You will get React & Next.js Performance Boost
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Project details
You'll get a measurable performance improvement - before/after numbers, not vague "I optimized it." With 9+ years of experience and a 100% Job Success Score, I've gotten React and Next.js apps 2–3x faster on Core Web Vitals.
My process starts with a full audit: Lighthouse, WebPageTest, and bundle analysis to find exactly where time is being lost. Then I fix it in priority order quick wins first (images, fonts, scripts), then deep work (code splitting, rendering strategy, caching). Everything is measured before and after.
Faster pages mean better SEO, lower bounce rates, and more conversions. The improvements I make are sustainable not tricks that break on the next deploy.
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My process starts with a full audit: Lighthouse, WebPageTest, and bundle analysis to find exactly where time is being lost. Then I fix it in priority order quick wins first (images, fonts, scripts), then deep work (code splitting, rendering strategy, caching). Everything is measured before and after.
Faster pages mean better SEO, lower bounce rates, and more conversions. The improvements I make are sustainable not tricks that break on the next deploy.
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Programming Languages
HTML & CSS, JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Localization, Performance OptimizationWhat's included $1,600
These options are included with the project scope.
$1,600
- Delivery Time 14 days
- Number of Revisions 0
37 reviews
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AB
Alex B.
May 17, 2026
Full Stack Developer for Clinical Platform
I’ve never seen such a high level of professionalism, strong communication, and attention to detail. I will definitely continue working together in the future.
AN
Andriy N.
May 8, 2026
Senior Full Stack Developer needed - AI Healthcare Platform
Igor did a great job improving our platform. He quickly resolved bugs, fixed data flow issues, and helped improve overall platform stability and performance.
Communication was smooth, delivery was on time, and the quality of work was excellent. Highly recommend and would gladly work together again.
Communication was smooth, delivery was on time, and the quality of work was excellent. Highly recommend and would gladly work together again.
AN
Andriy N.
Mar 7, 2026
Front End Developer React Developer
Igor is a great Front End developer. He delivered everything on time and with excellent quality. Communication was smooth and professional throughout the project. Highly recommended!
KM
Keith M.
Feb 10, 2026
30 minute consultation
EC
Ed C.
Dec 18, 2025
Prototype Designer/Developer for Thai Language Learning Game (Browser-Based)
About Igor
Front End Developer | React Developer | Full Stack Developer | SAAS
100%
Job Success
Zaporizhzhia, Ukraine - 4:30 pm local time
🔥 50 COMPLETED JOBS WITH ZERO NEGATIVE FEEDBACK
⭐️ Consistent 5-STAR REVIEWS & LONG-TERM CLIENT PARTNERSHIPS
💼 $200K+ earned on Upwork | ⏱ 8,300+ hours delivered | 🏆 100% Job Success Rate
🌍 40+ products shipped across 18+ countries | 🏅 15+ long-term client partnerships
Building a serious product takes more than a polished UI - it takes a Full Stack Developer who understands architecture, scalability, and business impact. I'm a senior Front End Developer and Full Stack Developer with 9+ years building high-performance web apps, SaaS platforms, landing pages, and mobile apps for startups and growth-stage companies with React, Next.js, and Node.js. I keep frontend and backend tightly integrated so every decision serves the business.
📊 Impact & Metrics
Products I've shipped serve 10K–100K+ monthly actives and handle 5M+ API requests/month. As a Front End Developer and React Developer I've cut load times 40–60%, lifted conversions 20–35%, and dropped bounce rates 25%+. Recent work: organic traffic +62%, TTI 2–3x faster, and a dashboard rebuild that grew weekly actives from 4K to 18K (+350%) in 4 months.
🏗 Architecture & Scalable Systems
As a React Developer I design scalable component systems with Redux or Zustand; with Next.js I build hybrid rendering - SSR, SSG, ISR, API routes - tuned for performance, SEO, GEO, and AEO. As a Full Stack Developer I work in Node.js, ExpressJS, and Python (Django, FastAPI), building REST APIs across PostgreSQL, MySQL, MongoDB, and Supabase, with WebSockets, Docker, and CI/CD on AWS or Vercel cutting release times 50%+. Modular patterns reduce technical debt and bug rates 30–40%.
🤖 AI Development, Agents & Automation
I build production-ready AI systems: AI Chatbots, AI Agents, AI Voice Assistants, AI Customer Support, and AI Content Generation - connected to real products, not demos. Using OpenAI GPT, Claude API, Gemini API, LangChain, LangGraph, LlamaIndex, and RAG with Vector DB, I ship multi-step reasoning pipelines, PDF/Document AI, AI Document Processing, and Recommendation Engines. I implement AI Workflow Automation, AI CRM Integration, AI Analytics Dashboards, and AI Search with RAG/CAG, MCP, and LangSmith observability - saving teams 15–25 hours/week.
📱 Mobile Development
As a Front End Developer I build cross-platform apps with React Native for iOS and Android - shared logic cuts delivery time 40%. Apps shipped hold 4.5★+ store ratings.
🎨 Design-to-Code
As a Front End Developer I turn Figma and Framer into pixel-perfect React interfaces with Tailwind CSS - landing pages, full websites, or redesigns. Consistent Lighthouse 95+ and LCP under 1.8s.
📈 Business-Oriented Engineering
As a React Developer I've refactored unstable React codebases into maintainable systems, shipped Next.js platforms that grew organic acquisition, built Stripe subscription and marketplace flows, and handled API integration, cutting infra overhead 20–30%. One Full Stack Developer engagement took a signup funnel from 90 to 240/month (+165%) while halving server costs.
⚡ Performance & Core Web Vitals
As a Front End Developer I treat LCP and TTI as real product metrics - 2–3x faster via code splitting, lazy loading, caching, and SSR/ISR. Pages from 6s+ to sub-2s, conversion +38%, bounce −25%.
🔧 Primary Stack
Frontend: React.js, Next.js, TypeScript, Redux, Zustand, Tailwind CSS, SCSS, Framer. Backend: Node.js, ExpressJS, Python (Django, FastAPI), REST, GraphQL, WebSockets. AI: OpenAI GPT, Claude API, Gemini API, LangChain, LangGraph, LlamaIndex, RAG/CAG, Vector DB, MCP, LangSmith. Mobile: React Native, native Android. Infra: AWS, Vercel, Docker, CI/CD, PostgreSQL, MySQL, MongoDB, Redis, Supabase. Need a React Developer for a complex SPA or a Full Stack Developer to own the whole product? The stack flexes to fit.
💡 Data-Backed Results at a Glance
✅ 60% faster load times via Next.js rendering & caching
✅ 35% increase in conversion rates through funnel-focused Front End Developer work
✅ 350% growth in active users on a React Developer dashboard rebuild
✅ 62% lift in organic traffic via SEO/GEO/AEO-optimized SSR/SSG
✅ 50% shorter release cycles after CI/CD automation
✅ 40% reduction in mobile delivery time through shared React Native logic
✅ 30% drop in technical debt and bugs via modular components
✅ 25% lower bounce rates after Core Web Vitals work
✅ 165% more signups on a Stripe SaaS funnel rebuild
✅ 95+ Lighthouse scores with sub-1.8s LCP
🤝 How I Work
Product-focused, clean architecture from day one, fast iteration without technical debt. As a Full Stack Developer partnered with 40+ founders, CTOs, and product teams, I prefer long-term partnerships. Looking for a Full Stack Developer, Front End Developer, React Developer or AI Developer who thinks in products? Let's talk.
Steps for completing your project
After purchasing the project, send requirements so Igor can start the project.
Delivery time starts when Igor receives requirements from you.
Igor works on your project following the steps below.
Revisions may occur after the delivery date.
Audit
I run Lighthouse, WebPageTest, and bundle analysis. I produce a prioritized list of issues with estimated impact for each.
Quick Wins
I fix the highest-impact, lowest-effort issues first: image optimization, font loading, render-blocking scripts.