Hire the Best JavaScript 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.

Senior Front-End Developer | Expert in Angular & React Native & Vue | TypeScript | SCSS | Node.js 🔹 8 Years of Professional Experience 🥇Top Rated (100% Job Success Rate) I’m an experienced Front-End Developer with a strong foundation in modern web technologies and over 7 years of experience in building scalable, high-performance web applications. My focus is on delivering visually appealing and user-friendly solutions that exceed client expectations. 📌 𝐌𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: ✔️ 7+ years of professional experience in web and mobile app development. ✔️ 5+ years of uninterrupted experience with Angular 2+ and related technologies (TypeScript, RxJS, NgRx and different UI libraries). ✔️ 2+ years of development experience with React/Redux/React Native, Nuxt.js, Vue.js and Wordpress ✔️ good knowlege of AJAX, JSON, REST API, GRAPH QL, OOP, SOLID, DRY, KISS, YAGNI ✔️ good understanding Docker, CI-CD integration ✔️ good knowlege Node.js, Express, Mongo DB, PostgreSQL 📌 𝐇𝐨𝐰 𝐈 𝐂𝐚𝐧 𝐇𝐞𝐥𝐩 𝐘𝐨𝐮: ✅ Implementing sleek, pixel-perfect interfaces based on detailed UX/UI designs ✅ Collaborating with designers and developers to bring your vision to life ✅ Ensuring scalable, optimized, and maintainable code for long-term success ✅ Creating reusable components and optimizing applications for maximum performance Strong communication skills, work well both independently and within the team. Quickly learns and masters new concepts and skills. 📌 𝐌𝐲 𝐒𝐤𝐢𝐥𝐥𝐬: Angular, AngularJS, Angular CLI, Single Page Applications (SPA), Reactive Forms, Template-Driven Forms, RxJS, NgRx, State Management, Component-Based Architecture, Dependency Injection, TypeScript, JavaScript, Progressive Web Applications (PWA), Lazy Loading, HTML5, CSS3, SCSS, SASS, Bootstrap, Material Design, Angular Material, TailwindCSS, React Native, Vue.js, Vuetify, Pinia, PrimeNG, Kendo UI, Webpack, Babel, ESLint, RESTful APIs, GraphQL, API Integration, CRUD Operations, RxJS Operators, Jasmine, Karma, Protractor, Responsive Design, Cross-Browser Compatibility, Accessibility (WCAG), Figma, Git, GitHub, GitLab, Bitbucket, CI/CD, Docker, Firebase, Websockets, Socket.IO, Data Visualization, Chart.js, Highcharts, Agile Development, Scrum, Jira, Trello, Slack, Website Optimization, Performance Tuning, Lighthouse Audits, Browser Developer Tools, SEO Best Practices, Localization, Internationalization (i18n), Security Practices (OWASP), Design Systems, Component Libraries, Frontend Architecture, Code Refactoring, Debugging, Documentation, UI/UX Collaboration, SaaS Platforms, Ecommerce Platforms, Real-Time Applications.

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.

I am a FULL STACK ENGINEER with strong experience in building scalable, cloud-based applications using ReactJs, NextJs, JavaScript, Python, Ruby, AWS, NodeJS, NestJS, MongoDB, Stripe, Twilio, OpenAI, iElevenLabs and more. Over the past few years, I have led the development of froentend & backend systems for web and mobile apps, including a social media platform MVP where I designed and implemented serverless architecture using AWS Lambda, API Gateway, S3, and DynamoDB. This allowed the platform to scale smoothly and stay cost-effective. My core strength lies in designing RESTful APIs, setting up database structures, and writing clean, efficient code that performs well even under high traffic. I regularly work with MongoDB and have a solid understanding of database design, indexing, and query optimization. I also have hands-on experience in authentication systems, role-based access control, and integrating third-party APIs. I enjoy solving complex problems and making backend systems faster, more secure, and easier to maintain. I’m comfortable working independently or with cross-functional teams, and I often collaborate with frontend developers to ensure the entire application works smoothly from end to end. While my main focus is backend, I also have experience with React, which helps me understand how backend and frontend connect. If you're looking for someone who can take ownership of the end to end development, set up reliable cloud infrastructure, and deliver robust and well-documented APIs — I’d love to help.

🎁 𝗔 𝟭𝟬𝟬% 𝗿𝗲𝗳𝘂𝗻𝗱 𝗶𝗳 𝗜 𝘀𝗲𝘁 𝘁𝗵𝗲 𝘄𝗿𝗼𝗻𝗴 𝗲𝘅𝗽𝗲𝗰𝘁𝗮𝘁𝗶𝗼𝗻 𝗮𝗻𝗱 𝗰𝗮𝗻’𝘁 𝗱𝗲𝗹𝗶𝘃𝗲𝗿. 𝗡𝗼 𝗾𝘂𝗲𝘀𝘁𝗶𝗼𝗻𝘀 𝗮𝘀𝗸𝗲𝗱! I architect the AI systems other developers can't ship production RAG pipelines, multi-agent LLM apps and chatbots on a full-stack React, Next.js and Node.js base. 𝗣𝗿𝗲𝘃𝗶𝗼𝘂𝘀𝗹𝘆 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 (𝘁𝗼𝗽 𝟭% 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸) 🏅 AI architecture, not AI demos production multi-tenant platforms that scale 🚀 About I architect production AI agent systems multi-tenant LLM orchestration, agentic RAG, voice AI, and MCP servers for SaaS founders and agencies who need real systems, not chatbot demos. 15+ years of full-stack engineering means your AI doesn't just work in a Loom video; it scales, bills, and survives real traffic. 🌟 What I Deliver ✅ AI Agent Platforms Multi-tenant orchestration with multi-LLM execution (OpenAI, Anthropic, Gemini), agentic RAG, MCP servers, embeddable widgets, LangSmith tracing, cost/KPI analytics ✅ Voice AI & Conversational Agents Production voice with VAPI, ElevenLabs, Twilio inbound/outbound calling, transcription, workflow triggers, per-call cost attribution ✅ AI Workflow Automation n8n-powered agentic workflows connecting LLMs, CRMs, payments, and 70+ APIs into autonomous business processes ✅ Multi-Tenant SaaS Infrastructure Laravel/Node backends with per-tenant isolation, subscription billing, role-based access, React frontends scaling 100 to 100K users ✅ Enterprise AI Integrations Stripe, Salesforce, HubSpot, Go High Levek (GHL) ,Shopify, OpenAI, Anthropic, Gemini, ElevenLabs, VAPI, Twilio webhook routing, async queues, full observability 🏗️ What I Build AI Agent Orchestration Platforms Production multi-tenant systems that deploy, manage, monitor AI agents at scale: multi-LLM, agentic RAG (Pinecone/MongoDB), streaming chat, cost tracking, KPI dashboards, embeddable widgets. Voice AI & Conversational Automation Voice agents with ElevenLabs, VAPI, Twilio inbound/outbound calls, real-time transcription, post-call analysis, workflow triggers, per-call cost attribution. n8n Workflow Automation Builders No-code automation backed by n8n with drag-and-drop editors, multi-step agentic workflows, webhooks, 20+ tool integrations (Slack, Sheets, Asana, ClickUp, HubSpot). MCP Servers & Agent Tool Integration Custom Model Context Protocol servers giving AI agents tool-use, structured outputs, and secure access to internal data. Multi-Tenant SaaS Backends Laravel backends with per-tenant isolation, subscription billing, role-based permissions, REST APIs built to scale from first customer to thousands. React Frontends at Scale TypeScript React 18 with BLoC, real-time streaming (Socket-io + Pusher), embeddable widgets, browser extensions, visual workflow builders CI/CD deployed. API Integration Systems 70+ integrations across Stripe, Salesforce, HubSpot, Shopify, FedEx, VAPI, Twilio, OpenAI, Anthropic, Gemini webhook routing, async queues (Laravel Horizon), error tracking. 🍇 Signature Work 🔷 Studio98-ai AI Workforce Platform (flagship): Multi-tenant AI agent orchestration serving 50+ clients across sales, marketing, ops, support. LangChain orchestration with OpenAI/Anthropic/Gemini, agentic RAG via MongoDB/PostgreSQL, MCP server, n8n workflows, LangSmith tracing. React 18 frontend with 27 modules, embeddable chat widget, browser extension, visual workflow builder, real-time SSE streaming. 🔷 Rave 2.0 Multi-tenant SaaS retail platform with subscription management, analytics, drag-and-drop page builder. 🔷 Enterprise Jira Governance Multi-team Agile system for 50+ developers with workflow automation and executive dashboards. 🛠️ Core Tech Stack AI & Agents: LangChain · LangGraph · LangSmith · MCP · Agentic RAG (Pinecone, MongoDB) · OpenAI · Anthropic Claude · Gemini · Prompt Engineering Voice AI: VAPI · ElevenLabs · Twilio · Real-time Transcription Automation: n8n · Make · Webhooks Backend: Laravel 11 · PHP 8.1+ · Node.js · TypeScript · Nova · Sanctum · Octane · Horizon · Redis · MongoDB · PostgreSQL Frontend: React 18 · TypeScript · Vue.js · Inertia.js · Socket-io · Pusher Infra: Docker · AWS · GCP · Firebase · CI/CD Delivery: Scrum (PSM I) · Jira · Confluence · ACP-620 💡 Why Clients Choose Me ✅ AI architecture, not AI demos production multi-tenant platforms that scale ✅ End-to-end ownership agent architecture to deployment to team handoff ✅ 15+ years, 50+ AI agents in production, 24,000+ Upwork hours ✅ Multi-LLM, multi-tenant, multi-channel platform scale, not script scale ✅ Top Rated Plus with 100% JSS sustained, not seasonal Last updated: 11.06.2026

I'm a Design Engineer who builds premium, conversion-focused websites and dashboards in Next.js and React — the kind that load fast, rank on Google, and actually turn visitors into customers. I work the full path from Figma design to clean, production-grade code, so you get a polished interface and a maintainable codebase, not one at the expense of the other. Most developers either design or engineer. I do both, which means fewer handoffs, tighter execution, and a site that looks as good as it performs. Over 4+ years I've shipped 50+ production apps and earned Top Rated status with a 100% Job Success Score. What I work with: ⚡ Next.js 15 & React · Astro · Vue ⚡ TypeScript · Tailwind CSS ⚡ GSAP · Framer Motion · Scroll Animations ⚡ Figma → Code (UI/UX Design) ⚡ Sanity · Payload · MDX (CMS) ⚡ AI / Chatbot Integration ⚡ REST API Integration ⚡ SEO Optimization · Core Web Vitals ⚡ Vercel Deployment Industries I've built for: → SaaS & IT / Tech companies → Fintech & data platforms → E-commerce & jewellery brands → Real estate & property → Solar & energy → EdTech & online learning → Portfolios & personal brands → Company & agency websites → CV / analytics dashboards Core Web Vitals, sub-2s loads, mobile-first, and clean component architecture come standard on every build — not as add-ons. Available for fixed-price and hourly work. I respond within 24 hours. Let's build something fast, premium, and built to convert.