112 projects, 100% success rate. I don't take on work I'm not confident I can deliver. I help founders and teams turn an idea (or a half-working prototype) into a production SaaS or EdTech platform that actually ships and gets used — not just demoed. Most of what I build sits at the intersection of full-stack web development and AI: RAG systems, AI agents, chatbots, voice apps. But the AI is only there when it earns its place — if a plain database query is the right answer, that's what you get. Projects I'm proud of: 💡 An adaptive SAT/ACT preparationplatform built with React, Node.js, and Python, powered by the OpenAI API and developed with input from Stanford PhDs — it turns raw practice scores into a learning path that adjusts after every session. 💡A RAG-powered document search tool, built with Python and LangChain and connected straight into SharePoint and Dynamics 365, that indexed 300,000+ internal files and cut research time by 75%. 💡A HIPAA-compliant AI note-taking tool, built with Node.js and Whisper on a secure cloud backend, that turns a psychiatrist's spoken session straight into a structured clinical note — saving hours of their paperwork time daily. 💡A voice-controlled drive-thru ordering system, built with React Native and Node.js, now running in real locations and cutting order processing time by 30%. 💡A GDPR-first Zendesk AI copilot, built with Node.js and the OpenAI API with a custom data-scrubbing pipeline, that drafts agent replies from ticket history while stripping sensitive customer data before it ever touches the AI model. How I work with clients I'm direct and to the point — you'll get plain answers on scope, cost, and timeline, and if something in your plan won't work, I'll say so early, not after the invoice. I think about your project with a business mindset first: what needs to ship, what it needs to earn or save you, and what can wait — not just what's technically fun to build. No jargon dumps, no vague "it's in progress" updates. Full Stack Development Across Every Stack As a Full Stack Developer Python and Python Full Stack Developer, I build AI backends with Django, FastAPI, and Flask alongside React frontends. As a Full Stack Developer React and Full Stack Developer React Node, my default stack for new SaaS builds is React/Next.js + Node.js and TypeScript. As a Full Stack Developer AI, I fold LLM and RAG features directly into that same codebase instead of bolting them on as a separate service — working with OpenAI, Anthropic Claude, Gemini, Mistral, and Llama models, orchestrated through LangChain, with vector databases like Pinecone and Elastic Search grounding responses in real data instead of guesses. Where a project needs voice, I bring in Whisper, ElevenLabs, and VAPI for speech-to-text and real-time voice AI, and I build autonomous AI agents and multi-step workflows using tools like Hugging Face and PyTorch when custom model work is called for. For projects on a different foundation, I work as a Full Stack developer PHP and Full Stack Developer Laravel on legacy systems or client-mandated stacks, and as a WordPress Full Stack developer when a CMS site needs custom functionality beyond themes and plugins. I've also worked as a Webflow developer for fast, no-CMS-overhead marketing sites and landing pages. Whether you need a Full Stack Web Developer for a browser-first product or a Full Stack app developer for something React Native-based on mobile (with Swift and Kotlin where a fully native module is needed), I own the project front-to-back — design, build, ship, and support. On the data and infrastructure side, I work with PostgreSQL, MongoDB, MySQL, and Supabase, deploy on AWS, Microsoft Azure, and Google Cloud Platform, and build with compliance in mind from day one — HIPAA, GDPR, SOC 2, and PCI-DSS — for HealthTech, EdTech, and enterprise SaaS clients who can't afford to get that part wrong. If your project needs someone who'll own it end to end, send over what you've got — idea, spec, or prototype — and let's see if we're a fit.

⭐️⭐️⭐️⭐️⭐️ 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, 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. As a web app developer and SaaS developer, 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 as a full stack web developer and SaaS developer. 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 as a web developer, web app developer, and full stack web developer. 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. 💎 Whether you need a front end developer React, Shopify front end developer React, React Native Full Stack engineer, mobile app developer, web developer, web app developer, SaaS developer, full stack web developer, Webflow expert, or full stack developer Next.js partner, I'd be happy to discuss your project!

🏆 Top 3% of Freelancers - Top Rated Plus 💎 10+ Years as Node.js Developer, Backend Developer, Full Stack Developer, Web Developer ⭐ Can do anything with Node.js, React, Next.js, MERN, JavaScript, TypeScript, ExpressJS, MongoDB, Python, Vue.js, React Native, RESTful API & AI integration "Anna is an exceptional developer! Our project flourished under her expertise. She's detail-oriented, creative, and a pleasure to work with. Communication was seamless, making the collaboration effortless. We highly endorse Anna and eagerly anticipate future collaborations." - Max A., NDA Hi! I'm Anna, a senior Node.js developer and backend developer with 10+ years building scalable web applications, SaaS platforms, RESTful APIs, and enterprise systems. Whether you need a dedicated Node.js developer, a node.js backend developer, or a full stack developer who owns the entire product - I deliver production-ready solutions built to scale. As a back end developer Node.js and full stack web developer, I work across the complete stack: from database architecture to pixel-perfect UI. My core stack: Node.js · ExpressJS · React · Next.js · TypeScript · JavaScript · MongoDB · MySQL · PostgreSQL · Vue.js · React Native · Python · PHP · WordPress · HTML · CSS 3 · Supabase · GraphQL · AWS · Docker 🔹 What I Do Best as Node.js Backend Developer As a Node.js developer and backend developer with enterprise-level experience, I specialize in: ✅ Back-End Development & Backend NodeJS Architecture - Scalable Node.js services, microservices, and backend nodejs systems built with ExpressJS, REST, and GraphQL. As a node.js backend developer, I design APIs that are fast, secure, and cloud-ready. Python backend and supabase backend integrations included. ✅ Full-Stack Development & Software Development - End-to-end web development as a full stack developer: React / Next.js frontends powered by robust Node.js backends. Full stack nodejs, react node.js, vue.js node.js, and node.js next.js delivery. Also available as a python full stack developer for AI-heavy projects. ✅ AI Integration & AI Model Integration - Embedding AI integration and AI model integration into Node.js, Python, and React applications. Full stack developer AI workflows, including LLM-powered features, intelligent automation, and app developer with AI capabilities. ✅ RESTful API Design & API Integration - As a backend engineer and back end developer Node.js, I build and integrate RESTful APIs, GraphQL endpoints, and third-party services. Experienced with Supabase, Airtable, and postgresql supabase javascript rest json pipelines. ✅ MVP & SaaS Development - From MVP app development to production SaaS: full stack developer SaaS platforms, no code MVP consultation, mobile app MVP, and scalable multi-tenant architecture as a fullstack developer node.js. ✅ Mobile & Front-End Development - React Native mobile apps, Vue.js node interfaces, react nextjs dashboards, and HTML/CSS 3 UIs. React developer with node.js experience across web and mobile. Also: react native mobile, front end developer react, html website developer. ✅ DevOps, Cloud & Security - AWS, Docker deployments; database design with MongoDB, MySQL, PostgreSQL, Supabase. Performance optimization and security hardening for every backend nodejs system I deliver. ✅ QA & Testing - QA development is built into every project. I write tests, perform code reviews, and validate backend nodejs services and React frontends before delivery - so you ship with confidence, not crossed fingers. 💡 Projects I'm Proud Of 🔹 SaaS Platform - As lead Node.js developer and node.js backend developer, built a MERN-based platform with subscription billing, multi-tenant architecture, and cloud pipelines. Increased user engagement by 40% and contributed to $1.2M+ ARR growth after launch. 🔹 E-commerce System - Delivered checkout flows as a full stack developer using React and Node.js APIs. Integrated payments, analytics, inventory sync, and fulfillment services. Boosted conversion rates by 25% and increased monthly revenue by $480K through frontend optimization. 🔹 Enterprise Dashboard with Admin Panel - As a node.js backend developer and react developer, built real-time dashboards with Next.js, GraphQL, and Node.js. Improved system throughput by 50% and reduced operational processing costs by 32%. 🚀 Why Work With Me? ✔ 300+ projects as a Node.js developer, backend nodejs engineer, and full stack developer ✔ 150+ satisfied clients across E-commerce · SaaS · FinTech · EdTech · Healthcare · Real Estate · Logistics · Startups ✔ Long-term partner from MVP to enterprise - I'm the Node.js developer and full stack developer who stays, scales, and delivers 📩 Need a Node.js developer, backend developer, or full stack developer for a custom solution? Invite me to the job or send a direct message and let's build something great. 📆 Last Updated: 8/10/26

Concerned about poor app performance impacting your bottom line? Research indicates that 53% of users will abandon an app if it takes more than three seconds to load. I am a Senior Ruby on Rails developer with a 8 years of experience in web application development, with a deep understanding of the Ruby on Rails framework, I am committed to delivering exceptional results and providing efficient solutions to your projects 𝐌𝐘 𝐏𝐑𝐎𝐅𝐄𝐒𝐒𝐈𝐎𝐍𝐀𝐋 𝐀𝐂𝐇𝐈𝐄𝐕𝐄𝐌𝐄𝐍𝐓𝐒 𝐀𝐑𝐄: 1. Spearheaded the successful delivery and launch of 25 sophisticated Ruby on Rails web applications, ensuring seamless functionality and adherence to client specifications, resulting in high client satisfaction rates 2. Orchestrated performance optimization initiatives, implementing cutting-edge strategies that led to a remarkable 42% reduction in page load times, enhancing user experience and increasing user engagement 3. Guided a multidisciplinary development team in the seamless migration of a complex legacy system to Ruby on Rails, streamlining operations, improving system efficiency, and generating substantial cost savings in maintenance and support 4. Implemented rigorous security protocols and industry best practices, fortifying Ruby on Rails applications against potential cyber threats and reducing the risk of data breaches by a significant 50%, safeguarding sensitive user information 5. Demonstrated active involvement in the Ruby on Rails community by making impactful contributions to open-source projects. Garnered recognition for 3 notable code contributions, widely adopted by the community, and enhancing the overall functionality and reliability of the Ruby on Rails ecosystem 𝐖𝐇𝐀𝐓 𝐌𝐘 𝐂𝐋𝐈𝐄𝐍𝐓𝐒 𝐒𝐀𝐘 𝐀𝐁𝐎𝐔𝐓 𝐌𝐄: ⭐️ «Vladimir delivered exceptional results for our healthcare project. Gotoinc’s expertise in Ruby on Rails development exceeded our expectations. Their attention to detail, adherence to coding best practices, and a strong focus on security ensured the protection of sensitive patient data. Their professionalism, effective communication, and timely delivery were impressive. We look forward to future collaborations» - Sarah, CTO ⭐️ «We are highly satisfied with Gotoinc Team’s work on our e-commerce platform. Their deep knowledge of Ruby on Rails and e-commerce best practices resulted in a robust, scalable, and user-friendly web application. Their optimization techniques improved performance, leading to faster page load times and increased conversions. Their proactive communication and attention to detail made the project a success. We highly recommend the Gotoinc team for e-commerce projects» - Alex, Co-Founder 𝐇𝐎𝐖 𝐓𝐇𝐄 𝐇𝐈𝐑𝐈𝐍𝐆 𝐏𝐑𝐎𝐂𝐄𝐒𝐒 𝐋𝐎𝐎𝐊𝐒 𝐋𝐈𝐊𝐄: There are two options for collaborating with Gotoinc: - Talents-as-a-Service model a dedicated expert(-s) on a subscription basis. - Project-Based Collaboration model we deliver a certain scope or solution in a pre-defined timeline/budget. 𝐇𝐨𝐰 𝐭𝐨 𝐬𝐭𝐚𝐫𝐭: 1. Having an intro, where we identify your request 2. Our team identifies specific Talent or Team for your request 3. We deeply research your request and outline unique collaboration terms 4. Gotoinc presents your unique proposal and negotiates it with You 5. We sign a contract 6. We kick off our ongoing collaboration 💻 𝐑𝐮𝐛𝐲: Ruby, Rails, Sinatra, Padrino, Grape, Sidekiq, Nginx, RSpec, Capybara, Rubocop, Capistrano, Unicorn, Puma, Elastic Search 🔧Databases: PostgreSQL, MySQL, SQLite3, Redis 📊 Web Servers: Apache, Nginx 💻JavaScript JavaScript, ES 6/7, React, Vue, Jasmine, Handlebars, JSX, SKIM 📈HTML/CSS HTML5, CSS3, SCSS, Bootstrap, HAML, SLIM 📡 VCS: Git (Github, Bitbucket) 🆙 If you are interested in discussing your project with me, make sure to click the 👉🟢INVITE🟢 button, and let’s talk 🤝 𝐇𝐢𝐠𝐡𝐥𝐢𝐠𝐡𝐭𝐞𝐝 𝐒𝐤𝐢𝐥𝐥𝐬: Ruby on Rails Development, Full-stack Web Development, MVC Architecture and RESTful APIs, Front-end Technologies (HTML5, CSS3, JavaScript), Responsive and Mobile-first Design, Database Design and Implementation (PostgreSQL, MySQL), User Authentication and Authorization, Integration of Third-party APIs, Deployment to Cloud Platforms (Heroku, AWS), Test-driven Development (TDD), Agile Methodologies (Scrum, Kanban), Version Control Systems (Git, GitHub), Project Management and Collaboration Tools (Jira, Trello), Documentation and Code Commenting Last updated: March, 2026

🏆 𝗧𝗼𝗽 𝟭% 𝗨𝗽𝘄𝗼𝗿𝗸 Web Developer | 𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 𝗣𝗹𝘂𝘀 🏆 • 𝟭𝟱+ 𝘆𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲, • more than hundred 𝟱 𝘀𝘁𝗮𝗿 proven feedbacks at UpWork • 4500+ working hours at UpWork • Clutch Top Html5 Developer 2026 World Award • Clutch Top WordPress Developer 2026 Ukraine Award i’m Experienced Senior Web Developer. I build fast, secure, and scalable websites using HTML, JavaScript, PHP, WordPress and Web Design. My focus is on delivering solutions that drive measurable business results: — Custom WordPress development (themes, plugins, WooCommerce integration). — Frontend development with clean, responsive HTML/CSS and modern JavaScript. — Backend solutions in PHP for dynamic and high‑performance applications. — Speed optimization (90+ Google PageSpeed) and SEO‑ready architecture. With 15+ years of experience and 100+ successful projects for clients across the US and Europe, I combine technical expertise with business understanding. My goal is not just to code a website, but to create a digital product that helps you grow. i’m certified WordPress developer by TemplateMonster certification.templatemonster .com/certificates/c1e72582ddfb2a2af92277df25392a44/ My skills: ✅Html5, Css3, Bootstrap - 15 years of exp ✅Php - 12 years of experience ✅React - 7 years of experience ✅Node.js - 5 years of experience ✅JavaScript - 14 years of experience ✅WordPress - 15 years of experience ✅WooCommerce - 10 years of experience ✅Web Design - Figma/XD/PSD - 12 years of experience 𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝗝𝗼𝗶𝗻 𝟭𝟬𝟬+ 𝗦𝗮𝘁𝗶𝘀𝗳𝗶𝗲𝗱 𝗖𝗹𝗶𝗲𝗻𝘁𝘀? Click on the 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 or 𝗜𝗻𝘃𝗶𝘁𝗲 𝘁𝗼 𝗝𝗼𝗯 button on top-right corner. 🤝 Some more of my Website and Web App Development skils: Website development: ✅Web Design - Figma/XD/PSD ✅Html5, Css3, Bootstrap ✅Php ✅React ✅WordPress website development ✅WordPress custom theme development ✅WordPress custom plugin development ✅WordPress api integration E-Commerce development: ✅WooCommerce custom development ✅Craft CMS development ✅Shopify development ✅Shopify Pro development ✅Wix website development ✅Magento custom development ✅Joomla website development ✅PrestaShop development Web Application development: ✅Laravel development ✅React js development ✅MERN stack development ✅JavaScript (ES6) development ✅TypeScript development Backend development: ✅Node.js development ✅Ruby on Rails development ✅Python development ✅Php development Moblie App development: ✅React Native development ✅Flutter development ✅iOS native development ✅Android native development ⭐️⭐️⭐️⭐️⭐️My most famous clients: NINTENDO, BOSS Audio, ICVR io ⭐️⭐️⭐️⭐️⭐️i developing websites and apps that gives 🎯 PROFIT for my clients. ⭐️⭐️⭐️⭐️⭐️After starting our collaboration revenue of my clients grow by 🎯 $30M per year There are 100+ REAL 𝗧𝗲𝘀𝘁𝗶𝗺𝗼𝗻𝗶𝗮𝗹𝘀 showing why clients trust me to build their websites and apps. Want to 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲 𝗶𝘁 𝘆𝗼𝘂𝗿𝘀𝗲𝗹𝗳? Click on the 𝗠𝗲𝘀𝘀𝗮𝗴𝗲 or 𝗜𝗻𝘃𝗶𝘁𝗲 button and let’s start 🤝 Keywords: Website Development, Website Development for Startup, MVP Development, Frontend Developer, Frontend Engineer, Frontend Dev, Front End Developer, Backend Developer, Full-Stack Developer, Wordpress Custom Development, Wordpress Plugin Developer, Wordpress ACF Developer, WooCommerce Custom Developer, WooCommerce Developer, HTML Developer, HTML/CSS Developer, HTML Website, Web App Development, Wordpress Page Speed Optimisation, WordPress Performance Optimisation , Chart.js, D3.js, React Developer, React.js Developer, Magento Developer, Figma to Html, Figma to WordPress, Small Business Website, Middle Business Website, Landing Page Development, Web Design, Web Designer

Skilled 𝐅𝐮𝐥𝐥-𝐒𝐭𝐚𝐜𝐤 Engineer. I work mainly with Microsoft tools. Create strong, growing, and fast web applications using 𝐂# and .𝐍𝐄𝐓, along with modern ways to build the front end, like 𝐀𝐧𝐠𝐮𝐥𝐚𝐫 and 𝐑𝐞𝐚𝐜𝐭. I know all parts of making an application, from how the data is stored and how it's shared, to making good-looking and easy-to-use interfaces. 𝐈 𝐡𝐚𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐰𝐢𝐭𝐡 𝐯𝐚𝐫𝐢𝐨𝐮𝐬 𝐟𝐢𝐞𝐥𝐝𝐬, 𝐢𝐧𝐜𝐥𝐮𝐝𝐢𝐧𝐠: 🛒 𝐄-𝐜𝐨𝐦𝐦𝐞𝐫𝐜𝐞: I have made and improved online shops. This includes connecting payment systems (like Stripe, PayPal), making shopping carts work, and managing what is in stock. I have made these shops work better, so more people buy things. (Example: Increased average order value by 15% through personalized product recommendations.) 💳 𝐅𝐢𝐧𝐭𝐞𝐜𝐡: I have built safe money applications, like online banks, payment systems, and ways to see financial data. I made sure these followed the rules and were very secure. 🏥 𝐇𝐞𝐚𝐥𝐭𝐡𝐜𝐚𝐫𝐞: I have created applications that follow health rules for managing patients, booking appointments, and keeping health records. I focused on making these easy to use and keeping the data safe. 🚚 𝐋𝐨𝐠𝐢𝐬𝐭𝐢𝐜𝐬: I have designed applications for planning the best routes, tracking where things are, and managing how goods are moved. This has made deliveries much more efficient. (Example: Reduced delivery times by 20% with optimized routing algorithms.) In addition, I have built and looked after many 𝐒𝐚𝐚𝐒 applications using .NET. 🛠️ 𝐓𝐡𝐚𝐭’𝐬 𝐰𝐡𝐚𝐭 𝐈’𝐦 𝐬𝐤𝐢𝐥𝐥𝐞𝐝 𝐢𝐧: 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: C#, .NET Framework, .NET Core, ASP.NET (MVC, Web API), Entity Framework, SQL Server, RESTful API design and development, Web API, gRPC, Dependency Injection, LINQ, ORM 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: JavaScript, TypeScript, Angular, React, HTML5, CSS3, State Management (Redux, NgRx), UI/UX Design, Responsive Design, SPA 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: SQL, NoSQL, Database Design, Stored Procedures, Optimization 𝐂𝐥𝐨𝐮𝐝: Azure, AWS, Docker, Kubernetes 𝐎𝐭𝐡𝐞𝐫: Git, Agile, CI/CD, Unit Testing, Microservices Architecture, WebSocket 𝐋𝐞𝐭'𝐬 𝐭𝐚𝐥𝐤 about what you need and how my skills can help you succeed. Please contact me to discuss your project! 𝐁𝐞𝐬𝐭 𝐰𝐢𝐬𝐡𝐞𝐬, 𝐎𝐫𝐞𝐬𝐭 Below are mentioned keywords so you could find me easier :) .NET Core, .NET Framework, .NET Web API, .NET to Laravel migration projects, AI App Development, AI design tools, API, API Development, API Integration, API microservices, ASP.NET, ASP.NET 4.8 Web Forms, ASP.NET Core, ASP.NET MVC, ASP.NET Web API, Angular, Angular 15+, AngularJS, Auth0, Blazor, Bootstrap, Bruno, C#, C++, CSS, CSS3, Database Design, Database Development, Database Optimization, Desktop Application, Docker, Domain-Driven Design, Entity Framework, Excellent communication and collaboration abilities, Figma, Sketch, or similar, Front-End Development, Full-Stack Development, GDPR, Google Calendar API, GraphQL, HTML, HTML5, JSON, Java, JavaScript, Microservice, Microsoft Azure, Microsoft IIS, Microsoft SQL Server, Microsoft SQL Server Programming, Microsoft Visual Studio, MongoDB, MySQL, Network programming, Node.js, Nuxt.js, PHP, PostgreSQL, Proven track record of large-scale platform redesign projects, Python, QWBC, QuickBooks Enterprise, RESTful API, React, React Native, Responsive Design, Salesforce App Development, Salesforce Lightning, SEO optimization, Software Architecture & Design, SQL, Strong analytical and problem-solving skills, Telerik, TypeScript, UX & UI, User Interface Design, VB.NET, Web Application, Web Design, Web Development, Web development principles, Windows App Development, XML, Adobe Photoshop, Amazon EC2, Amazon Web Services, Azure DevOps, jQuery, backend.

⚙️ Building Scalable Digital Products with React, Node.js & Python ⚙️ 📅 6+ years of experience 📦 40+ completed projects 💰 $9M+ generated for clients 🌍 Platforms with 80,000+ active users I’m a Full Stack Developer and Full Stack React Developer with 6+ years of experience building scalable web applications. As a React Developer, React.js Developer, and Next.js Developer, I deliver modern frontend systems combined with powerful backend architectures. My backend expertise spans Node.js, Python, Django, and FastAPI, allowing me to build both high-performance APIs and enterprise-grade systems. I work as a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer, depending on project requirements. As a Full Stack Developer, I frequently combine React.js, Node.js, Python, Django, and FastAPI to deliver complete end-to-end solutions. 🚀 Full Stack React, Node.js & Python Engineering I work as a Full Stack Developer, Full Stack React Developer, and React Node.js Developer, building scalable applications with React.js, Next.js (Nextjs), and robust backend systems powered by Node.js, Python, Django, and FastAPI. I use Node.js daily for backend services, APIs, and real-time systems. As a Node.js Developer, I build scalable microservices and backend logic that integrate seamlessly with frontend applications. Alongside Node.js, I use Python, Django, and FastAPI for more complex backend architectures. Django is ideal for structured systems, while FastAPI is perfect for high-performance asynchronous APIs. My experience includes combining Node.js, Python, Django, and FastAPI in production environments where performance and scalability are critical. As a Full Stack Developer and Node.js Developer, I focus on: ⚙️ Improving performance (LCP/TTI) by 2–3x 📊 Increasing conversions by 25–35% 🚀 Scaling apps to 100K+ users 🧠 Backend Development with Node.js, Python, Django & FastAPI As a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer, I build APIs, backend systems, and scalable services. I use Node.js for real-time systems, event-driven architectures, and high-performance APIs. I also use Python, Django, and FastAPI to build structured backend platforms and high-speed microservices. In multiple projects, I combined Node.js with Python, Django, and FastAPI to create hybrid backend ecosystems. 🗄 Databases & Backend Architecture As a Full Stack Developer and Node.js Developer, I work with SQL, PostgreSQL, MySQL, and MongoDB to design scalable systems. I frequently integrate Node.js with PostgreSQL and MongoDB, and also use Python, Django, and FastAPI with relational databases for enterprise applications. I also use Supabase (PostgreSQL-based backend) alongside Node.js, Python, Django, and FastAPI. 🧠 Built systems using Node.js, Python, Django, and FastAPI 🔄 Designed APIs with Node.js and FastAPI 💸 Reduced backend costs with optimized Node.js services 🚀 Improved system performance using Node.js and Python 🎨 Frontend React & Next.js With 6+ years as a React Developer, React.js Developer, and Frontend React Developer, I build fast UI systems using React.js and Next.js (Nextjs). As a Full Stack Developer, I connect frontend applications with backend systems powered by Node.js, Python, Django, and FastAPI. 📱 React Native & Cross-Platform Apps As a React Native Developer, alongside my work as a Full Stack Developer and Node.js Developer, I build mobile applications connected to backend systems powered by Node.js, Python, Django, and FastAPI. 📱 10+ apps delivered 👥 100K+ users supported 💳 SaaS, Payments & Scalable Platforms Most backend logic in these systems is built with Node.js, while complex services often use Python, Django, and FastAPI. ⚙️ Additional Expertise 40+ projects as a Full Stack Developer and Full Stack React Developer Strong experience as a Node.js Developer, Python Developer, Django Developer, and FastAPI Developer Deep expertise in Node.js, Python, Django, and FastAPI backend systems Strong frontend skills with React.js and Next.js Experience with MongoDB, SQL, PostgreSQL, and MySQL Experience with Supabase and real-time systems AI integrations (OpenAI, ChatGPT) using Node.js and Python Built dashboards, PWAs, and SaaS platforms using Node.js, Django, and FastAPI 🤝 Why Work With Me Strong Full Stack Developer with deep backend expertise in Node.js, Python, Django, and FastAPI Experienced React Developer and Full Stack React Developer Skilled in building scalable backend systems using Node.js and Python Strong architecture thinking across frontend and backend If you’re looking for a Full Stack Developer, Node.js Developer, Python Developer, Django Developer, or FastAPI Developer with strong experience in React.js and Next.js — let’s connect. 👉 Click "Invite" or "Hire" and tell me about your project.

💻 Your reliable front-end and full-stack partner. ⚡ Clean code, fast delivery, no unnecessary complexity. 🎯 React, Next.js — production-ready, not prototype-quality. ❤️ Client-focused, clear communication, on-time delivery. WHY SHOULD YOU HIRE ME 📌 8+ years and 60+ products as a Full Stack Developer specializing in React and Next.js for SaaS Platforms, MVPs, and Web Applications. $3.8M+ in client impact, $900K+ in direct revenue volume generated through my work as a React Developer and Next.js Developer. 📌 20,000+ active users across Web and Mobile Apps where my work as a Front End Developer lifted engagement by 18-27%. 10,000+ users in Healthcare Web Applications and HIPAA-compliant systems where my work as a Front End Developer cut admin friction by 40%. 📌 2,423 completed orders, 489 registered customers in an E-commerce Website and CRM Platform MVP built as a Full Stack Developer with React and Next.js. 90% faster order processing and 80% lower manager workload through workflow automation and Front End Developer improvements. 📌 1,666+ catalog items, 4-role access, 2.7x operational capacity in a B2B Marketplace built as a Full Stack Developer with React and Next.js. 5-8 weeks shorter MVP-to-launch timelines and 35% fewer bugs through clean architecture and code review. 📌 $900K+ in client revenue as a React and Next.js Developer, with 8 years of experience as a Web App Developer building production-grade React applications. 📌 $3.8M+ in client impact with end-to-end ownership as a Full Stack Developer. 18-27% engagement lift and stronger user trust as a Front End Developer. 30-40% faster development cycles and stronger retention across SaaS products as a React Developer. WHERE I DELIVER 📌 As a Front End Developer, 20+ systems built with React and Next.js covering UI development, dashboards, and responsive design across SaaS Platforms, Booking Platforms, and E-commerce Websites. 📌 As a React Developer, 15+ launches in Next.js environments, with 30-40% faster iteration through component-based architecture and design-to-code workflows. 📌 As a Full Stack Developer, 25+ end-to-end builds with React, Next.js, and Node.js backends, covering API development, data architecture, and secure, scalable systems from early-stage MVP to live SaaS platform. 📌 As a Front End Developer, improving conversion by 15-22% through UI polish, UX refinement, and responsive design across web and mobile. 📌 10+ deployed mobile apps in the App Store and Google Play as a React Native Developer, extending the same React codebase to mobile. 📌 12-19% better repeat usage through booking, notifications, and payment flows built with React and Next.js. 📌 As a Full Stack Developer, 6-18 month engagements through platform scaling, feature expansion, and long-term development partnerships built on React and Next.js. 📌 As a Full Stack Developer, 99%+ delivery consistency across distributed teams, with clear communication and predictable delivery timelines. INDUSTRY IMPACT 📌 Marketplace Platforms, B2B Marketplaces, Two-Sided Marketplaces: 50,000+ active listings, 20%+ better lead quality, and a 35% increase in conversion rates as a Full Stack Developer and React Developer handling $2M+ in monthly transaction volume. 📌 Healthcare Web Applications, Clinic Management SaaS, Telehealth: 10,000+ active users, 500+ daily appointments processed, and 15% fewer patient no-shows as a Front End Developer maintaining 99.9% system uptime. 📌 AI-Powered Platforms: 5+ products deployed with custom AI features, built as a React and Next.js Developer integrating AI chatbots, RAG systems, and OpenAI/Claude APIs into full-stack applications. 📌 Logistics Platforms, ERP, Internal Workflow Systems: up to 12 hours saved per order cycle and a 40% reduction in data entry errors across 5+ regional hubs as a Full Stack Developer. 📌 Research Platforms, LegalTech SaaS, Fintech and PropTech MVPs: 18% better adoption and 40% higher user retention over 6 months through structured, permission-based systems built as a Front End Developer. HOW I BUILD 📌 50+ products as a Front End Developer: React, Next.js, React Native, JavaScript, TypeScript, HTML5, CSS3, Tailwind CSS, and responsive design. 📌 25+ SaaS platforms as a Full Stack Developer: Node.js backends, PostgreSQL, MySQL, MongoDB, Firebase, and Stripe integrations across payments, maps, and third-party APIs. 📌 10+ projects across WordPress, Shopify, PHP, Flask, and MERN stack as a Full Stack Developer, adapting React and Next.js to different environments as needed. 📌 40+ products built with strong Git practices, clean software architecture, and an engineer's mindset as a React and Next.js Developer.

⭐100% Delivery Rate and an expert-vetted agency with 25,000+ hours. 🔥 "Working with Vigen was a pleasure. It was a 𝐫𝐞𝐥𝐢𝐞𝐟 𝐭𝐨 𝐡𝐚𝐯𝐞 𝐬𝐮𝐜𝐡 𝐚 𝐬𝐦𝐨𝐨𝐭𝐡 𝐞𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 after working with others from Upwork. I highly recommend working with them for any software development needs. 𝐃𝐨 𝐲𝐨𝐮 𝐡𝐚𝐯𝐞 𝐩𝐞𝐚𝐜𝐞 𝐨𝐟 𝐦𝐢𝐧𝐝 𝐰𝐨𝐫𝐤𝐢𝐧𝐠 𝐰𝐢𝐭𝐡 𝐲𝐨𝐮𝐫 𝐝𝐞𝐯𝐬? Finding a reliable dev is tricky. I've not only worked as a senior web developer but have also managed dev throughout my career, giving me an understanding of the client's perspective. I've partnered with clients long-term, not only supporting website maintenance and improvements but also planning major projects together. As a dev, I make sure: ✔️ You won’t need to worry about code quality - external audits will show best practices. ✔️No need for double-checking QA. ✔️You can count on me as a partner for advice on any tech-related aspects. With 10 years of experience in Full Stack Development, CMS Development, and Web Design, I specialize in Laravel, PHP, WordPress, React, Vue, Next.js, and SaaS platform development. My Expertise: 🟩 WordPress Development – Custom WordPress themes, plugin development, WooCommerce stores, and Headless WordPress. 🟩 Laravel Full Stack Development – Building modern Laravel sites, SaaS platforms, and PHP applications. 🟩 API Platform & API Integration – Developing and integrating REST API, GraphQL, and third-party APIs. 🟩 Software & Platform Development – Creating scalable B2B, B2C, AI-driven, and enterprise applications. 🟩 Back-end Development – Expert in LAMP architecture, database management, and server-side logic. 🟩 Performance Optimization – WordPress & Laravel Core Web Vitals optimization, website speed, and performance enhancements. Technologies I Work With: 🟩 Back-End: PHP, Laravel, October CMS, API Development 🟩 Front-End: React.js, Vue.js, Next.js, Nuxt.js, JavaScript, jQuery, Bootstrap 🟩 CMS & E-Commerce: WordPress, WooCommerce, Elementor, ACF, Divi, BricksBuilder, BuddyPress 🟩 Database & Server Management: MySQL, PostgreSQL, Docker, Cloud Hosting 🟩 Version Control & DevOps: GitHub, GitLab 🟩 UI/UX & Design: Figma, Sketch, Adobe XD Services I Offer: ✅ Custom WordPress & Laravel Development ✅ SaaS Project Development & Platform Development ✅ WordPress Optimization, Core Web Vitals, and Performance Tuning ✅ Laravel Website, API Platform, API Integration ✅ WooCommerce Development & Custom E-Commerce Solutions ✅ PHP Web Application Development & PHP Script Customization ✅ Website Redesign, Maintenance, and Support Whether you need a Senior Laravel Developer for a SaaS project, a PHP Developer for a custom PHP website, or a WordPress Developer for a high-performance WooCommerce store, feel free to write me here on Upwork.

Senior Node.js Developer. Over 10 years building production Node.js, NestJS, and TypeScript backends end-to-end. Full-stack ownership across React, Angular, and the messy migrations between them. EdTech / healthcare: Ionic + web for education; HIPAA-oriented SaaS backend work. Mobile scale: backend optimization for a fitness product with 10M+ downloads and heavy transaction load. Angular: long-term products, migrations, enterprise UI, maintainable modules. Strong proof on large Angular codebases when that is the job. AI integration where it earns its keep: OpenAI / Gemini for document automation and workflow APIs. What I deliver: - Production Node.js + NestJS backends, TypeScript end-to-end - Express services, microservices architecture, REST and GraphQL APIs - Backend optimization at mobile-app scale (10M+ downloads case) - Angular front-ends and migrations when the project needs full-stack ownership - AI integration where it serves the product Tech stack: Node.js, NestJS, TypeScript, Express, Angular, React, MongoDB, PostgreSQL, REST/GraphQL, Firebase, Git. Senior Node.js Developer, Node.js Developer, NestJS Developer, Backend Developer, TypeScript Developer, Angular Developer, Full Stack Developer, Microservices Developer, Backend Architect.