Hire the Best Front-End Developers

⭐️⭐️⭐️⭐️⭐️ Top 1% Expert-Vetted Web Developer on Upwork 📍 No short-term projects 📞 Kick-off with the team is mandatory 🧨 Available for a quick project start ★ Top-100 Service Provider by Clutch ★ $500M+ Raised by clients ★ 99+ International Awards ★ 15+ years of expertise (NOKIA, OPERA, OPPO, UDEMY, AUTH0, etc.) 👋 Hi, I'm Sergii! I'm a senior front end web developer, full stack developer Next.js specialist, and front end developer React with 10+ years of experience building SaaS platforms, AI products, eCommerce solutions, and custom web applications. Over the years, I've helped launch 100+ products using React, React NextJS, Next.js, and modern JavaScript frameworks. My work combines technical architecture, front-end engineering, and product thinking to create scalable applications that deliver measurable business results. 🏆 Why Clients Work With Me ✔ 100+ React, React Next, and Next.js projects delivered ✔ 50+ fully launched SaaS, AI, fintech, and eCommerce products ✔ $500M+ raised by companies I've supported ✔ 20+ long-term Upwork clients ✔ 30+ Shopify and Shopify Webflow projects completed ✔ Mobile and web products used by thousands of daily users ✔ 10+ years as a front end developer React specialist building high-performance interfaces 🚀 Core Expertise Front-End Development React As a front end developer React, front end web developer, and front end designer, I've built modern interfaces for startups, enterprise software, and high-growth SaaS companies that succeed. Using React, React NextJS, Next.js, TypeScript, Tailwind, and modern UI frameworks, I develop scalable products focused on performance, accessibility, and maintainability. My front-end architecture has helped companies reduce load times, improve conversions, and accelerate development with reusable component systems. React & Next.js Development I've delivered 100+ React and Next.js applications, including SaaS platforms, dashboards, marketplaces, AI tools, and enterprise software. As a front end developer React and full stack developer Next expert, I build SSR applications, SEO-friendly architectures, scalable APIs, and reusable design systems that support long-term product growth. Mobile App Development I also specialize in mobile app development using React Native, helping companies launch scalable cross-platform applications. As a mobile app developer, I've delivered products for healthcare, fintech, logistics, education, and SaaS companies -- from mobile app design and architecture to deployment and optimization. My experience includes React Native Mobile applications and React Native Full Stack solutions connected to cloud infrastructure and modern APIs. Shopify & Webflow I've completed 30+ Shopify and Shopify Webflow projects, helping brands improve customer experience, storefront performance, and conversion rates. As a Shopify front end developer, I build custom themes, Shopify Hydrogen storefronts, headless commerce solutions, and modern eCommerce experiences. I also work with Webflow teams to bridge design and development through scalable implementations and performance optimization. AI & Python As a front end developer React and Python specialist, I've contributed to AI-powered SaaS products featuring OpenAI integrations, vector search, intelligent chat interfaces, workflow automation, and custom dashboards. My experience combines Python APIs, LLM technologies, automation workflows, and modern SaaS architecture to build AI products that scale. 💻 Technology Stack React • React Next • React NextJS • Next.js • React Native • React Native Mobile • React Native Full Stack TypeScript • JavaScript • Node.js • NestJS • Express • Fastify Shopify • Shopify Webflow • Webflow • WordPress MongoDB • PostgreSQL • MySQL AWS • Google Cloud • Azure Tailwind • Storybook • Redux • GraphQL 📈 Proven Experience During 10+ years as a front end web developer and front end developer react, I've helped startups and enterprise businesses launch products from MVPs to enterprise SaaS platforms. More than 100 React and Next.js applications have been successfully delivered with a focus on scalability, clean architecture, and long-term maintainability. I've completed 30+ Shopify and Shopify Webflow implementations as a Shopify front end developer React, creating custom storefronts, headless commerce experiences, and conversion-focused user journeys. Working closely with product teams as a front end designer, I transform Figma designs into pixel-perfect, production-ready applications. 💎 Why Work With Me Clients hire me because I don't just write code -- I help build products that scale, perform, and generate real business results. Whether you need a front end developer React, Shopify front end developer React, React Native Full Stack engineer, mobile app developer, Webflow expert, or full stack developer Next.js partner, I'd be happy to discuss your project!

Hi there! I'm a highly skilled 𝗨𝗜 𝗨𝗫 𝗗𝗲𝘀𝗶𝗴𝗻𝗲𝗿 𝗮𝗻𝗱 𝗙𝗿𝗼𝗻𝘁 𝗘𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 with 7+ years of experience creating visually appealing and user-friendly websites and web applications. My strong design background coupled with my coding expertise allows me to deliver high-quality projects that not only look great but also function seamlessly. As a 𝗨𝗜 𝗨𝗫 𝗗𝗲𝘀𝗶𝗴𝗻𝗲𝗿, I understand the importance of creating an intuitive and engaging user experience. I conduct thorough research and analysis to gain a deep understanding of your business and your target audience, and I use information to create designs that are not only aesthetically pleasing but also effective in achieving your goals. As a 𝗙𝗿𝗼𝗻𝘁 𝗘𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿, I have extensive knowledge of HTML, CSS, Bootstrap, JavaScript, React, Next js and other related technologies. I am proficient in various front-end frameworks such as React and I always ensure that my code is clean, well-structured, and optimized for performance. 𝗠𝘆 𝘀𝗸𝗶𝗹𝗹𝘀 𝗮𝗻𝗱 𝗲𝘅𝗽𝗲𝗿𝘁𝗶𝘀𝗲 𝗶𝗻𝗰𝗹𝘂𝗱𝗲: Creating wireframes, prototypes, and mockups using design tools such as Figma, Sketch, and Adobe XD. Developing responsive and mobile-first websites and web applications. Integrating designs into various content management systems (CMS) such as Wordpress, Shopify, and Squrespace. Collaborating with back-end developers to ensure seamless integration and functionality. Conducting user testing and implementing feedback to improve the user experience. Staying up-to-date with the latest design and development trends and technologies. I am dedicated to delivering high-quality work that meets and exceeds my client expectations. If you're looking for a UI/UX Designer and Front End Developer who can bring your vision to life, please don't hesitate to get in touch!

Im Currently Upwork's top 10% in web/mobile and Healthcare Systems development.(Via UpworkMrr Rankings). Give me something to build and i'll build it so it works for you 24/7. Thats my promise. If you shoot me a invitation or message ill send you a personalised loom video back on how i may be able to help you! A little more about me: I help growth-focused businesses save time and scale fast by offering both systems and automations as full stack developer, so you have clean stored data, and the benefits of automations If your team is stuck in spreadsheets or bogged down by manual work, I’ll build reliable software systems and AI agents to turn your chaos into streamlined, data-driven processes. • last +2y building sensitive healthcare softwares HIPAA with react, react native, next, fastapi, and azure for infra. • 3+ years taking products from idea to production—owning architecture, development, deployment, and real-world adoption. • Experienced onboarding clients and working directly with stakeholders. • 100% Job Success Score | 5.0★ • HIPAA certified. • Real, measurable ROI my systems pay for themselves. • Clear communication and tailored solutions, every time. If you’re looking for someone who can own the entire technical side of your product from planning and architecture to deployment and long-term support while delivering quickly and maintaining high quality, those are exactly the kinds of projects I look for also. 🔧 EXPERTISE: FastAPI | React | React Native | Next.js | next | Back-End Development | Front-End Development | Full-Stack Development | Mobile App | Web Application | Supabase | PostgreSQL | Healthcare Software | HIPAA | LangChain | Node.js | js | API Integration | Azure DevOps | User Authentication | Electronic Health Record (EHR) | Electronic Medical Record (EMR)

⭐️Most agencies quote 3 months and $40K for an MVP. I do it in 2–6 weeks - here's how. 💡 130+ production-grade products shipped (SaaS, MVPs, AI systems, marketplaces) 💰 $16.5M+ revenue generated for client products 👥 160K+ active users powered by systems I built ⚡ 1M+ API requests/month at 99.9% uptime 🚀 MVP → production in 2–6 weeks, built to scale from day one 🔥 WHAT I DO Building a SaaS, MVP, or AI-powered product? You need a Full Stack Developer who owns React frontend and Node.js backend end-to-end, ships in weeks (not quarters), and writes code your future team won't throw away. That's what I do. Early-stage MVP, productionizing a prototype, scaling a live SaaS platform, or rebuilding a legacy codebase — I've done it on React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, AWS for over 10+ years. 🔥 ROLES I TAKE ON (10+ YEARS EXPERIENCE) ✔ Full Stack Developer / Full Stack Engineer — 40+ end-to-end SaaS platforms (React + Node.js), 10+ years ✔ Frontend Developer / Front-End Developer — 30+ production UI builds, 10+ years ✔ React Developer / React.js / ReactJS Developer — scalable React apps since 2015, 10+ years ✔ Node.js / NodeJS Developer / Backend Developer — 25+ APIs, 1M+ req/month, 10+ years ✔ Vue.js Developer / Nuxt.js Developer — 8+ Vue projects, 8+ years ✔ Next.js Developer / NextJS Developer — 15+ SSR/SSG SaaS platforms, 7+ years ✔ TypeScript Developer / JavaScript Developer — 50+ typed and untyped JS codebases, 10+ years ✔ SaaS Developer / Web App Developer — MVP to scale, 10+ years ✔ Lead Frontend Engineer / Senior Full Stack Engineer — led 18+ projects 🔥 INDUSTRIES I SERVE ⚖️ LegalTech founders — 6+ Case Management Systems, Document Workflows, Client Portals, Compliance SaaS 🏥 Healthcare & MedTech — 8+ Patient Platforms, Telehealth, HIPAA-Compliant data, Clinic Management SaaS 📦 Logistics & supply chain — 5+ Logistics Platforms, real-time tracking (sea/air/truck), Project44, INTTRA, EDI 🛒 Marketplace & e-commerce — 15+ Multi-Vendor Marketplaces, B2B & Two-Sided Marketplace, Stripe, bidding, complex search 🤖 AI startups — 12+ AI-Powered products: OpenAI / Claude API / LLM, RAG Chatbots, AI Agent Platforms, vector DBs, FastAPI, browser extensions 📝 No-code & enterprise SaaS — 10+ Form Builders, Admin Dashboards, Internal Tools, Microservices, Multi-tenant 🌐 Media, AdTech & publishing — 6+ Publisher Platforms, CMS, payment gateways, Analytics Dashboards 🏠 Real estate & PropTech — Property Listings, Bidding & Auction systems, Agent Dashboards 💰 FinTech founders — Stripe Connect, subscription billing, multi-currency, KYC, Fintech MVP 📚 EdTech — course delivery, student dashboards, progress tracking, live sessions 🔥 RESULTS I DELIVER ✔ MVP → production in 2–6 weeks, 35% fewer bugs, 5–8 weeks shorter delivery cycle ✔ Frontend: LCP under 1.5s, Lighthouse 90+, bundle size cut 40%, 18–27% engagement uplift ✔ Backend: 1M+ API requests/month, 99.9% uptime, 40–60% lower latency ✔ Database: 3–5x faster response, 70% less DB load; 90% faster workflows, 65% fewer back-office actions ✔ +30% conversion on React / Next.js apps; 15–22% better marketplace lead quality ✔ 15,000+ shipment operations/month, 2,400+ completed orders, 30,000+ healthcare users ✔ 20+ SaaS MVPs launched, 47% fewer bugs after legacy modernization 🔥 HOW I WORK I think like a product engineer, not a code-monkey. Before writing a line, I align on the business outcome — who the user is, what they pay for, where the product needs to be in 6 months. Then I ship in weekly demos and stay available on Slack / Telegram for fast turnaround. Typical cycle: 1️⃣ Discovery & scoping (2–3 days) — define MVP boundary 2️⃣ Architecture — clean foundations, scalable schema, right stack 3️⃣ Weekly sprints with demos — steady progress every week 4️⃣ Production launch — CI/CD, monitoring, error tracking 5️⃣ Post-launch support — most clients keep me on 🔥 TECH STACK Frontend: React.js, ReactJS, React Hooks, Next.js, NextJS, Vue.js, Nuxt.js, TypeScript, Redux, Zustand, Tailwind CSS, shadcn/ui Backend: Node.js, NodeJS, Express.js, NestJS, Python, FastAPI, REST, GraphQL, WebSockets Database: PostgreSQL, Supabase, MongoDB, MySQL, Redis, Prisma Supabase: Auth, Row-Level Security, Edge Functions, Realtime, Storage AWS: Lambda, S3, RDS, EC2, CloudFront, API Gateway, SQS, SNS, Cognito, ECS Other cloud: Firebase, Vercel, Netlify, Cloudflare AI / ML: OpenAI API, Claude API, LangChain, RAG, RAG Chatbot, AI Agent, Computer Vision Payments: Stripe Subscriptions, Stripe Connect, Stripe Checkout, Stripe Billing, PayPal Integrations: Twilio, SendGrid, Resend, Slack API, Telegram Bot API, EDI, Project44 Mobile: React Native, React Native Expo, iOS / Android 🚀 Building a SaaS, MVP, marketplace, or AI-powered product? Click "Invite" or "Hire" and send the brief.

I build pixel-perfect websites for SaaS startups, agencies, and DTC brands — Figma to live in 2–4 weeks, fully responsive, SEO-ready, and easy to maintain. 60+ projects shipped with a 100% client satisfaction rate over 6 years on Upwork. 🏆 Top Rated on Upwork 🏆 $50K+ earned, 60+ jobs, 1,150+ hours 🏆 100% Client Satisfaction What I do best: ✅ Figma → Webflow conversion, pixel-perfect and responsive ✅ Advanced Webflow CMS setup, dynamic content, and CMS migrations ✅ Client-First (Finsweet) and Relume architecture for clean, scalable builds ✅ Custom interactions, GSAP and Lottie animations ✅ On-page SEO, page speed optimization, Core Web Vitals ✅ API integrations, Memberstack, Zapier, Make automations Also available for: Squarespace, HubSpot CMS, and Framer projects. Why clients keep coming back: - You work directly with me — no account managers, no juniors handed your project. - Clear timelines and weekly progress, no silent weeks. - I don't ship a project until it's pixel-perfect on every breakpoint. Recent client feedback: ⭐⭐⭐⭐⭐ "The most talented frontend developer on Upwork. A true master of his craft." ⭐⭐⭐⭐⭐ "Excellent engineer with the drive to go the extra mile. If you want someone who treats the project as his own — you've found the right person." ⭐⭐⭐⭐⭐ - "Dmitriy is a true professional at what he is doing. I haven't met any front-end developers in the last 10 years who code such pixel-perfect websites." Send a message with a quick description of your project and a link to your design (Figma is great). I usually reply within a few hours and can give you a fixed quote and timeline the same day. -- Dmitrii

🚀🚀🚀 I help businesses build fast, user-friendly, and SEO-optimized websites that convert visitors into clients. I combine clean front end development with flexible WordPress solutions to deliver measurable business results. Tailored Websites That Help Your Business dive, thrive, and scale 🚀🚀🚀 🏆🏆🏆 Top-Rated Plus WordPress Developer, Front End Developer, Front End Web Developer, WordPress Elementor developer. I have 7+ years of experience in Front End Development. I have 6+ years of experience as a WordPress Full Stack Developer. I’ve completed 150+ projects, maintain a 100% Job Success Score, and have logged 3700+ hours on Upwork. As a WordPress Developer and Website Designer aand WordPress UI UX developer, I create custom WordPress website design solutions using WordPress Elementor, Avada, and other modern builders. I also work with Shopify as a Shopify Developer, delivering scalable eCommerce solutions. My background in web design allows me to bridge the gap between design and development for a creating pixel-perfect websites. I react fast to the client's requirements. I specialize in building SEO-optimized, responsive, and high-performing WordPress websites with clean, maintainable, and scalable code. Every project is crafted to ensure excellent UX UI, strong performance, and long-term growth - helping users dive into content and thrive, following conversion-focused principles inspired by Thrive Theme philosophy. I’ve worked as a Front End Web Developer and Full Stack Web Developer (PHP) on large-scale projects, collaborating closely with backend developers, designers, and project managers. My experience also includes working as a React Developer, building interactive and dynamic interfaces using React and modern JavaScript frameworks. As a WordPress back-end developer, I develop custom functionality, plugins, and integrations using PHP, delivering scalable and efficient solutions tailored to each project's needs. Projects I work with: ✔️ Landing pages ✔️ WordPress website development ✔️ WordPress website design and redesign ✔️ Corporate websites ✔️ Front end projects ✔️ eCommerce websites ✔️ B2B and B2C projects Technologies & tools: ✔️ HTML, HTML5, CSS, CSS3, Tailwind CSS, SASS ✔️ JavaScript, Vanilla.js, jQuery, Bootstrap, Canvas ✔️ React, React.js ✔️ PHP, Laravel, API integration ✔️ MySQL, SQL ✔️ WordPress (ACF, Elementor, Bakery Builder, Bricks Builder, Brizy, WooCommerce, BuddyPress, Gutenberg, LearnDash, Divi, Avada) ✔️ SEO optimization ✔️ Shopify ✔️ Parallax, motion animations ✔️ Dashboard development ✔️ Sketch, Figma, Zeplin, PSD, Adobe XD, Adobe InDesign, Adobe Photoshop ✔️ Responsive / Cross-browser / Cross-platform development ✔️ Pixel-perfect implementation ✔️ Git / Bitbucket 🏆 Why my work stands out 7+ years of experience in WordPress and front-end development 150+ completed projects for businesses, startups, and agencies Clean, scalable builds using ACF, Elementor, and custom solutions Focus on performance, SEO structure, and Core Web Vitals Experience with WooCommerce, Stripe integrations, and dynamic content Structured approach that makes websites easy to manage and extend Responsive builds optimized for all devices and screen sizes Strong focus on UX and conversion-driven layouts Projects built with a structured approach typically achieve: • up to 40 - 60% faster load times after optimization • 20 - 40% improvement in user engagement (time on page, interactions) • cleaner UX and structure leading to better conversion flow • scalable architecture that reduces future development time by 30 - 50% I’m a detail-oriented Web Developer with a strong focus on architecture, performance, and scalability. I provide clear daily communication, regular updates, and can commit 40+ hours per week. If you’re looking for a reliable WordPress Developer, Front End Developer, or Full Stack Web Developer who can design and build a website that truly helps your business thrive - let’s discuss your project.