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I’m Dmytro, a Senior Full Stack developer with 8+ years of experience building web and mobile applications for startups, product companies, and growing businesses. As a Full Stack developer, I work across both frontend and backend development, helping clients build products from scratch, improve existing systems, and support long-term growth. My main stack includes React, Next.js, Node.js, TypeScript, JavaScript, React Native, Python, PHP, and Angular. As a Full Stack developer, I build responsive user interfaces, develop backend services, create APIs, connect databases, and deliver features that support real business needs. I also work with Tailwind CSS, Material UI, MUI, SCSS, CSS, Webpack, Vite, Gulp, and modern development workflows. My skills: React Front-End Development Web Development Web Design Vue.js Laravel Mobile App Development Responsive Design API API Integration Web Application Database Architecture HTML Database Design Python Django AWS Development Project Analysis Web Application Development Software Architecture & Design As a Full Stack developer, I work with MongoDB, PostgreSQL, MySQL, Supabase, Firebase / Firestore, and DynamoDB. I can design and improve data structures, build scalable backend systems, and choose the right approach for each product. A Full Stack developer should understand how all parts of a system work together, and that is the approach I bring to every project. Our teams also work as web developer and react developer specialists building high performance user interfaces and SaaS dashboards. Some companies hire us as wordpress developer experts for custom plugin development and integrations. When projects require cross platform products our engineers also work as mobile app developer teams delivering mobile applications connected to backend SaaS systems. Clients hire me as a Full Stack developer when they need someone who can handle both frontend and backend tasks without losing sight of the product itself. I can join a team as a Full Stack developer, take ownership of a feature as a Full Stack developer, support scaling efforts as a Full Stack developer, or help stabilize an existing project as a Full Stack developer. I can also work as a Full Stack developer on MVP builds, refactoring tasks, feature expansion, bug fixing, and long-term maintenance. My services as a Full Stack developer include: React.js development, Next.js development, Node.js backend development, TypeScript applications, React Native mobile apps, API integration, database design, SSR, PWA, component libraries, design system implementation, HTML/CSS fixes, performance optimization, and ongoing product support. I also have strong experience as a Full Stack developer with SSR and PWA development, helping applications load faster, perform better, and provide a smoother user experience. I build SEO-friendly Next.js applications, mobile solutions with React Native, and modern web products that work well across devices and screen sizes. Beyond coding, I can contribute as a Full Stack developer who understands team processes and product delivery. I have experience with code reviews, Git workflows, CI/CD pipelines, architecture planning, and development team support. In some projects, I work only as a Full Stack developer. In others, I also help with technical leadership, project planning, and improving development workflows. A good Full Stack developer should be able to move between frontend and backend work, understand the business goal, and keep the codebase stable as the product grows. That is how I work as a Full Stack developer on every project. Clients choose me as a Full Stack developer because I can cover a wide technology stack, communicate clearly, and deliver work that fits both technical and business needs. If you need a Full Stack developer who can build, improve, and support modern digital products, I’m ready to help. I work as a Full Stack developer with attention to detail, clear communication, and a practical approach to problem-solving. Whether you need a Full Stack developer for a new product, a Full Stack developer for ongoing development, or a Full Stack developer to strengthen your current team, I can provide reliable support and solid technical execution. Best regards, Dmytro

🚀 Experienced Ruby on Rails developer 🚀 | 🏎️💛 Yellow Miata driver 💛 If you’re looking for a Ruby on Rails developer who understands SaaS products, a full stack developer Saas who sees the entire system, or a react developer who values real user experience — let’s talk. I’m a Ruby on Rails developer with strong product thinking who helps startups and growing companies build reliable, scalable, and maintainable platforms for long-term success. My background includes building modern web app platforms and scalable web application systems with custom web design, software architecture and design, and scalable API integration practices. As a Ruby on Rails developer, I work closely with founders, CTOs, and product teams to turn business requirements into stable, production-ready solutions. I have extensive experience as an AI Saas developer, focusing not only on backend implementation but also on growth, retention, and monetization. As a web app developer, I design systems around real workflows, combining strong web app design and performance using JavaScript, CSS, HTML5, Bootstrap, and TypeScript. 🧠 Deep product-focused experience With over 8 years of experience, I’ve worked on everything from MVPs to high-traffic systems. I’ve contributed to multiple products as a SaaS developer, including chatbot Saas solutions and platforms powered by ruby on rails openai. My work often involves building scalable web application development systems with strong architecture, RESTAPI, API development, and Database architecture. I’ve also worked on frontend integrations as part of Ruby on Rails React stacks, ensuring smooth UX and consistent web design across products. As a full stack ai saas developer, I bridge frontend, backend, and infrastructure to deliver complete solutions, including saas mobile app integrations where needed using React Native, Next.js, Vue.js, Angular, and Node.js. ⚙️ What I do Ruby on Rails application development from MVP to scale SaaS platform architecture and system design Custom backend logic and API development (REST & GraphQL) Background jobs, queues, and async processing Cloud deployments, CI/CD pipelines, and automation Third-party integrations and advanced workflows Beyond traditional SaaS platforms, I’ve worked on ecommerce systems and custom solutions as a web developer, including Shopify integrations. I’ve also built AI-powered features as part of AI Saas platforms, acting as a full stack saas developer ai agents to deliver intelligent automation, AI Agent Development, Large Language Model integrations, Retrieval Augmented Generation, Vector Database, machine learning, and LLM Prompt Engineering. I also collaborate with teams as a saas designer, contributing to product structure and usability, and can support product presentation through saas demo video creation when needed. ✅ What you get working with me Clean, well-structured code and scalable architecture. As a SaaS developer, I focus on long-term product success. As a web application developer, I deliver solutions aligned with real business needs and support developing and maintaining the application and optimizing performance within an existing Ruby on Rails project. 🔹 Proven real-world impact I helped scale a startup product to nearly 1,000,000 users, shaping my approach to performance and reliability. I’ve also worked on systems requiring high data integrity and integrations across multiple services using PostgreSQL, Redis, MySQL, SQL, Firebase, Heroku, Amazon web services, and DevOps practices. 🛠 Technologies & tools Ruby on Rails, Sidekiq, ActiveJob RESTful & GraphQL APIs PostgreSQL, Redis, Elasticsearch AWS, Heroku, DigitalOcean Stripe, Braintree, Apple Pay, Google Pay Git • Jira • API • Automation • RoR • Shopify • WordPress • PHP • Python • jQuery • Vue.js • Next.js • Artificial intelligence • software QA • Full Stack Payment Rails Development Experienced as a Rails + React Developer, Ruby on Rails architect, Senior Ruby on Rails Developer, senior Rails Developer, Ruby on Rails engineer, Full-stack web developer, and senior full-stack Ruby on Rails engineer with a strong background in Ruby on Rails. 🤝 Let’s build something solid If you’re looking for a Ruby on Rails developer who understands SaaS products, a full stack developer who sees the entire system, or a react developer who values real user experience — let’s talk.

🟢 Anyone can generate code with AI. But building real production systems that are stable, scalable, and used by real users is a completely different level. 🟢 I help startups and businesses turn ideas into real SaaS platforms, MVPs, React JavaScript website projects, and full-stack web applications — not just visually complete, but architected for long-term growth and scalability. As a React Developer and JavaScript Developer with 6+ years of experience, I've delivered 50+ production-ready systems including SaaS platforms, startup MVPs, dashboards, React Native mobile apps, and web applications used by thousands of users. My approach as a senior JavaScript Developer isn't about quick prototypes — it's about engineering complete digital products that grow from MVP to enterprise-level. From a high-performance React JavaScript website to a complex React NextJS SaaS platform or a cross-platform React Native application — every product I build is designed to last. ⭐️⭐️⭐️⭐️⭐️ "The system was delivered as a fully production-ready product with clean architecture, excellent performance, and scalability in mind. It went far beyond a simple MVP." 🎯 Full-Stack SaaS & Product Engineering ✔️ SaaS Platforms & MVP Development I design and build complete SaaS products from scratch as a React Developer — architecture, frontend, backend, database, deployment. Each React NextJS system is built to scale as the business grows — engineered by an experienced JavaScript Developer. ✔️ Startup MVP Development Rapid but structured MVP delivery focused on validation and future scalability. Whether it's a React JavaScript website, a React NextJS platform, or a React Native mobile app — as a JavaScript Developer, I help founders turn ideas into working products ready for real users and investors. ✔️ Scalable Web Applications React JavaScript website systems designed to handle high load, complex workflows, and growing user bases. Clean architecture, performance optimization, and maintainable Full Stack JavaScript codebases built by a senior React Developer and JavaScript Developer. ✔️ Frontend Engineering (React & Next.js) Modern frontend using React, Next.js, TypeScript, and Tailwind CSS. As a React Developer, I build fast, responsive, SEO-optimized React JavaScript website interfaces and React NextJS apps with reusable component systems and scalable UI architecture. ✔️ React Native Mobile Development Cross-platform mobile apps with React Native — sharing logic between iOS, Android, and web. React Native lets startups ship a consistent product faster, with the same React Developer and Full Stack JavaScript skillset behind it. ✔️ Full Product Architecture End-to-end architectures including database design, API structure, React JavaScript website frontend logic, React Native mobile layer, and infrastructure setup — delivered end-to-end by a JavaScript Developer. 🛠 Technology Stack React · Next.js · React Native · TypeScript · JavaScript · Node.js · NestJS · Python · FastAPI · PostgreSQL · MongoDB · Redis · AWS · Docker · Vercel · CI/CD 🚀 Engineering Focus & Performance Across multiple React Developer projects, I've optimized systems to: Improve API response times by 40–70% Reduce React JavaScript website frontend bundle sizes by up to 50% Support 10K–50K+ active users per product across web and React Native Maintain 99.9% uptime for production SaaS platforms Scale React NextJS backend systems to hundreds of thousands of API requests monthly 🧩 What I Deliver ✔️ Complete SaaS platforms (MVP → production → scaling) ✔️ Full Stack JavaScript web applications and React NextJS projects ✔️ React Native cross-platform mobile apps ✔️ Full-stack dashboards and admin panels ✔️ Authentication, payments, subscriptions, and user management systems ✔️ Deployment-ready production systems 🚀 Why Clients Work With Me ✔️ 6+ years of full-stack React Developer and JavaScript Developer experience ✔️ 50+ production systems delivered end-to-end ✔️ Strong focus on architecture, not just UI or code ✔️ Clean, maintainable, and future-proof Full Stack JavaScript codebases If you're looking for a React Developer, JavaScript Developer, React Next.js Engineer, React Native Specialist, or a Full Stack JavaScript professional to build a fast and scalable web product, I can create modern applications focused on performance and real business results. 🚀 Let's turn your idea into a high-quality, scalable React, Next.js, or React Native product — built by a React Developer and JavaScript Developer with end-to-end Full Stack JavaScript expertise. 📅 Last update: 03.06.2026

I am a web developer with 10+ years of experience and a Master's degree in Software Engineering. I specialize in building custom web calculators, forms, and interactive web applications that help businesses generate leads, automate calculations, and improve user engagement. I have worked on a wide range of projects, from simple calculators to complex logic-based tools with API integrations, dynamic data processing, and CRM connections. What I can do for you: Build custom web calculators (finance, pricing, ROI, etc.) Create multi-step forms and quizzes with logic Integrate calculators with APIs, Google Sheets, or CRMs Embed solutions into any website Optimize performance and user experience Tech stack: JavaScript, jQuery PHP, MySQL HTML5, CSS3 AJAX WordPress, OpenCart Yii2 I focus on clean, reliable solutions and clear communication. Most of my projects are delivered as ready-to-use tools that can be easily integrated into your website.

Reliable .NET Full Stack Developer for Scalable Web Solutions I’m a .NET Full Stack Developer who delivers production-ready features on time, keeps development cost-efficient, and builds scalable web solutions that grow with your business. As a Senior .NET Full Stack Developer, I design and develop secure, high-performance applications using .NET and Angular, focusing on clean architecture, scalability, and long-term maintainability. I’m a .NET Developer who aligns technical decisions with business goals. Every solution I deliver as a .NET Full Stack Developer is production-ready, reliable, and built for real users. Experience & Credentials Certified Senior .NET Full Stack Developer 8+ years of commercial experience as a .NET Developer and Tech Lead 30+ completed projects on Upwork 100+ delivered projects with my Intelvision team (last 5 years) 100% Job Success | 1900+ hours | $100K+ earned Trusted .NET Developer for Visoplan, ING+, Jincom, Kiflo, and more When clients need a reliable .NET Full Stack Developer, they come back. Core Role: .NET Full Stack Developer As a .NET Full Stack Developer, I handle frontend, backend, APIs, databases, cloud infrastructure, and DevOps. As a .NET Developer, I ensure security, performance, and scalability from day one. I work as: .NET Full Stack Developer for SaaS platforms .NET Full Stack Developer for enterprise systems .NET Full Stack Developer for MVP and startup products .NET Developer for long-term system growth Core Technologies (.NET Full Stack) .NET Full Stack .NET Developer (ASP NET Core, Web API, SignalR) Angular (enterprise SPA, NgRx, RxJS) Node.js (for hybrid architectures when needed) Every project is led by a .NET Full Stack Developer, not a generalist. Backend & Architecture (.NET Developer Expertise) As a .NET Developer, I build backend systems using: RabbitMQ, Docker, Kubernetes, Redis, GraphQL, SignalR, Elasticsearch, Hangfire, MediatR, Quartz NET, Akka NET, Autofac, Dapper, NHibernate, Swagger, FluentValidation, Serilog, NLog This is what separates a .NET Full Stack Developer from a basic coder. Frontend Development (Angular) As a .NET Full Stack Developer, I pair backend power with modern UI development: Angular, TypeScript, SPA, PWA, NgRx, RxJS, Angular Universal, NG-ZORRO, Tailwind CSS, MUI, Ant Design, Lighthouse optimization A strong .NET Developer always delivers a strong frontend. Cloud, DevOps & CI/CD (.NET Full Stack) Azure, AWS, Docker, Kubernetes, GitHub Actions, GitLab CI, Azure DevOps A real .NET Full Stack Developer owns deployment, scaling, and monitoring. Security & Authentication (.NET Developer Focus) Auth0, IdentityServer4, Azure AD B2C, OAuth 2.0, JWT, Azure Key Vault, AWS IAM Security is mandatory for any .NET Full Stack Developer. Business & API Integrations Stripe, Xero, QuickBooks, Microsoft Graph API, Salesforce, SAP, Dynamics As a .NET Developer, I build systems that integrate with real business tools. Testing & Quality xUnit, NUnit, Moq, MSTest, Karma, Jest A professional .NET Full Stack Developer ships tested code. Industry Experience as .NET Full Stack Developer SaaS platforms FinTech systems PropTech and ConTech Logistics and supply chain Custom enterprise solutions Each domain was delivered by a .NET Full Stack Developer with real production experience. Why Clients Choose Me as a .NET Full Stack Developer Deep backend expertise as a .NET Developer Strong Angular frontend delivery Clean architecture and scalability Business-oriented mindset Long-term partnership approach Whether you need an MVP, SaaS, PoC, or enterprise system, you need a .NET Full Stack Developer, not just a coder. Let’s Build Your Product If you’re looking for a reliable .NET Full Stack Developer, an experienced .NET Developer, and a partner who delivers on time, let’s talk. Your product deserves a .NET Full Stack Developer who understands scale, security, and growth.

Senior Full Stack Developer and hands-on software architect with 10+ years building scalable SaaS platforms, AI-powered products, high-load systems and real-time web applications using React, Next.js, Node.js, TypeScript, PostgreSQL, AWS and modern cloud infrastructure. I help startups and scale-ups ship products that survive real traffic — shortening time-to-market, supporting rapid scaling and increasing system reliability. As a Full Stack Developer I own the whole stack — one engineer who speaks both front end and back end, no handoff chain. Clients hire me as a Full Stack Developer for startup MVP development, as a React Developer for complex Next.js interfaces, as a Node.js or Backend Developer for scalable SaaS architecture and microservice architecture, as a Python developer for AI-heavy back ends or as the Web Developer and tech lead owning architecture inside a larger team. What I deliver: - 🧩 Frontend React / React Developer — React.js, Next.js, JavaScript, TypeScript, HTML, CSS, Redux, TanStack Query, MUI, Shadcn, Tailwind CSS, Bootstrap: responsive, accessible interfaces tuned for improving conversion rates and Web Design execution. Deploys on Vercel and AWS. - ⚙️ Backend Nodejs / Backend Developer — Node.js, NestJS, Express, REST, GraphQL, WebSocket, gRPC, RabbitMQ: API Development, scalable APIs, event-driven architecture, CQRS, microservice architecture, fault-tolerant systems, horizontal scaling. - 🗄️ Data — PostgreSQL, MongoDB, MySQL, Redis, Prisma, TypeORM, Mongoose: clean data models tuned for high-load systems and multi-tenant SaaS. Comfortable on Supabase alongside my usual PostgreSQL setups and on Pinecone for vector search in AI workloads. - ☁️ Cloud & DevOps — AWS, Kubernetes, Docker, Terraform, Nginx, Prometheus, Grafana, Git, CI/CD: scalable infrastructure, monitoring, zero-downtime releases, reducing infrastructure costs and operational bottlenecks. - 🤖 AI — OpenAI and Anthropic Claude integrations, LLM pipelines, RAG, prompt engineering, MCP, AI agents, agentic systems, AI copilots, AI workflows, AI automation: shipping AI-powered products and AI Integration since the earliest OpenAI APIs. - 🔗 Web3 — Solidity, smart contracts, DeFi, EVM and Solana/TON chains, HD wallets, blockchain analytics, secure financial flows for fintech infrastructure. Industries: FinTech, SaaS, CRM, E-commerce, Marketplace, B2B platforms. Services: MVP Development, SaaS Development, AI Integration, API Development, Performance Optimization. Beyond the core build I handle third-party and payment integrations, API integration, admin dashboards, real-time features, performance audits and legacy modernization. Where a project calls for it I also work as a WordPress Developer or on Shopify and PHP/Laravel for content-heavy sites, e-commerce stores and CMS-to-custom migrations toward modern Node.js + React. I work as a Vue.js or Angular developer on existing front end codebases too. That modernization work often means migrating teams off Webflow or aging .NET back ends onto a modern Node and Next.js stack. When web, mobile or desktop need a single owner, I step in as a Mobile App Developer and Desktop Application engineer — React Native, PWA and Electron-based apps on the same Node.js back end. Testing, QA and observability are part of delivery, not an afterthought. Selected results as a Full Stack Developer and tech lead: - ⭐ Scaled a Node.js + React platform from 500K to 15M+ users; cut response times 1500%+ via re-architecture, caching, async processing — supporting rapid scaling. - ⭐ Built a SaaS lead-management platform (Node.js + Next.js) from MVP in 10 days to 1M+ leads/year at 99.9% uptime — shortening time-to-market and increasing system reliability. - ⭐ Designed a real-time blockchain analytics product on Node.js with React dashboards; wallet aggregation dropped from ~10 minutes to 5–40 seconds. - ⭐ Delivered a marketplace aggregator processing 1M+ items in near real time, with anti-fraud and double-entry financial controls. Stack: Node.js, TypeScript, React, Next.js, NestJS, PostgreSQL, MongoDB, Redis, RabbitMQ, AWS, Kubernetes, Docker, Golang, Python, PHP/Laravel. How I work: I treat Full-Stack Development as one accountable role — domain-driven design (DDD), Software Architecture & Design, Software Development, Web Development, Web Design execution, deployment and post-launch Performance Optimization. I'm equally comfortable as the solo engineer on a startup MVP or as a tech lead mentoring a team, improving developer velocity and aligning with product, design and business stakeholders. Clear communication, predictable delivery, commercial outcomes. If you need a Full Stack Developer, React Developer or senior Node.js developer who can lead architecture and ship across Next.js, Node.js, databases, cloud and AI — let's talk.