Hire the Best Node.js Developers
in Poland

Hello! I'm a versatile Full-Stack and AI Developer with 8+ years of experience building scalable, high-performance web applications and intelligent digital solutions. I specialize in both front-end and back-end development, combining modern JavaScript frameworks with Python, cloud infrastructure, and AI technologies to deliver full-fledged products. My tech toolkit includes React.js, Vue.js, Angular, Node.js, Python, FastAPI, MongoDB, PostgreSQL, and a strong command of AWS services, including Lambda, Cognito, Amplify, Generative AI, LLM, Tensorflow, Langchain and more. I’ve also worked on GPT-powered features, integrating AI models to create smarter, more responsive applications. ✅ Services Offered: Front-End Development Responsive, user-centric UI design with React, Vue, and Angular State management using Redux, Vuex, etc. Seamless API integrations (REST & GraphQL) Performance optimization and accessibility best practices Back-End Development Robust API and microservice development using Node.js, Express, and FastAPI Python-based back-end logic for data processing, automation, and API services Secure authentication/authorization systems and custom middleware Database design and optimization (MongoDB, PostgreSQL) Web scraping (scraped sites like EBay for product information with images) AI & GPT Integrations Custom GPT-3.5/GPT-4 integrations for automation, chatbots, and smart UI features Prompt engineering and fine-tuned AI workflows Back-end support for AI features, including caching and input sanitization Data pipelines (from scratch and using individual components, not by using services like databricks or airflow) Machine learning models, their tuning and data analytics (using libraries like Tensorflow, langchain, crewAI, PowerBI) Cloud Services & DevOps AWS Cognito for secure user authentication and identity management AWS Lambda for serverless backend logic and API endpoints AWS Amplify for fast, scalable full-stack deployment and hosting Containerization with Docker and orchestration using Kubernetes CI/CD pipelines for efficient development and delivery Full-Stack Solutions Full end-to-end development with MERN, MEVN, or Python + React stacks Third-party API integrations and real-time features (WebSockets, Pub/Sub) Scalable infrastructure on AWS, including EC2, S3, CloudFront, and RDS 💼 Why Work With Me? Client-Focused: I align my work with your business needs and project goals Results-Oriented: Clean, maintainable, high-performance code every time Reliable Communication: Regular updates, collaborative approach, and full transparency On-Time Delivery: I respect deadlines and take ownership of getting the job done right Let’s turn your ideas into reality. Whether you're building an MVP, enhancing an existing system, or integrating AI-driven features, I’m here to help. Let’s connect and talk about how I can bring value to your next project!

Business software solution architect and developer specialising in Microsoft Power Platform (Power Automate, Power Apps, Dataverse) and Microsoft 365 Suite (SharePoint, Microsoft Lists, Outlook, Teams, Excel). I help companies build Microsoft 365 solutions to automate manual tasks, drive efficiency, and improve customer experience. ⚙️ What can I help you with Workflow Automation ↳ Automate repetitive tasks across MS365, Outlook, and other tools Business Apps ↳ Build custom applications that integrate seamlessly with MS365 Business Intelligence ↳ Visualise business data and track KPIs with dashboards and reports System Integrations ↳ Connect MS365 with external systems and third-party services Data Pipelines ↳ Extract data from multiple sources, unify and synchronise across systems ⸻ 🧰 My technology stack and tools ↳ Microsoft 365: SharePoint, Microsoft Lists, Excel, Outlook, OneDrive ↳ Microsoft Power Platform: Power Automate, Power Apps, Power BI, Dataverse, AI Builder ↳ Azure Cloud Platform: Azure Functions, MS SQL Server, Azure Data Factory ↳ Custom Code: TypeScript, JavaScript, .NET, Node.js, React While I value proficiency with specific tools, I strongly believe that the ability to deliver software solutions is largely technology-agnostic. I'm a proponent of choosing the best tool for each job and adapting quickly to new technologies when your project requires it. ⸻ ⏰ Project management Technical skills matter, but from my experience, I learned that successful software delivery depends equally on project management. So here are the steps I take to ensure your project is delivered on time, on budget, and in line with your expectations: ↳ Define a clear problem statement and scope ↳ Establish realistic timelines and budgets ↳ Design a solution that fits the budget ↳ Identify risks and dependencies upfront ↳ Provide regular progress updates throughout ⸻ ⚖️ Why work with me Here are a few things I think you'll find valuable from my diverse experience and the way I work: ↳ Business analysis skills. You don't need polished specs to get started. ↳ Technical proficiency. No problem is too technical for me to solve. ↳ Maintainable solutions. You get solutions that are cost-effective and fast to evolve. ↳ Pragmatic engineering. Custom code as a strategic solution, not the first option. ↳ Reliable delivery. Delivering your project is my job, not a side gig. ⸻ 📩 Get Started Looking for help with business software? Send me a message sharing what you're looking to achieve, and I'll get back to you within 24 hours with my thoughts on the best approach. Looking forward to helping you achieve your goals.

Full-Stack Developer (5 years) — TypeScript • Node.js • React/Next.js • .NET (C#) I’m a full-stack developer with 5 years of commercial experience building web applications, APIs, and end-to-end product features. My primary stack is JavaScript/TypeScript with Node.js, React, and Next.js, and I also bring strong backend experience with C#, .NET, and ASP.NET Core—so I can work comfortably across the entire system. What I can help with Building and scaling React/Next.js apps (SSR/SSG, routing, auth, dashboards) Designing and implementing REST APIs (Node/Express/Nest or ASP.NET Core) Database work: schema design, migrations, query optimization Integrations: payment providers, third-party APIs, webhooks Performance & reliability: caching, background jobs, error handling, logging Quality: TypeScript-first code, tests, code reviews, clean architecture Fixing and modernizing existing codebases (refactors, upgrades, tech debt) Tech stack TypeScript, JavaScript, Node.js, React, Next.js, Express/NestJS, C#, .NET, ASP.NET Core, PostgreSQL/MySQL, MongoDB, Redis, Docker, Git, CI/CD (GitHub Actions/GitLab CI), Jest/RTL, Playwright/Cypress. How I work I start by clarifying goals and constraints, then deliver in small, reviewable increments with clear status updates. You’ll get maintainable code, predictable progress, and a smooth handoff with documentation. If you share your brief or repo, I’ll reply with a short plan—quick wins, timeline, and the best approach for your next release.

With over 15 years of experience as a senior software developer, I have honed my skills in Python, .NET, ASP.NET, C#, Node.js, and modern front-end frameworks such as React, Angular, and Vue. My extensive background in software development and engineering positions me perfectly to deliver high-quality, AI-enabled solutions for your project. Here's a brief overview of my expertise: 🔸C# Programming: Proficient in C# with extensive knowledge in object-oriented programming, design patterns, and software architecture. I have developed numerous applications and tools that leverage C# for maximum efficiency and performance. 🔸.NET & ASP.NET Development: I have a decade-long experience in building robust, scalable, and high-performance applications using the .NET framework. My expertise includes developing web applications, APIs, and enterprise solutions with ASP.NET Core. 🔸Python Development: Experienced in Python for backend development, automation, data processing, and AI/ML integrations. I leverage Python's rich ecosystem including FastAPI, Django, and Flask to build scalable and efficient solutions. 🔸JavaScript, TypeScript & Node.js: Skilled in server-side development with Node.js, creating fast and reliable back-end services with Koa, Express, Nest.js, and Hapi. Additionally, my JavaScript expertise spans both front-end and back-end development, ensuring seamless integration and performance. 🔸Front-end Frameworks: Experienced in building dynamic and responsive user interfaces using React, Angular, and Vue, along with HTML, CSS, LESS, SASS, Webpack, Next.js, Nuxt.js, and Gatsby. My work involves creating reusable components, managing state efficiently, and ensuring a smooth user experience across various devices and platforms. Why Choose Me: 🔸Proven Track Record: A history of delivering high-quality projects on time and within budget. 🔸Collaborative Approach: I thrive in team environments, effectively communicating and collaborating with cross-functional teams to achieve project goals. 🔸Continuous Learning: Committed to staying updated with the latest industry trends and technologies to provide innovative solutions. I am enthusiastic about the opportunity to help you achieve your goals with my technical expertise and dedication. I am confident that my skills and experience will be key to the success of your project. Reach out to secure a reliable development partner

Why work with me? 👑 100% Job Success on Upwork ⭐ Top-rated agency 🤝 Using Cursor AI to speed up development 👨‍💻 10+ years of commercial experience 💎 CEO leading 40+ product launches for startups and SMEs Mobile full-stack developer and React Native expert with over 10 years of experience in building and scaling mobile products. While I’ve worked across the entire stack - from backend to frontend to cloud infrastructure - my focus today is on mobile development, particularly using React Native (Expo), Supabase, and Node.js. My core tech stack: 💬 React Native (Expo 🛠️ Node.js / TypeScript / JavaScript ⚙️ React.js / Next.js 💡 Supabase / PostgreSQL / MongoDB

🏆 7 years as a full stack developer. 50+ React and Node.js products shipped. 1 startup taken to a $25M valuation with $7M raised - Bairro, where I was lead full stack developer and website developer on a React and Node.js platform now used by 50K+ people. That is the track record behind every React and Node.js build I take on. 🚀 30+ SaaS Platform and Web App launches as a Senior Full Stack Developer and Full Stack Engineer. I started as a web developer and website developer before becoming a full stack developer who owns React frontend and Node.js backend equally. My full stack developer react node approach means one Full Stack Web Developer instead of three contractors - 40% faster delivery. 👋 Hi! I am Oleksandr, a Full Stack Developer and website developer with 7 years in React and Node.js. As a react developer I build interfaces in React and react typescript; as a Node.js specialist I run APIs and real-time services. My Full Stack Developer work covers SaaS Web App, Marketplace App, MVP SaaS, and Platform Development. Whether you have a Developer Needed post for a SaaS Product or need a Full Stack SaaS Developer for a Management Platform - I deliver. 📱 20+ industries as a full stack developer. I work as a full stack developer ai specialist and AI Engineer shipping AI Agent features. I deliver full stack developer shopify work, full stack developer laravel builds, python full stack developer projects, and .net full stack developer solutions. As a mobile app developer and React Native specialist I ship Mobile App Development for iOS and Android, including 12+ Real Estate and Property Management platforms. 🌐 100+ website developer projects delivered. My website developer work spans react nextjs and node.js backend developer builds, word press website developer projects, wordpress developer and website design work, shopify website developer stores, hubspot website developer setups, and wix website developer requests. Every website developer project follows SEO best practices with React speed and Node.js power. ⚡ React is in 100% of my full stack developer projects. React powers the SaaS Dashboard, Marketplace App, and Management Platform products I ship. I pair React with Node.js as a full stack node.js react specialist so components talk to APIs cleanly in every full stack developer react workflow. I also use vue, angular, javascript, flutter node.js, and react native for Mobile App Development - but React with Node.js stays my Full Stack Developer core. 🔧 Node.js handles 5M+ monthly requests across my client systems. As a back end developer node.js is my default for REST APIs, GraphQL, and microservices in every Full Stack Developer project. My node.js react pattern carries heavy traffic for SaaS Platform and Web App clients. Node.js runs authentication, payments, real-time messaging, and AI Agent pipelines in every full stack developer engagement. 📲 15+ mobile products as a full stack mobile developer. I build Mobile App Development with React Native, react native mobile, and react native expo. A Full Stack Developer react node architecture spans web and mobile, so one Full Stack Developer owns the whole App Development lifecycle. My react native work covers SaaS Product, Marketplace App, and Real Estate platforms. 🔗 50+ integrations as a Full Stack Developer and web developer. React frontends connect to CMS, e-commerce, and CRM systems. Node.js services plug into Stripe, Twilio, and dozens of APIs. My website developer and Full Stack Developer builds ship SaaS Development results on time. ✅ 0 abandoned projects in 7 years. Every website developer and Full Stack Developer build follows clean architecture: React stays modular, Node.js stays documented, deployments run automatically. React and Node.js are the Full Stack Developer foundation I build on, and I benchmark every Web App and SaaS Platform before handoff. 🔑 Why this full stack developer? A website developer who only knows React ships half a product; a Node.js engineer who never touches the frontend ships the other half. A full stack developer closes that gap. React without Node.js is a demo. Node.js without React is an API nobody sees. A full stack developer ties both together, and a good website developer keeps the result usable. 📌 Hire a full stack developer who writes React like a frontend specialist and Node.js like a backend one - and a website developer who does not disappear at handoff. My React code is documented, my Node.js services are tested, and every full stack developer project I close is a product you can run. That is what 7 years in React and Node.js buys you. 💬 Send me your brief. If it needs React, Node.js, a website developer, or a full stack developer who can own the whole build - let's talk. Every React and Node.js estimate I give is one I stand behind as your full stack developer.