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Yuliia U.
$35/hr
93% Job Success
$300K+ earned
Available now
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👋 Hi, I'm Julia - your reliable tech partner ✅ 9+ years in software development as React Developer , React Native developer , Full Stack React Node ✅ 41+ jobs on UpWork solely in React , Next , Node js and React Native stack as Full Stack React developer, Node js developer ✅ 155+ web and mobile projects delivered ✅ 20,500+ Upwork hours in React / Next.js / Node.js / React Native ✅ 75% repeat clients - partnerships lasting 6-18+ months ✅ 40+ MVPs released, 5-8 weeks from MVP to pilot launch with React Native , React developer , Node js developer ✅ 35+ in-house engineers, matching in 24 hours or less ✅ 2-week trial period - you risk nothing ✅ Products we support include platforms with 5M+ daily users My team helps companies hire in-house, CTO-approved engineers who join fast, take ownership, and deliver production-ready software. My goal: save up to 40% of your budget and still get a market-ready, stable, scalable product. Why teams choose us: 🔹 In-house, not freelance-marketplace roulette. Every engineer is personally screened and approved by our CTO before joining your project. 🔹 Speed without chaos. Engineer matched within 24h, weekly demos, code review and QA on every delivery. 🔹 Ownership. Our engineers don't wait for tickets - they flag risks, suggest architecture improvements, and drive the product forward. 📌 How we work: Discovery & technical planning → engineer matching within 24h → 2-week trial → weekly demos and reports → CTO-approved delivery with code review and QA → long-term support after launch. 🚀 React / Next.js / Full Stack We build SaaS platforms, marketplaces, dashboards, admin panels, CRMs, and scalable web apps as react developer, react js developer, nextjs developer, next js developer, web app developer react, full stack developer react node, and full stack developer supabase react. Stack: React, Next.js, Node.js, TypeScript, Supabase, PostgreSQL, Firebase, MongoDB, REST API, GraphQL, Stripe, OAuth, WebSockets, AWS, Vercel, Docker. MVP development, legacy code takeover, architecture modernization, Core Web Vitals, API integrations, payments, auth, subscriptions, user roles, production launch. A strong fit if you need a react developer, frontend developer react, web developer, full stack developer, mern developer, or backend engineer. 📱 React Native / Mobile iOS and Android apps as react native developer, react native developer expo, react native app developer, mobile app developer. React Native, Expo, Firebase, Supabase, Node.js, API-driven architecture. App takeover, maintenance, push notifications, App Store / Google Play releases, payments, backend integrations. Mixed environments: flutter developer, android developer. 🤖 AI SaaS / AI Development 25+ AI products and features shipped: AI SaaS, AI MVP, AI chatbot development, AI agent development, RAG chatbot, copilots. Stack: OpenAI API, Claude API, LLMs, RAG, prompt engineering, Generative AI, Python, FastAPI, pgvector, web scraping, automation, AI workflow validation. 🧩 Mixed-Stack Support Core focus: React, Next.js, Node.js, React Native, TypeScript, Supabase, AI. We also support wordpress, vue, angular, python developer, scala developer, and other web/mobile technologies. 🏆 Industries 📦 Logistics - 5+ projects: tracking, shipment dashboards, carrier/shipper workflows, maps 🏥 HealthTech - 4+ projects: medical booking, clinic platforms, patient flows 🛒 Marketplaces & E-commerce - 15+ projects: multi-vendor, Stripe, subscriptions, bidding, complex search 🏠 PropTech - 5+ projects: listings, booking flows, agent dashboards, rental platforms 🤖 AI Startups - 25+ products: chatbots, agents, copilots, OpenAI / Claude integrations 💰 FinTech - 3+ projects: Stripe Connect, billing, payment flows, invoicing 🎮 Gaming - 5+ projects, incl. 2 major global gaming brands: dashboards, analytics, real-time 📚 EdTech - 5+ projects: student dashboards, progress tracking, content platforms 📣 MarTech - 1 global market-leading project: analytics, segmentation, workflows ⚽ SportsTech - 10+ projects: live data, events, rankings, stats, mobile apps 🚀 Building a SaaS, MVP, marketplace, React app, Next.js platform, React Native app, or AI product? Click "Invite" or "Hire" - I'll help you clear the estimate or discovery phase within 24 hours or less.
Yuliia U. has worked .
Koitechs 💡 JavaScript experts 💡 React. js + Node. js
Associated with
Koitechs 💡 JavaScript experts 💡 React. js + Node. js
$700K+
earned
Maksym B.
$35/hr
100% Job Success
$10K+ earned
Available now
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Senior Full Stack Engineer with deep specialty in auction and marketplace systems. Production builds: Forty7 (NYC-inspired digital auction house for fine jewelry and watches), Faktastisch (high-traffic magazine, millions of pageviews per month). Open-source proof: the auction engine API repo (NestJS, PostgreSQL, Redis with concurrency-safe bidding, anti-sniping, full audit log) plus the auction engine frontend repo (React 18, TypeScript, Vite, WebSockets). Currently long-term on a marketplace contract through 2muchcoffee agency. Top Rated Plus, 100% Job Success, exclusive agency contractor. What I deliver: - Real-time auction and bidding systems: concurrency control, anti-sniping, audit logs, predictable behavior under load - Marketplace platforms: catalog, search, checkout, payments, admin tooling - Full-stack web applications: Angular or React frontends, NestJS or Node backends, PostgreSQL or MongoDB - High-traffic content platforms: SEO, performance, observability Stack: Angular, RxJS, TypeScript, React 18, Vite, NestJS, Node, PostgreSQL, Redis, WebSockets, REST APIs, GraphQL, Stripe API, real-time Sockets. Full Stack Developer, Senior Full Stack Developer, Marketplace Developer, Auction Developer, Angular Developer, NestJS Developer, Node Developer, React Developer, TypeScript Developer, Web Application Developer, Real-Time Developer.
2MUCHCOFFEE LLC
Associated with
2MUCHCOFFEE LLC
$4M+
earned
Denys H.
$35/hr
100% Job Success
$1K+ earned
Available now
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Ever wished your web app could be built faster than your coffee brews ☕? I turn complex ideas into production-ready solutions that scale. Whether you need a lightning-fast no-code prototype to test the market or a robust full-stack ecosystem, I bridge the gap between "concept" and "launch." With 7+ years of experience, I specialize in building secure and interactive applications tailored to business logic. My core stack includes React, Node.js, PHP (Laravel), and Python, backed by AWS cloud architecture. How I can help you: 🚀 Rapid MVP & Prototyping: Transitioning from No-Code (bubble/flutterflow) to scalable code or building lean MVPs from scratch to hit the market fast. 💻 Full-Stack Development: Scalable SaaS, Marketplaces, Booking platforms, and eCommerce systems. ⚙️ Enterprise Solutions: Dashboards, Inventory systems, and AI-powered automation to optimize your workflows. 🔌 End-to-End Tech: API integrations, Secure Auth, and Cloud infrastructure. The "Greenice" Advantage: By hiring me, you’re not just getting a developer — you’re getting the reliability of the Greenice team: Dedicated PM – For seamless communication. Lead Architect – For high-level technical guidance. QA Engineer – To ensure your product is bug-free before launch. From a quick prototype to a high-load enterprise platform — I ensure your project is a success from day one. 📩 Ready to build? Message me to arrange a brief discovery call.
Greenice
Associated with
Greenice
$4M+
earned
Polina I.
$20/hr
100% Job Success
$70K+ earned
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🚀 Ful Stack Developer | React, Next.js, Node.js, MERN Stack Expert 🚀 I’m a Full Stack Developer and Web Developer specializing in scalable web application development using React, Next.js, Node.js, NestJS, Express.js, Supabase, PostgreSQL, Firebase, MongoDB, and FastAPI. I help startups, SaaS companies, and growing businesses build modern products with scalable architecture, clean code, optimized performance, secure APIs, and reliable deployment workflows. I build high-performance SaaS platforms, AI-powered tools, dashboards, marketplaces, CRM systems, admin panels, and e-commerce platforms using modern frontend and backend technologies. My expertise covers complete product development — from responsive frontend systems to backend APIs, authentication systems, payment integration, database architecture and deployment, and cloud infrastructure. 💻 Full Stack Technologies & Expertise • React • Next.js • Node.js • NestJS • Express.js • MERN Stack • Supabase • Firebase • PostgreSQL • MongoDB • FastAPI • JavaScript & TypeScript • Tailwind CSS & Material UI • Vercel Deployment • Cursor, Claude Code, Lovable • Python Backend Services As a Full Stack Engineer, I build scalable frontend systems using React and Next.js optimized for SEO, responsiveness, speed, and maintainability. My frontend workflow focuses on reusable components, scalable UI architecture, modern UX, and performance optimization. On the backend, I develop scalable systems using Node.js, NestJS, Express.js, FastAPI, PostgreSQL, MongoDB, Firebase, and Supabase. I create secure APIs, authentication systems, admin dashboards, AI integrations, payment integration workflows, and scalable cloud architecture for SaaS products and enterprise applications. ⚡ API Development & API Integration I provide professional API Development and API Integration services for SaaS products, AI systems, marketplaces, and enterprise platforms. My experience includes: REST API Development GraphQL APIs Authentication APIs Third-party API Integration Payment APIs AI API Integration Scalable backend services I work extensively with Stripe, PayPal, OpenAI, Firebase, Supabase, CRM systems, and external business services. Every API Integration is built with scalability, security, maintainability, and long-term growth in mind. 🤖 AI Agent Development I build automation systems and intelligent products using modern AI Agent Development workflows. Experience includes: OpenAI integrations AI workflows AI automation tools Conversational systems AI-powered SaaS platforms AI assistants & productivity tools Using React, Next.js, Node.js, and FastAPI, I create AI-powered products optimized for automation, scalability, and user experience. ☁️ Supabase, Firebase & PostgreSQL I use Supabase and Firebase to build scalable backend infrastructure, authentication systems, cloud storage, and real-time applications. Supabase is a core part of my workflow for: PostgreSQL databases Authentication systems Realtime features API development Scalable deployment My PostgreSQL experience includes schema design, migrations, indexing, optimization, scalable database architecture, and deployment for production-grade web applications. 🛒 E-Commerce Platforms & SaaS Applications I develop scalable e-commerce platforms and SaaS applications with: Secure payment integration Authentication systems API Integration Admin dashboards Subscription systems Scalable backend architecture Using React, Next.js, Node.js, NestJS, Express.js, MongoDB, PostgreSQL, and MERN Stack architecture, I build reliable commerce systems optimized for scalability and performance. ⚙️ Additional Expertise ✔ Authentication systems ✔ Payment integration ✔ Database architecture and deployment ✔ Scalable SaaS development ✔ Responsive frontend development ✔ SEO optimization ✔ Performance optimization ✔ Vercel deployment ✔ Wordpress integrations ✔ Vue.js & Angular experience ✔ Python backend services 🛠 Modern Development Workflow I actively use Cursor, Claude Code, Lovable, AI-assisted development workflows, and modern CI/CD deployment pipelines to improve development speed, debugging, architecture planning, and code quality while maintaining clean and scalable software delivery. 🤝 Why Work With Me ✔ Strong Full Stack Development expertise ✔ Advanced React, Next.js, Node.js, NestJS, and Express.js experience ✔ Deep understanding of MERN Stack architecture ✔ Scalable frontend and backend systems ✔ Professional API Development & API Integration ✔ Strong Supabase, Firebase, MongoDB, and PostgreSQL expertise ✔ AI Agent Development solutions ✔ SaaS platforms & E-commerce systems ✔ Clean code and maintainable architecture ✔ Reliable communication and long-term collaboration If you’re looking for a Full Stack Developer experienced with React, Next.js, Node.js, NestJS, Express.js, MERN Stack, Supabase, API Development, Firebase, API Integration and more - contact me now!
Polina I. has worked .
Golden Team Soft
Associated with
Golden Team Soft
$6M+
earned
Roman B.
$75/hr
100% Job Success
$300K+ earned
Available now
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Top Rated Full Stack Engineer with 11+ years of experience building SaaS products, modernizing legacy systems, and delivering production web applications with Node.js, NestJS, React, Next.js, and TypeScript. I work across the full stack, with Node.js / NestJS on the backend and React / Next.js on the frontend, and also with MERN stack. Most of my work is not just building isolated features. It is taking a product from idea to production, modernizing legacy systems, improving architecture, cleaning up hard-to-maintain logic, and making sure the system is practical to operate and extend long term. I usually help clients with custom SaaS platforms, admin panels, dashboards, CMS, API integrations, automations, and workflow-heavy applications. I also build real-time features when the product depends on fast updates and event-driven behavior. When needed, I can add LLM features, build RAG pipelines, improve retrieval and embedding strategy, and design multi-agent workflows. One example: in my Oktogon Media work history, I helped design and deliver a custom CMS for multi-site content management that replaced several legacy CMS instances. The platform was built with React, Next.js, Node.js, NestJS, MongoDB, MySQL, Docker, Kubernetes, and AWS. As part of that work, I built ETL processes to migrate production data from a commercial CMS into the new platform. The new public frontend became 4x faster and met Lighthouse criteria, while the overall system made content operations more efficient and made new site launches easier. Another example: I built a queue management product from scratch using React, PostgreSQL, and Node.js. It includes real-time updates through socket events and priority-based event logic, and the system is used at Briuta Medical Center. My strengths are a product-oriented mindset, transparent communication, and practical decision-making. I think like a product owner, not just an implementer, so I tend to spot risks early, suggest improvements, and keep the work aligned with the business goal. I’ve worked across Healthcare, EdTech, learning systems, SaaS, media/content platforms, API integrations, and automations, but I’m open to strong products in any domain. If you need a senior full stack engineer who can build, modernize, and help move the product in the right direction, feel free to reach out. If you are impressed by my experience, but can't afford the hourly price, - contact me, and we can negotiate it and find a way to deliver to you the best quality at the market.
Roman B. has worked .
Rombl
Associated with
Rombl
Igor V.
$35/hr
100% Job Success
$200K+ earned
Offers consultations
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⭐️⭐️⭐️⭐️⭐️ TOP RATED PLUS | Front End Developer | React Developer | Full Stack Developer | Next.js Developer | AI Developer- building scalable, production-grade products used by thousands of users 🚀 🔥 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.
Igor V. has worked .
GoHard
Associated with
GoHard
$300K+
earned
Alina S.
$35/hr
100% Job Success
$40K+ earned
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👋 Hi there, I'm Alina! I'm a Full Stack Developer, web developer, and mobile app developer with 9+ years of commercial experience in software engineering, helping companies build scalable, secure, and high-performing digital products. My work follows ISO 9001 and ISO 27001 security standards, ensuring enterprise-level reliability. With 180+ successful projects and 20,000+ development hours, I specialize in complex Web and Mobile Application development, AI integrations, and cloud architecture. As a dedicated Full Stack Developer and Python Full Stack Developer, I help businesses automate workflows, optimize performance, and scale products using React, Node.js, Python, and AWS. Whether you need a skilled react developer or a versatile wordpress developer, I bring the technical expertise to deliver reliable systems. 🏆 Web Developer & Full Stack Developer Solutions: ✔️ 9+ years of experience as a Full Stack Developer building scalable web platforms, SaaS products, and AI-driven applications. ✔️ 180+ high-performance projects across eCommerce, SaaS, healthcare, fintech, and enterprise systems delivered as a Full Stack Developer AI specialist. ✔️ 20,000+ engineering hours as a Full Stack Developer, software engineer, and AI integrator. ✔️ Global experience across 40+ countries including the US, UK, Western Europe, and Australia. ✔️ Development speed increased by 60–70% using AI-assisted engineering workflows. ✔️ Backend and database optimization improving performance by up to 60%. ✔️ AI automation systems reducing manual operational work by up to 85%. ✔️ Cloud infrastructure improvements enabling 45% more concurrent users with reduced AWS costs. 📌 AI Systems & Automation: 🔹 Custom LLM and RAG architectures built with Python, LangChain, and vector databases by a Python Full Stack Developer. 🔹 AI chatbots and automation agents improving operational efficiency for SaaS and enterprise systems, delivered by a Full Stack Developer AI. 🔹 AI-assisted QA workflows reducing manual testing costs by 70%. 🔹 Model-agnostic LLM routing using OpenAI, Claude, and Gemini. 📌 Custom Web Development: 🔹 SaaS platforms built with Next.js, React, Node.js, and NestJS by an expert react developer and Full Stack Developer. 🔹 Secure web applications designed by an experienced web developer following ISO security standards. 🔹 Rapid MVP development using AI-first engineering approaches. 🔹 Custom CMS and scalable platforms implemented by a skilled wordpress developer. 📌 Backend Architecture & Cloud Infrastructure: 🔹 High-performance cloud architecture using AWS, Docker, and modern DevOps practices. 🔹 Database optimization with PostgreSQL and Supabase improving query speeds by 60%. 🔹 Microservices and CI/CD pipelines increasing system scalability. 🔹 Automated billing and internal automation systems built by a Python Full Stack Developer. 📌 Mobile & Cross-Platform Applications: 🔹 Cross-platform mobile applications using React Native and Flutter. 🔹 Backend-to-mobile data synchronization reducing latency and improving UX. 🔹 AI-powered recommendations and secure payment integrations. 📌 Scalable Architecture & System Optimization: 🔹 High-availability cloud infrastructure for scalable applications. 🔹 Advanced dashboards and admin panels using React, Tailwind, and modern UI frameworks. 🔹 Server-side rendering and caching strategies improving performance and scalability. ✅ 60–70% faster development through AI-assisted engineering workflows. ✅ ISO 9001 & ISO 27001 aligned development standards. ✅ 30% lower server costs through optimized backend architecture. ✅ Advanced AI integrations (GPT, Claude, LangChain) delivered by a Full Stack Developer AI. ✅ Rapid MVP delivery in 2–3 months by an experienced Full Stack Developer, react developer, and web developer. Looking for a Full Stack Developer | Full Stack Developer AI | Python Full Stack Developer who can design scalable systems, build reliable architecture, and turn ideas into production-ready products? Let’s connect! ☎️ 22.06.2026
HyggeSoftware Ou
Associated with
HyggeSoftware Ou
$200K+
earned
Vitaliy L.
$25/hr
100% Job Success
$20K+ earned
Available now
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📩 𝐒𝐞𝐧𝐝 𝐦𝐞 𝐲𝐨𝐮𝐫 𝐜𝐨𝐝𝐞𝐛𝐚𝐬𝐞 𝐨𝐫 𝐢𝐝𝐞𝐚 - 𝐈'𝐥𝐥 𝐝𝐞𝐥𝐢𝐯𝐞𝐫 𝐚 𝐟𝐫𝐞𝐞 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐜𝐨𝐧𝐬𝐮𝐥𝐭𝐚𝐭𝐢𝐨𝐧 & 𝐜𝐨𝐝𝐞 𝐚𝐮𝐝𝐢𝐭 (Available today - 3.08) I help businesses build scalable SaaS platforms & MVPs, AI-powered features, and modern web products using React, Node.js, Next.js, TypeScript, Python, and cloud technologies - 𝟑𝐱 𝐟𝐚𝐬𝐭𝐞𝐫 𝐫𝐞𝐩𝐨𝐫𝐭𝐢𝐧𝐠, 𝟐𝟎-𝟐𝟓% 𝐥𝐨𝐰𝐞𝐫 𝐨𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧𝐚𝐥 𝐜𝐨𝐬𝐭𝐬, 𝟐-𝟑𝐱 𝐟𝐚𝐬𝐭𝐞𝐫 𝐝𝐚𝐬𝐡𝐛𝐨𝐚𝐫𝐝𝐬, 𝐚𝐧𝐝 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬 𝐬𝐜𝐚𝐥𝐞𝐝 𝐭𝐨 𝟖𝟎𝟎𝐊+ 𝐮𝐬𝐞𝐫𝐬. 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: React.js • Node.js • Next.js • TypeScript • JavaScript • Vue.js • Redux Toolkit • Tailwind CSS • shadcn/ui • NestJS • Express • Python • Java • Go • REST APIs • GraphQL • PostgreSQL • MongoDB • Firebase • React Native • Flutter • Swift • Kotlin • AWS • GCP • Docker • Kubernetes • CI/CD • OpenAI • Claude API • LangChain • LlamaIndex 𝐑𝐞𝐜𝐞𝐧𝐭 𝐰𝐨𝐫𝐤𝐬: B2B analytics/demand forecasting SaaS - cut reporting time up to 3x, reduced operational costs 20-25% B2B visitor-tracking & CRM platform - cut dashboard load time 2-3x, automated lead handoff via HubSpot/ERP integration LegalTech platform (web + mobile + real-time chat) - booking time cut from days to minutes, 30-40% lower dev cost vs. full rebuild AI-powered learning platform (800K+ users) - study calendar, quiz engine, and personalized study sessions 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐢𝐞𝐬 𝐈'𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡: ✔️ SaaS & B2B Platforms ✔️ Legal Tech ✔️ E-commerce ✔️ EdTech ✔️ Consumer Mobile Apps ✔️ MVP 𝐖𝐡𝐲 𝐜𝐥𝐢𝐞𝐧𝐭𝐬 𝐜𝐡𝐨𝐨𝐬𝐞 𝐦𝐞: ✅ 10+ years of building SaaS platforms & MVP ✅ 94% of projects delivered on time and within scope ✅ 15-30 minute response time for critical tasks ✅ Proactive communication, clear technical ownership ✅ Comfortable working inside existing/legacy codebases, not just greenfield builds ✅ Worked with 9+ clients across the USA, Australia, and Europe Ready to build something that actually works? Send me your project details, and let's turn it into results.
Vitaliy L. has worked .
VRB Tech
Associated with
VRB Tech
$1K+
earned
Daria B.
$35/hr
100% Job Success
$60K+ earned
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🏆 Why I'm a Top-Rated Full Stack Developer & .NET Developer 8+ years as a Full Stack Developer and .NET Developer, 60+ web apps shipped for US, UK and EU clients
 I’ve earned +$60K on Upwork as a C# Developer and .NET Developer, 100% Job Success Score
As a Full Stack Developer, I've shipped 40+ releases combining React, Angular and ASP.NET Core
As a C# Developer, I cut API response times by 45% and infrastructure costs by 30% for a fintech client
As a .NET Developer, I migrated 3 legacy monoliths to .NET Core microservices, +70% deployment speed 💥 Recent win — as a Full Stack Developer and C# Developer, I rebuilt a logistics platform using .NET Core, Angular and MySQL, cutting order processing time by 55% and lifting client retention by 22%. 🟢 Most business platforms are slow, hard to scale and expensive to maintain. With 8+ years as a .NET Developer, C# Developer and Full Stack Developer, I architect scalable web developer solutions on .NET, Angular, React and Python stacks that turn technical debt into growth 🟢 📩 Send me your project brief — I'll reply with a free technical review within a few hours, covering architecture, performance and security. ⭐️⭐️⭐️⭐️⭐️ "She's an outstanding .NET Developer and Full Stack Developer. Reliable, communicative, and delivers clean, production-ready C# code every time." 🎯 WHY CLIENTS CHOOSE ME AS A FULL STACK DEVELOPER I'm a Full Stack Developer, .NET Developer and C# Developer with full-cycle ownership — from database architecture and API design to pixel-perfect frontends. As a C# Developer, I write clean, testable code following SOLID principles, and as a Full Stack Developer I make sure the entire product, not just one layer, actually works for your users. ✔️ .NET Core & C# — as a .NET Developer and C# Developer: scalable ASP.NET Core APIs, background services, .NET MAUI apps
✔️ Frontend — React, Angular, Vue.js, jQuery, built for speed and clean UX
✔️ Full Stack Development — as a Full Stack Developer, connecting .NET, Node.js and Python backends to JavaScript frontends
✔️ Web Developer Services — as a web developer, WordPress, Laravel and PHP sites alongside custom .NET apps
✔️ Database Architecture — MySQL, SQL Server, API Integration for data-heavy systems
✔️ Cloud & DevOps — Azure, AWS, Docker, CI/CD, supporting .net full stack developer and full stack developer react deployments 📊 RESULTS THAT SPEAK 🔶 Fintech Platform: as a .NET Developer and C# Developer, -60% transaction errors, 99.9% uptime via a full .NET Core rebuild
🔶 E-commerce Marketplace: as a Full Stack Developer, React + .NET Core APIs, +28% checkout conversion, 3x page load speed
🔶 Healthcare SaaS: as a senior .net developer, HIPAA-compliant rebuild, -40% manual admin work ⚙️ TECH STACK — WHAT I ACTUALLY BUILD ✔️ As a C# Developer, I build backend services and APIs in C#, .NET and .NET Core
✔️ As a .NET Developer, I build enterprise systems on .NET Framework, deploy cross-platform apps with .NET MAUI, and ship RESTful APIs with ASP.NET
✔️ As a Full Stack Developer, I build frontend interfaces in React, Angular, Vue.js and JavaScript, and add type safety with TypeScript
✔️ As a Full Stack Developer, I build backend logic in Node.js and Python, and CMS-driven sites in PHP, Laravel and WordPress
✔️ As a web developer, I build responsive layouts with HTML5, CSS 3, Bootstrap and jQuery
✔️ As a Full Stack Developer, I build and manage data layers in MySQL and SQL Server 💼 EVERY PROJECT AS A FULL STACK DEVELOPER INCLUDES ▪️ Clean, well-documented C# and .NET code with automated testing
▪️ Direct communication, just a senior C# Developer / .NET Developer working on your project
▪️ Ongoing support after launch as your long-term Full Stack Developer and .NET Developer partner 🏭 INDUSTRIES Fintech · Healthcare · E-commerce · Logistics · SaaS · Real Estate · EdTech 🔎 ALSO EXPERIENCED AS — EVERY ROLE, PROVEN TWICE ✔️ As a react developer, I build interactive dashboards for SaaS platforms. As a react developer, I also rebuild legacy UIs for speed and scale.
✔️ As a python developer, I build backend APIs and automation scripts. As a python developer, I also ship data-processing pipelines for reporting tools.
✔️ As a java developer, I build backend modules for enterprise systems. As a java developer, I also debug and refactor legacy Java codebases.
✔️ As a blockchain developer, I build and audit smart contracts. As a blockchain developer, I also integrate wallet and token logic into existing platforms.
✔️ As a mobile app developer, I build cross-platform releases for iOS and Android. As a mobile app developer, I also ship post-launch updates and bug fixes.
deployment pipelines.
 🚀 LOOKING FOR A RELIABLE FULL STACK DEVELOPER OR .NET DEVELOPER? 👉 Share your project details and I'll reply with a clear technical plan. Hire a proven .NET Developer, C# Developer and Full Stack Developer who ships secure, scalable, production-ready software — on time, every time. 📅 Last updated: 04.08.2026
NVCoding
Associated with
NVCoding
$50K+
earned
Ihor B.
$40/hr
100% Job Success
$700K+ earned
Start of list.
End of list.
👋 I'm a Full Stack Developer with 10+ years of experience as a Java and PHP software engineer. Over the past 9 years, I've also focused on frontend frameworks, working extensively with Spring, Laravel Yii Vue and React Prior to that, I gained valuable experience with CMS systems like Opencart and WordPress. 🚀 I've had the opportunity to collaborate with both small and large international teams (10+ members) and have developed expertise in project management tools such as Jira, Trello, and VCS. Additionally, I'm proficient in Linux systems and CI/CD processes. Throughout my career, I've worked on high-load systems, built server-side high-capacity applications, and developed complex multi-platform user interfaces.👍 💪 My technical Full Stack Developer skill set includes: ➜ Java Kotlin and PHP : 10+ years of experience with PHP ( Laravel Yii Symfony Zend ) and Java (Core/EE Vaadin Spring ) ➜ Frontend Frameworks: Experience with Vue.js React Nuxt.js Next.js Vuetify and Cordova specializing in creating responsive and usable interfaces. ➜ JavaScript and TypeScript: Strong skills in JavaScript and TypeScript to create dynamic and efficient applications. ➜ Backend Development: Experience with Node.js Express.js and AdonisJS to create scalable server-side solutions. ➜ Databases: Knowledge of MySQL PostgreSQL Redis MongoDB and others, optimizing database performance. ➜ API development and integration: Extensive experience in creating and integrating RESTful and GraphQL APIs, including third-party services such as Stripe and Twilio, etc. ➜ AI Integration: Hands-on experience integrating AI-based features. ➜ DevOps and tools: Proficient in Git, Docker, Jenkins, and Jira, ensuring CI/CD and project management runs smoothly. 📌 When you choose to work with me ( Experienced Full-Stack Developer ), you’re partnering with a developer who not only understands your goals but is also dedicated to delivering outstanding solutions. I place a strong emphasis on customer satisfaction, and my commitment to engineering excellence ensures that I create value at every stage of the project.🚀 🏆 Our experience in Full-Stack development : ✔️ 10+ years of experience in web and mobile Full Stack development ✔️ 250+ projects for startups, SaaS platforms E-commerce + Marketplace, Booking Platforms, MVPs, AI chatbots / AI solutions ✔️ 22,574+ hours worked on Upwork ✔️ 42+ countries we operate in providing top-notch web development solutions ✔️ AI & automation ready - experience with AI chatbots, OpenAI integrations, and content automation ✔️ From idea to launch - UI/UX design, frontend & backend development, QA, and post-launch support ✔️ Flexible and client-focused - personalized approach, clear communication, and full dedication to results 📌Full-Stack Development AI & Chatbot Development Expertise ( Full-Stack Developer ) 🔸 Extensive experience in building AI-powered solutions, including custom GPT-based chatbots, document analysis tools, and intelligent automation systems 🔸 Integration with OpenAI API (GPT-3.5/4) for chatbot creation, semantic search, text summarization, language translation, and prompt-driven workflows 🔸 LangChain & Prompt Engineering – building multi-step, context-aware interactions for advanced conversational agents 🔸 Real-world use cases: Legal & medical document parsing, customer support bots, smart assistants for booking/e-commerce platforms 🔸 Secure & scalable architecture – including role-based access control, user session management, and protected endpoints for AI services 🔸 Hybrid solutions – AI integrated into full-stack applications (React / Vue + Node.js / NestJS) with real-time data flow and third-party APIs (Twilio, Slack, Stripe, CRM systems) 🔸 Cloud-ready & optimized – deployed via AWS, Vercel, Supabase, with performance monitoring and cost-effective API usage strategies 🔸 100% rapid prototyping to production – from PoC to polished tools with clean UI/UX and user-centric flow 🔸 Continuous collaboration with product teams to refine AI logic and ensure high relevance and response quality 🔸 AI Tools I Use- Botpress / Lovable / Cursor Bolt.new / Deepgram / n8n / Make / Zapier 📌 Full-Stack Web & SaaS / E-commerce Development Expertise ( Full-Stack Developer ) 🔹 10+ years of hands-on experience in building scalable web & mobile applications 🔹 250+ completed projects - from MVP to production-ready SaaS platforms 🔹 Full product cycle: from idea validation and prototyping to launch and post-release support 🔹 Modern stack: Vue \ Nuxt, React \ Next.js Node.js JavaScript TypeScript, NestJS, Node js PostgreSQL, MongoDB, AWS, Supabase & more 🔹 AI Integration: OpenAI, LangChain, chatbot development, prompt engineering, GPT-based tools 🔹 Marketplace, E-commerce, Booking Platforms - tailored logic, secure payments, real-time updates 🔹 API Integrations: Stripe Slack Twilio OpenAI CRM systems, social media API 🔹 Efficient & secure architectures -clean code modular structure role-based access
Ihor B. has worked .