Hire the Best JavaScript Developers
in the Czech Republic

Your application is slow. Deployments got nerve-wracking. New features take three times longer than they used to, and someone keeps telling you the whole thing needs a rewrite. It usually doesn't. I'm a software architect with 10+ years in JS, PHP, AWS, and large systems, and 5+ years leading engineering teams across Prague and US time zones. My work is fixing the systems other people are afraid to touch: slow applications, fragile legacy code, and the technical debt that quietly taxes every release. A few results from past projects: • Made a crawling application run 4x faster • Cut production downtime by 30% • Reduced technical debt 20% by introducing DDD and clear coding standards • Refactored ~30% of a system's critical legacy components, so the team could ship without fear of breaking things I work mostly with regulated, data-heavy businesses in fintech, insurance, and regtech, where mistakes are expensive and "rewrite everything" isn't a real option. My day-to-day is in healthcare-grade compliance systems, so auditability and data governance are normal constraints for me, not surprises. I also use AI tools (Claude, Copilot, Cursor) the way a senior engineer should: to move faster on analysis and refactoring while keeping output tested and consistent with your standards. Where it fits, I build retrieval (RAG) systems over your own data, with the accuracy and traceability regulated work demands. Where I can help: • Architecture reviews and system design • Performance optimization (PHP, Symfony, Laravel, MySQL, AWS) • Legacy modernization and migration without a full rewrite • Cloud infrastructure and DevOps (AWS: Lambda, ECS, Aurora, DMS, EventBridge) • RAG and AI integration over private data • Code review, engineering standards, team mentoring Stack: PHP, Symfony, Laravel, JavaScript/Vue, MySQL, AWS, Docker, Redis, Python, Rust, vector databases. If something in your system is too important to break and too slow or fragile to live with, send me a short note on what's going wrong. I'll tell you honestly whether it needs real modernization or just a few targeted fixes, before you commit to anything.

JavaScript Fullstack Developer - React, React Native, Flutter, Angular, Ionic, Node.js Hi! My name is Maryna and I am a professional javascript developer with 9+ years track record. And I lead the team of JavaScript ninjas - Codemotion, the Best Upwork Agency in Kyiv, Ukraine in Web&Mobile Development from 2018 🏆 We don’t just code - we solve your business needs. Effectively and on time. Launch your project on schedule! We are a team of Ninja Developers focused on JavaScript. We deliver complex web and mobile applications development using React, React Native, Flutter,Angular.js, Ionic, Vue.js, TypeScript, Node.js Services • CTO as a Service • End-To-End product development for Startups • AIAD - AI assisted development as a structured, senior-controlled delivery system • Team extension Why us • Ninja style - the mission will be accomplished, you can just enjoy the delivery and the demos • Care about relationships. “Clients for life” and “same boat” approach • Close collaboration - the more you're involved the better the result is • Deliver 101% result with Agile • Great at remote work with various time zones • Our developers are fluent in English and learn skills extremely fast Company Profile • Providing development services starting from 2016 • Headquarters and R&D in East Europe, the sales office in the USA • 120+ team members (Senior 30%, Middle 55%, Junior 15%) and keep on growing • We take care of the team – awarded "Best IT employer in Ukraine" by the most trusted Ukrainian IT resource DOU.ua Need a fast and effective MVP launch? Need a consultancy for your startup? Codemotion to the rescue! We cover: • React (ReactJS, React.js) • React Native (ReactNative) • Flutter • Node.js (Node, NodeJS) • Angular (AngularJS, Angular.js) • Vue.js (Vue, VueJS) • TypeScript (Type Script) • Meteor (MeteorJS, Meteor.js) • Ionic

I build full-stack products that grow with your business – from backend APIs to clean UIs and scalable AWS infrastructure. You get one senior engineer handling it all, so there are no handoff delays or coordination issues. I'm AWS Certified Developer and specialize in serverless systems, cost-effective cloud architecture, and CRM/SaaS platforms. My clients typically launch 30–40% faster and save $5K–15K/month on infrastructure. I solve complex problems with clean, production-ready solutions. No fluff, no delays – just results that scale.

✔️ Skilled professional with an academic background in IT ✔️ Proven commercial coding experience as a software developer since 2014 ✔️ Extensive knowledge of the whole software development life cycle Over the last 10+ years, my team and I have been building AI-powered products, backend systems, SaaS platforms, and automation tools designed around one simple goal - solving real business problems, not just shipping code. We’ve worked both as founders building our own products and as a technical partner helping startups and businesses launch, scale, automate operations, and turn ideas into production-ready systems. I work as a Senior Backend Engineer / Python Developer / AI Engineer backed by a full-cycle engineering team covering backend architecture, AI systems, integrations, infrastructure, and product development. With 10+ years in Python and AI systems, I’ve helped products reach 5M+ users and reduce manual operations by up to 80% for SaaS startups and growing businesses. I build production-ready APIs, automation, and AI platforms that turn ideas into reliable systems. 🤖 HOW I CAN HELP YOU AI SAAS DEVELOPMENT Turn your product idea into a scalable AI SaaS platform that can launch faster and support growth without constant rebuilds. I’ve helped deliver MVPs to production in about 6–10 weeks, with systems that have reached $700K MRR and 5M+ users. AI AUTOMATION SYSTEMS Reduce manual work and accelerate operations with workflows that handle repetitive tasks, routing, and decision-making automatically. My automation systems have cut operational workload by up to 80% and reduced manual operations by up to 70% in production. PYTHON BACKEND DEVELOPMENT Build a backend that stays stable under load, supports clean integrations, and gives your product room to scale. I work with FastAPI and Django on systems processing 100K+ real-time events daily, with architecture designed for concurrency, security, and long-term maintainability. API INTEGRATION DEVELOPMENT Connect your product to payments, CRMs, messaging tools, and third-party services so everything works as one system. I’ve built API-driven workflows with Stripe, Google Sheets, Microsoft Graph, Zapier, Make, and n8n to reduce friction and speed up operations. AI AGENT AND RAG DEVELOPMENT Add AI assistants that improve support, sales, and internal knowledge access without overwhelming your team. I build LLM, embeddings, and RAG-based systems that have processed 1.9M+ AI interactions in production and improved document and data processing speed by up to 10x. ⚙️ WHAT WE BUILD 🔹 Backend architecture, APIs, databases, AI layers, integrations, and deployment 🔹 SaaS products, AI automation platforms, and internal business systems 🔹 AI agents for operations, support, and sales 🔹 Document processing systems, OCR pipelines, RAG tools, and data extraction 🔹 Real-time systems, messaging platforms, dashboards, and reporting systems 🔹 Secure systems with authentication, roles, permissions, and audit logs 🔹 CRM integrations, Stripe subscriptions, webhooks, and workflow automation 📊 ADDITIONAL BUSINESS RESULTS 🔹 $800K+ generated by a SaaS platform within its first year 🔹 Backend systems supporting products generating $1M+ revenue 🔹 Up to 90% reduction in reporting errors after workflow automation 🔹 Rescue and rebuild of unstable systems into scalable production platforms 🎖 Python Developer 🎖 AI Developer 🎖 Machine Learning Engineer 𝗛𝗼𝘄 𝗜 𝗪𝗼𝗿𝗸 I build backend systems in Python with FastAPI and Django, then connect them to PostgreSQL and REST APIs for stable, scalable delivery. I use OpenAI and LangChain to add practical AI workflows, and I deploy on AWS with Docker so environments stay reliable. I manage integrations, automation, and data pipelines through webhooks and Node.js, keeping releases clean and production-ready. I build FastAPI and Django backends, integrate AI automation, and ship SaaS platforms with PostgreSQL, REST APIs, and AWS for startups. 🤝 𝗚𝗘𝗧 𝗜𝗡 𝗧𝗢𝗨𝗖𝗛 Have an AI, backend, or SaaS project ready? Message me on Upwork today for a free consultation and a clear plan to move forward.

🚀 15+ Years Full Stack Developer | Clients: NASA, Amazon, Google, MongoDB, Deloitte, Neom 💡 Full Stack Developer expert in Web, Mobile, Blockchain, Serverless, and Cloud (AWS, Azure, Google Cloud) solutions 📱 React | React Native | Flutter | Node.js | Python | TypeScript | K8S | DeFi | NFTs – versatile Full Stack Developer toolkit 🌐 Full Stack Developer ready for any scale – from small fixes or MVPs to complex enterprise apps ✅ Flexible engagement models: hourly, fixed-price, team scaling, full-cycle delivery – adaptable Full Stack Developer services 🙋‍♂️ Full Stack Developer able to build or scale teams whenever your project demands success With over 15 years of experience as a Full Stack Developer, I’ve launched and scaled high-performance web and mobile products across fintech, blockchain, aerospace, e-commerce, and healthcare. My extensive track record as a Full Stack Developer for global brands and ambitious startups guarantees cutting-edge, reliable solutions delivered efficiently. Recent Case Studies • Fintech Wallet “Trastra”: crypto and fiat wallet with 300 000+ users, crafted with Full Stack Developer precision. • Farm Management App “Herdwatch”: trusted by 50 000 agribusinesses, engineered through a Full Stack Developer approach. • Marketplace “Bidsheet”: wholesale electronics auctions serving hundreds of thousands, architected by a Full Stack Developer mindset. Technical Skills & Specializations As a Full Stack Developer I unite frontend and backend expertise for seamless products: • Frontend: React, React Native, Flutter, TypeScript, HTML5, CSS3 • Backend: Node.js (Express.js), Python (Django, Flask), GraphQL, RESTful APIs • Blockchain & Crypto: Ethereum, Solidity, Smart Contracts, DeFi, NFTs • Cloud & DevOps: AWS, Azure, Google Cloud, Serverless (Lambda, Functions), Docker, Kubernetes, CI/CD • Databases: MongoDB, PostgreSQL, MySQL, design & optimization • Security & Compliance: PCI DSS, secure coding, infrastructure audits • Architecture: Microservices, performance, scalability, reliability Collaboration Options • Short-term projects: prototypes, quick fixes, new features, audits • Long-term engagements: continuous product evolution • Full-cycle development: requirements to maintenance • Flexible pricing: hourly or fixed-price, whatever fits • Team scaling: rapid assembly of specialists led by a Full Stack Developer My Commitment I am a Full Stack Developer dedicated to clear communication, transparency, and tangible business outcomes. Expect high-quality, maintainable, secure code with user-centric design and robust functionality. Fluent in English, I collaborate smoothly with teams worldwide. Let’s connect and discuss how this Full Stack Developer can turn your vision into reality!

"Michal is an extremely proficient and professional front end web developer, delivering a project with a tight deadline on time in excellent quality." Do you need to stand out from the competition? I make AUTHENTIC and UNIQUE websites without the use of generic AI bloat. I have worked 100+ hours on Upwork to great customer satisfaction and I can bring your project to life. How I can help you: 💼 Build your company's website 🕹️ Create an interactive application (a game, a quiz, animations...) 🚀 Build a big Full stack web application 🎨 Turn your designs into a responsive website What I excel at: ⭐ Javascript ⭐ React ⭐ HTML & CSS ⭐ Flask ⭐ Figma ⭐ Svelte + Many more! I have experience working on both small and big projects. I have 6 years of web development experience & I've created many projects on my own. I have also worked in a medium sized company on projects containing tens of thousands of lines of code. I have studied Data Science in Maastricht, Netherlands and I am currently studying Computer Science in Brno, Czechia. Don't hesitate and let's bring YOUR project to life together! I'm looking forward to collaborating with you :)