Hire the Best JavaScript ES6 Developers

Hi, Everyone! I'm ✅ Top-rated professional with over 7 years of commercial experience. ✅ One of the best Three.js developers on Upwork with 100% job success rate! ✅ React frontend developer with a strong knowledge and experience in 3D web applications. Looking to bring your 3D vision to life? Let’s chat and make it happen! What I Can Do for You 1. Develop robust product or data management platforms. 2. Create advanced data annotation tools for 3D assets. 3. Design and implement versatile 3D configurators and editors. 4. Develop custom 3D tools, interactive landing pages with immersive experience. 5. Work with various data formats (e.g., FBX, GLTF, OBJ) and integrate them smoothly into your projects. Implement “View in AR” functionality. 6. Create complex animations and visual effects. 7. Develop mini games. Incorporate physics into your application using engines like cannon-es. 8. Help you to visualize large point cloud datasets on the web 9. Perform various frontend development tasks, including layout and design using REACT, HTML, CSS, and JavaScript. 10. Optimize code for improved performance and scalability. Debug and resolve complex code issues efficiently. Tech stack: Frontend Development: Three.js, React, R3F, Redux, Potree, Chart.js, JavaScript, GLSL, HTML5, CSS3, SASS. Backend Development: Node.js, Express, AWS, puppeteer. Tools and Software: Visual Studio Code, GitHub, GitLab.

"Bridging the gap between powerful backend logic and stunning frontend CMS design." Most developers are limited to either 'drag-and-drop' tools or 'complex coding.' I offer the best of both worlds. Whether you need a highly-customized WordPress/Shopify ecosystem or a robust Full-Stack Web Application built from scratch, I deliver scalable, secure, and high-performance solutions. My Expertise Full Stack Development (Custom Logic) I build custom web applications and dynamic features that standard CMS tools can't handle. From database architecture to API developments, I ensure your tech stack is rock-solid. Tech: React.js, Next.js , Node.js, PHP, JavaScript (ES6+), SQL/NoSQL. Specialties: Custom Dashboards, API Integrations, and Backend Automation. CMS Architecture (Platform Agnostic) I master the entire CMS landscape to choose the right tool for your business growth. No more "one-size-fits-all" solutions. Market Leaders: WordPress (Custom Themes & Bricks/Elementor), Shopify, Webflow. Business & Pro Platforms: Wix, Squarespace, Framer. Enterprise & Headless: Strapi, Contentful, Magento, Joomla. Strategic Technical Solutions Performance Engineering: Optimizing Core Web Vitals and server-side response times for lightning-fast speeds. Seamless Migrations: Safely transferring data and SEO rankings between platforms (e.g., Wix to WordPress, or Shopify to a custom stack). UI/UX to Code: Pixel-perfect conversion of Figma/Adobe XD designs into fully functional websites. Why Clients Choose Me? Working with me means you get a technical partner, not just a task-doer. I focus on clean code, scalable architecture, and transparent communication. My goal is to deliver a product that is powerful enough to handle your traffic, but easy enough for you to manage yourself. Stop compromising on technical limitations. Let’s build a digital asset that truly scales. Click "Message" or "Hire" to start the conversation!

I build WooCommerce stores that convert visitors into buyers. 8+ years building product pages, checkout flows, and mobile UX for e-commerce in Portugal, Spain, Estonia, and the US. I don't install templates and hope they work. I write custom CSS, PHP, and JavaScript to fix the exact problems that kill sales: slow load times, broken mobile checkouts, missing trust signals, and confusing product variants. Recent work: - Estonian tools retailer: full WooCommerce store with dynamic shipping pricing, custom checkout fields, simplified legal checkout, and multilingual breadcrumbs. - Portuguese LED mirror store: optimized variable product pages with sticky add-to-cart, trust badges, and mobile-first layout. - Portuguese custom bathroom mirror store: complex variant handling and responsive product specs. - Spanish electric scooter store: high-consideration product pages with CRO-focused mobile UX. - Biohacking peptide store: dark-themed landing page with WhatsApp order flow, product grid, and offer popups. What I fix: - Product pages that confuse buyers on mobile - Checkouts with too many fields or broken responsive layouts - Slow load times (reduced a site from 6 seconds to under 2) - Missing trust signals: reviews, guarantees, secure badges - Heavy plugins that bloat the site Tools I use daily: - WooCommerce: variable products, subscriptions, payment integrations (Stripe, PayPal, Montonio) - Elementor Pro: custom modules, responsive layouts, dynamic content - CSS / HTML / PHP / JavaScript: tailored solutions when plugins are not enough - ACF: flexible content structures clients can manage without calling me - Yoast SEO: on-page optimization, Schema markup, meta templates - Performance: caching, image compression, code optimization, Core Web Vitals I also have agency experience editing and creating content within Avada-powered sites. I work fixed-price for clear scopes, hourly for ongoing support. Daily communication, clear updates, on-time delivery.

My clients emphasized my ability to quickly dive into projects and deliver results aligned with requirements and acceptance criteria within the required timeframe. Greetings! I am a Senior front-end developer with a proven track record in React.js, Angular, JavaScript, HTML, and CSS. Finished 39+ projects. 5500+ happy hours, full of challenging tasks, crucial moments, and fun. From an idea to the final launch, I've got you covered. Please feel free to write to me before the project. ⭐⭐⭐⭐⭐ "Vitalii is a person to cooperate with for those who care about their time, money, quality of work, deadlines, and want to avoid hustling. I was impressed by his ability to dive into the context of tasks, finding the right approach for a particular task, asking the right questions, and providing updates on a daily basis. Everything went smooth from the very first message to the final result. We were able to rump up the developing process, improve the code base without the need for big rewrites, and all within just a week with Vitalii's help. His architecture skills and experience have helped us to find the right way for developing the last milestone which was quite tricky and complicated." - Daniel Turczański, Entrepreneur, JQL Search Extensions. Upd: 25.07.25 Why you should choose me over other front-end developers: 🏅 Top Rated Plus Front-End Developer - ONLY 3% on Upwork 🎯 All projects have successfully finished with five-star feedback ✅ Certificates from Microsoft and Udemy ⚡ Immediate answers to any contract/invite in less than three hours ⌚ Available for RUSH projects and calls You will get more than just a front-end developer: - Top-notch experience in Front-end development (React, Angular, JavaScript, Typescript, HTML, CSS) - Proven soft and hard skills - Ability to quickly dive into the project and deliver results within a minimum time frame - 24/7 availability for communication and support - Hustle-free environment for your ideas - An individual deeply committed to your success and adding value to your enterprise --- Keywords: Front End Developer, Front End Development, Front End, React, React.js, TypeScript, JavaScript, JS, Redux, Redux Toolkit, React Hook Form, React Query, React Table, React Router, React Bootstrap, Material UI, MUI, Angular, Angular.js, Angular 8, Angular 9, Angular 10, Angular 11, Angular 12, Angular Material, Ng Bootstrap, NgRx, RxJS, Ng cli, Nx cli, Next.js, SSR, SSG, SWR, App Router, Pages Router, Tailwind CSS, Tailwind, Radix UI, Shadecn UI, Styled Components, CSS Modules, HTML, HTML5, CSS, CSS3, Twitter Bootstrap, Bootstrap, Sass, Less, Scss, Webpack, Vite, Vite.js, Vercel, Cloudflare Pages, API, REST, Graphql, Jira, Asana, Shortcut, GitHub, BitBucket, GitLab, Figma, Zeplin, Adobe XD, Landing Page, SaaS, MVP, PoC, Startup, Product, Enterprise.

If you've worked with developers who disappear mid-project or deliver generic templates, you already know the cost of rework and delays. I build custom WordPress websites focused on performance, SEO, and long-term scalability — so you don't deal with that again. I've worked on WordPress projects for companies like KraftHeinz, Grupo Boticário, and Hospital Mater Dei — and more recently with US and European teams at Dexian (Florida), Titan Clarity (Seattle), and Open Circle (Spain). What I focus on: WordPress websites that are fast, SEO-structured, and easy to scale — not just visually done. → Reduced LCP from ~5s to under 2s across multiple WordPress projects — measurable in PageSpeed Insights → Delivered 20+ pages from Figma to production in 5–6 weeks for Open Circle (Spain) → A/B testing and CRO implementation on high-traffic pages at Nuvemshop's Growth team (VWO + HubSpot) → Delivered a complete 8-page WordPress site from scratch in under 10 hours — responsive, production-ready Core tools: WordPress (custom themes, plugins, hooks & actions), Elementor, ACF, Gutenberg, WooCommerce. Also working with: PHP, React, Next.js, TypeScript, SEO, Core Web Vitals, GTM/GA4. How I work: Clear scope, structured delivery, and proactive updates — so you always know what's happening and when. I work seamlessly across US and European time zones, with daily communication in English. If your project needs someone who reads the brief, builds to spec, and delivers without drama — let's talk.

🏅 5+ Years Experience 🏅 Full-Stack Web Development Specialist 🏅 Scalable & High-Performance Applications Expert Hi, I'm Hassan, a Software Engineer with 𝟱+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗵𝗮𝗻𝗱𝘀-𝗼𝗻 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝗱 𝗱𝗲𝗽𝗹𝗼𝘆𝗶𝗻𝗴 𝘀𝗰𝗮𝗹𝗮𝗯𝗹𝗲 𝘄𝗲𝗯 𝗮𝗽𝗽𝗹𝗶𝗰𝗮𝘁𝗶𝗼𝗻𝘀 𝗮𝗻𝗱 𝗘𝗥𝗣 𝘀𝘆𝘀𝘁𝗲𝗺𝘀. 𝗜 𝗳𝗼𝗰𝘂𝘀 𝗼𝗻 𝗰𝗿𝗲𝗮𝘁𝗶𝗻𝗴 𝘀𝗼𝗹𝗶𝗱 𝗯𝗮𝗰𝗸𝗲𝗻𝗱 𝗮𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲𝘀 𝗮𝗻𝗱 𝘀𝗺𝗼𝗼𝘁𝗵, 𝗵𝗶𝗴𝗵-𝗽𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲 𝗳𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲𝘀 𝘂𝘀𝗶𝗻𝗴 𝗺𝗼𝗱𝗲𝗿𝗻 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗳𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀. I care deeply about writing clean, maintainable code and delivering solutions that are practical, scalable and aligned with real business goals. 𝗠𝘆 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻𝗰𝗹𝘂𝗱𝗲: 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: ✅ Expert in Nest.js and Next.js ✅ Strong command of modern JavaScript (ES6+) ✅ End-to-end application development ✅ RESTful APIs & backend architecture design 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁: ✅ Clean, responsive and user-friendly interfaces ✅ Component-based UI development ✅ Performance and UX optimization 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗲𝗲𝗿𝗶𝗻𝗴: ✅ Scalable and secure server-side development ✅ Business logic implementation ✅ Database design and optimization ✅ Performance-focused API development 𝗖𝗼𝗱𝗲 𝗤𝘂𝗮𝗹𝗶𝘁𝘆 & 𝗧𝗲𝘀𝘁𝗶𝗻𝗴: ✅ Clean, maintainable and testable code ✅ End-to-End (E2E) testing implementation ✅ Best practices for performance and reliability 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 𝗪𝗼𝗿𝗸𝗳𝗹𝗼𝘄: ✅ Agile & collaborative development approach ✅ Clear documentation and structured communication ✅ Requirement analysis before project kickoff 𝗣𝗿𝗼𝗷𝗲𝗰𝘁 𝗛𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: ✅ Delivered multiple end-to-end web applications and ERP systems ✅ Built scalable backend architectures for growing platforms ✅ Developed core product features from concept to deployment ✅ Ensured smooth performance with optimized and test-driven code ✅ Strong collaboration with clients and cross-functional teams 𝗦𝗸𝗶𝗹𝗹𝘀 & 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: ✅ JavaScript (ES6+) ✅ Nest.js, Next.js ✅ Full-Stack Web Development ✅ REST APIs ✅ Backend Architecture ✅ E2E Testing ✅ Performance Optimization ✅ Clean Code & Best Practices ✅ Agile Development ✅ Requirement Analysis & Documentation 📈 𝗪𝗵𝘆 𝗖𝗵𝗼𝗼𝘀𝗲 𝗠𝗲? ✅ 5+ years of real-world development experience ✅ Clean, scalable and maintainable code ✅ Strong communication & requirement understanding ✅ Focused on quality, performance and reliability ✅ Business-oriented development mindset 💬 Let’s collaborate to build secure, scalable and high-performing web applications that deliver real value.