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Hi, I'm a professional Full Stack Javascript developer with 5+ years of experience building scalable, high-performance web applications. I specialize in modern JavaScript frameworks and backend technologies, delivering clean, efficient, and maintainable code. Frontend: - React (Next.js, Remix, Redux Toolkit, Zustand, MUI, React Router) - Vue 2 & 3 (Nuxt, Vuex, Pinia, Vue Router) - UI & Styling: TailwindCSS, Bootstrap, SCSS - Build: WebPack, Vite - Testing: Jest, Vitest, Playwright - API: Tanstack Query, RTK Query Backend: - Node.js (Express, NestJS) - SQL, MondoDb Other Skills: - TypeScript - Docker, AWS, Azure - JavaScript, HTML (semantic, SEO-optimized), CSS - Git I'm passionate about crafting fast, responsive, and user-friendly applications while following best practices in performance optimization, state management, and clean architecture. Let's discuss how I can help bring your project to life!

Senior front-end developer with 10+ years of experience building production web apps with Vue, React, TypeScript, and modern JavaScript. I help teams fix messy UI code, improve component architecture, ship polished responsive interfaces, and make complex features easier to maintain.

𝐈'𝐦 𝐚 𝐅𝐫𝐨𝐧𝐭-𝐄𝐧𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐞𝐫 𝐰𝐡𝐨 𝐬𝐩𝐞𝐜𝐢𝐚𝐥𝐢𝐳𝐞𝐬 𝐢𝐧 𝐜𝐫𝐞𝐚𝐭𝐢𝐧𝐠 𝐜𝐥𝐞𝐚𝐧, 𝐫𝐞𝐬𝐩𝐨𝐧𝐬𝐢𝐯𝐞, 𝐚𝐧𝐝 𝐩𝐢𝐱𝐞𝐥-𝐩𝐞𝐫𝐟𝐞𝐜𝐭 𝐥𝐚𝐧𝐝𝐢𝐧𝐠 𝐩𝐚𝐠𝐞𝐬. Tech Stack: 📍 Coding: - HTML5 - JavaScript (burger menus, modals, sliders, etc.) - TypeScript - React - React Router 📍 Styling: - CSS3 - SCSS - TailwindCSS - shadcn/ui

Hi, I'm Sergey - a senior full-stack web developer focused on sites, landings, and handoffs you can maintain after launch. I build work that earns trust and drives the next step you need - contact, quotes, intake, or bookings - for businesses that care about clarity, credibility, and a site your team can run after launch. ✨ What you get: a clear offer on the page, working forms and CTAs, mobile-friendly layout, and handoff you can actually maintain. 🛠 Work I take on: • Full-stack web apps (Next.js / React + Node.js APIs, auth, payments, integrations) • Business websites (WordPress, Squarespace, Tilda, Webflow) • Sites from Figma or your brief + brand assets • Landing pages and service sites • Site updates, forms, and SEO basics on your copy 📈 How I work: agreed scope in writing, preview links, fixed milestones, clean access handoff. Updates in Upwork messages. 🤝 Portfolio: business and service sites, landings, CMS builds, and full-stack projects with forms and APIs - see work attached to my profile. ⚙ React, Next.js, TypeScript, Node.js, PostgreSQL, Vercel - or the CMS that fits your team. Send your post or mockups with priority pages - I will reply with a short plan.

Shopify & Shopify Plus Developer | 10+ Years | 100% Job Success | 64+ Projects I build Shopify stores for beauty, jewelry, and fashion brands, specializing in the work that goes beyond standard themes: custom theme development, apps, extensions, and integrations that fit a store to how a business runs. I write clean, maintainable code and keep performance strong as a store grows. I've led Shopify teams in agencies and worked directly with merchants as a freelancer. Whether you're starting with a detailed Figma design or an early idea, I'll turn it into a production-ready Shopify solution. My work spans complete storefront builds, custom apps, complex integrations, and long-term technical partnerships—for both growing DTC brands and established Shopify Plus merchants. WHAT I DO Custom Theme Development & Enhancements • Build custom Shopify themes from scratch (Online Store 2.0) • Precise Figma-to-Shopify implementation • Responsive, accessible, SEO-friendly, performance-optimized code • Thorough QA before launch for a polished, reliable storefront • Optimize, debug, and modernize third-party and legacy themes Custom App & Extension Development • Shopify apps with custom admin dashboards (Admin API, GraphQL, webhooks) • UI extensions for checkout and the new customer accounts • Custom discount logic with Shopify Functions (Shopify Plus) AI-Powered Shopify Features • Custom Shopify apps powered by LLMs (Claude, OpenAI), built around your business, your data, and your workflow • Examples include product enrichment, AI-assisted merchandising, support assistants, internal admin tools, catalog management, and workflow automation • I advise on the right approach for your goals, then build a production-ready solution Integrations & Data • Reliable integrations with ERP, CRM, subscriptions (ReCharge), email marketing (Klaviyo), reviews, and analytics platforms • Two-way data, order, and inventory synchronization • Scalable use of metafields, metaobjects, and dynamic content Performance & Problem Solving • Core Web Vitals, mobile speed, and performance audits — covering app and third-party script overhead, not just theme code • Troubleshoot and resolve theme, app, checkout, and performance issues HOW I WORK I'm reliable, detail-oriented, and communicate clearly in English. I collaborate through Slack, Notion, Git/GitHub, and project trackers, and provide regular progress updates throughout a project. I write and review every line of production code, using AI (Cursor with Claude) to accelerate development — not to replace engineering judgment. I care about building solutions that are reliable, maintainable, and built to last — not just code that technically works. I'm looking for long-term collaborations where I can be a dependable technical partner. TECH STACK Shopify • Liquid, Shopify Functions, Admin API, Storefront API, Cart / Order / Checkout / Subscription / Discount APIs • Shopify CLI, UI extensions • ReCharge, Klaviyo AI • Custom AI app development with LLM APIs (Claude, OpenAI) • Shopify AI toolkit / MCP, AI-assisted coding (Cursor) Frontend • React, JavaScript (ES6+), Vue.js, Alpine.js • HTML / CSS (TailwindCSS, BEM, SASS), 2D/3D animations, Webpack Backend • Node.js, REST API / GraphQL, MongoDB, MySQL, Python Design & SEO • Figma, Adobe XD, Photoshop, Illustrator • GA4, Lighthouse, structured data / schema Infrastructure & Tools • AWS, DigitalOcean, Heroku • Git, Chrome DevTools, Unix shell If you have a project in mind, send me the details and I'll recommend the best way to approach it.

What you get working with me: ① Any job done within full stack development: PHP, Laravel, Node.js, React, Vue.js, Angular ② A SaaS or Logistics platform that works exactly the way your business operates. Any stack the project requires, no limitations. As a welcome bonus on Upwork get a FREE consultation from an architect level full stack developer. I am a Full Stack Developer and Managing Partner leading a small team of senior engineers. No middlemen. I scope the project, I ship it, I own the result. We are small – you don't pay an "agency tax". We use AI where it actually helps. No "95% done but stuck." No surprises at launch. Clean code, predictable timelines, working demos every two weeks. 𝐖𝐡𝐚𝐭 𝐈 𝐁𝐮𝐢𝐥𝐝 ➤ SaaS Platforms (MVP to Scale) As a Full Stack Developer, I own the entire platform — from database architecture to UI. Rapid MVPs: Your idea validated in weeks, with a robust core. Complex Logic: Multi-tenancy, RBAC, and secure data isolation done properly from the start. Modernization: Legacy or unstable systems refactored into something maintainable and fast. ➤ Logistics & Supply Chain (Deep Domain Expertise) I know logistics operations from the inside. Custom TMS / WMS: One unified platform instead of 5-10 disconnected tools. Real-time Operations: GPS tracking, warehouse management, route optimization, document automation (BOL, POD). ➤ Smart Automation & AI Integrations (Engineering Approach) I add AI where it solves a real problem — not where it looks impressive on a slide. LLM API Integrations: OpenAI, Claude, Gemini connected to your actual workflows. Agentic Workflows: Automation and AI integrated directly into business processes and products. 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 (𝗙𝗼𝗰𝘂𝘀𝗲𝗱 & 𝗦𝗰𝗮𝗹𝗮𝗯𝗹𝗲) - Back-End: PHP, Laravel, Symfony, Node.js (NestJS) - Front-End: React, Vue.js, Angular, TypeScript, JavaScript - Mobile: Flutter, React Native, Swift, Kotlin - API Development: Node/Express, Firebase, REST, GraphQL, etc. - Databases: MySQL, PostgreSQL, MongoDB, Supabase, Elasticsearch - AI Integrations: Anthropic Claude, OpenAI ChatGPT, Google Gemini, Llama, RAGs - Cloud: AWS, Google Cloud, Docker, Kubernetes 𝐖𝐡𝐲 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞? ✔️ Senior-Level Full Stack Developer on Your Project: you get my personal lead and a team of senior-only engineers. ✔️ System-First Approach: I define data flows and logic boundaries before writing code to ensure long-term stability. ✔️ Business-Driven Solutions: you get a product focused on ROI and operational efficiency. ✔️ Absolute Transparency: clear technical roadmaps and estimates, and 2-week delivery sprints with live demos. 𝐇𝐨𝐰 𝐖𝐞 𝐆𝐞𝐭 𝐒𝐭𝐚𝐫𝐭𝐞𝐝 ① Chat and/or Discovery Call: We analyze your vision, goals, and current bottlenecks. ② Technical Blueprint (48h): You receive a clear structure plan, roadmap, and fixed estimate. ③ Iterative Execution: 2-week sprints with working demos, keeping you in full control. Click "Message" to discuss your project. I'll provide an honest technical analysis of your idea and a FREE consultation to ensure your project is built to last.