𝐄𝐱𝐩𝐞𝐫𝐭-𝐕𝐞𝐭𝐭𝐞𝐝: 𝐓𝐨𝐩 𝟏% 𝐨𝐧 𝐔𝐩𝐰𝐨𝐫𝐤 I have been in the IT industry for more than 12 years. Currently, I am the CEO of Wetelo, Inc., a successful software development company. 🚀 𝐖𝐞 𝐁𝐮𝐢𝐥𝐝. 𝐘𝐨𝐮 𝐒𝐜𝐚𝐥𝐞. We help our partners grow by delivering tailored, full-cycle solutions — from idea validation to launch and beyond. 🏅 𝐑𝐞𝐜𝐨𝐠𝐧𝐢𝐳𝐞𝐝 𝐄𝐱𝐜𝐞𝐥𝐥𝐞𝐧𝐜𝐞 * 𝟑𝟎+ 𝟓-𝐬𝐭𝐚𝐫 𝐂𝐥𝐮𝐭𝐜𝐡 𝐫𝐞𝐯𝐢𝐞𝐰𝐬 * 𝐏𝐫𝐨𝐯𝐞𝐧 𝐒𝐮𝐜𝐜𝐞𝐬𝐬: Launched over 30 projects in the past year 𝐃𝐢𝐯𝐞𝐫𝐬𝐞 𝐈𝐧𝐝𝐮𝐬𝐭𝐫𝐲 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 💹 FinTech 🔗 Web3 Solutions 🎥 Media and Entertainment 🏡 Real Estate 🌱 Sustainability 🩺 Healthcare 🏋️‍♂️ Fitness & Wellness 🚛 Logistics 🎮 IGaming 🌐 Internet of Things (IoT) 𝗣𝗿𝗼𝗱𝘂𝗰𝘁𝘀: 💱 Cryptocurrency Exchanges (CEX) and Decentralized Exchanges (DEX) 🔱 Decentralized Finance (DeFi) Platforms 💼 Investment Management Software 📊 Financial Data Analytics Tools 📱 Decentralized Applications (DApps) 📹 Video Streaming Platforms 🏢 Real Estate Management Software 🌿 Carbon Footprint Tracking Apps ♻️ Renewable Energy Marketplaces ⚡️Renewable Energy Trading Platform 🗑️ Waste Management Solutions 📈 Healthcare Platforms 🏃 Fitness Tracking Apps 🚚 Transportation Management Systems (TMS) 📦 Warehouse Management Software (WMS) and Inventory Management Systems 🎲 Sports Betting Websites 📈 Betting Exchange Platforms 📱 Telegram Mini Apps 🎮 TON Games 📲 IoT Device Management Solutions 🧑‍💻 𝐓𝐞𝐜𝐡 𝐰𝐞 𝐥𝐨𝐯𝐞: 🔸 JavaScript, TypeScript, Next.js, Node.js, Nest.js, React, Express.js, Redux. React Native, three.js, 🔸Rust, Solidity, Web3.js 🔸PHP, Yii, Symfony, Laravel 🔸HTML5, CSS3 🔸 MySQL, PostgreSQL, MongoDB, JSON, XML, RESTful API 🔸 Git, Jira, Slack, Linux, AWS. Experience our comprehensive product development and outsourcing/outstaffing services driven by cutting-edge technologies. 🌟 Discover why our clients rave about us with our 𝐫𝐞𝐯𝐢𝐞𝐰𝐬. 🚀 Dive deep into our 𝐬𝐮𝐜𝐜𝐞𝐬𝐬 𝐬𝐭𝐨𝐫𝐢𝐞𝐬 and 𝐩𝐨𝐫𝐭𝐟𝐨𝐥𝐢𝐨 to witness our impact firsthand. 🤝 𝐇𝐢𝐫𝐞 𝐮𝐬 today to unlock unparalleled innovation and growth for your business.

I build AI agents that run business operations – answering phone calls, qualifying leads, responding to customer questions, processing documents, pulling answers from internal data. 𝗔 𝗳𝗲𝘄 𝗲𝘅𝗮𝗺𝗽𝗹𝗲𝘀: 📞 A phone agent for law firms that answers intake calls 24/7, qualifies cases, scores them, and transfers callers to attorneys. Bilingual English/Spanish. Thousands of calls monthly. 💬 A chatbot inside a CRM that gives sales teams instant answers about meetings, deals, and contacts – no searching, no clicking through screens. 📋 A Q&A system for a compliance consultancy. Answers regulatory questions with citations to source documents. Every response verified before delivery. 📄 Cut financial advisor document prep from 6 hours to 2 minutes. Intake forms go in, 15-20 page client reports come out. 🧠 Turned a marketing agency's 100+ articles into an AI advisor their clients query on demand. 𝗪𝗵𝗮𝘁 𝗜 𝗯𝘂𝗶𝗹𝗱: 📞 Phone agents – inbound, outbound, transfers, multilingual 💬 Chatbots – customer support, internal tools, knowledge bases 📋 Q&A systems over documents, policies, regulations 📄 Document processing and automated report generation 🔗 AI wired into existing platforms and workflows 𝗖𝗼𝗺𝗽𝗮𝗻𝗶𝗲𝘀 𝗜 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵: - Coffee AI CRM – "Automate Your Sales Workflow. Meet your AI CRM Agent." - KlientBoost – "The Performance Marketing Agency That Hits Bigger & Bigger Goals" - Proximo AI – "Scale world-class career coaching for every job seeker" - Casegen AI – "AI Powered Intake & Receptionist, All on Autopilot" - Bullseye - "Turn Anonymous Visitors into Customers" - Eye4Fraud – "Guaranteed fraud protection for ecommerce merchants" - Vive Health – "Online Medical Equipment & Supplies" - ProperKey – "Business automation for letting agencies" - The Compliance Company (NZ) – "boutique Compliance Consultancy Firm" - AdTrail – "Slack Alerts for Google & Meta Accounts" 𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸: I figure out what the business actually needs before building anything. Sometimes the right answer is simpler than expected. Sometimes more involved. Either way – straightforward about what works and what doesn't.

📊My last Next.js web app improved performance by 65%. A Healthcare digital platform i revamped increased user engagement and reduced front-end load times by 35%. I’m a Senior TypeScript/Next.js engineer with 10 years experience. I've shipped fast, scalable, accessible web applications with TypeScript, Next.js and React . I’ve built 25+ full-stack applications, 50+ high-performance Landing Pages, and 5+ scalable SaaS platforms. I can act as a Front End Architect and Tech Lead. I design clean component architectures, robust state management, and reliable API integrations that scale. My work spans event/ticketing platforms, real-time crypto dashboards, secure enterprise admin panels, and full-stack SaaS (NestJS + GraphQL + PostgreSQL). I care about accessibility, performance optimization, and maintainability. 🚀 𝗞𝗲𝘆 𝗔𝗰𝗵𝗶𝗲𝘃𝗲𝗺𝗲𝗻𝘁𝘀 • Mentored 15+ junior developers into strong TypeScript & frontend engineers • Led 8 Web Development teams (Agile / Scrum / Kanban) delivering complex Web Applications on time • Built secure CRMs, SaaS platforms with advanced dashboards, and Mobile Applications (React Native for iOS & Android) • Reduced front-end load times ~40% via code splitting, lazy loading, performance optimization (Lighthouse) • Improved development velocity ~30% with modular design patterns, scalable architectures (Turborepo + Vite) • Increased SaaS user engagement ~25% through UI/UX improvements, responsive design, design-system consistency • Delivered landing pages with 95+ Lighthouse performance scores 🎯 𝗦𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗜 𝗼𝗳𝗳𝗲𝗿 - Front End development with TypeScript, Next.js, React, JavaScript (ES6+) - Design systems & component libraries: shadcn/ui, Radix UI, Tailwind CSS, styled-components, vanilla-extract, CSS Modules - API-driven applications: REST, GraphQL (Apollo Client), OpenAPI/Swagger, Axios; auth, RBAC, JWT, OAuth; form-heavy UIs (React Hook Form + Yup/Zod) - Dashboards & real-time experiences: WebSockets, data visualization (ECharts), streaming state, pagination & caching - Performance & refactoring: bundle splitting, lazy loading, route-level code splitting, Lighthouse audits, RUM - Architecture: monorepos (Turborepo), Vite (React SWC), Webpack, OpenAPI Generator, CI/CD (GitHub Actions) - QA & reliability: Playwright, unit tests, linting/formatting (ESLint, Prettier), conventional commits 🏆 𝗧𝗲𝗰𝗵 𝗦𝘁𝗮𝗰𝗸 - Front end: TypeScript, Next.js, React, JavaScript (ES6+), Redux, Redux Toolkit, Redux-Saga, React Context, Jotai, TanStack Query, TanStack Router - UI & Styling: Tailwind CSS, styled-components, CSS 3, HTML5, shadcn/ui, Radix UI, vanilla-extract, Responsive Design, Accessibility (react-aria-components), theming - Forms & Data: React Hook Form, Yup, Zod, Axios, ECharts, Data Visualization best practices - APIs & real-time: REST, OpenAPI/Swagger, GraphQL (Apollo), WebSockets - Back end & Database: Node.js, NestJS, Express, PostgreSQL, Prisma, MongoDB, MERN exposure - Tooling: Vite, Turborepo, Webpack, ESLint, Prettier, Docker, GitHub Actions, OpenAPI Generator, monorepo workflows - Testing: Playwright, unit/integration - Deployment & Observability: Vercel, Microsoft Application Insights, logging/monitoring hooks - Mobile: React Native (iOS/Android), Flutter 🛠️ 𝗪𝗵𝘆 𝘁𝗲𝗮𝗺𝘀 𝗵𝗶𝗿𝗲 𝗺𝗲 • Speed without debt: typed APIs, clean boundaries, maintainable state (Redux Toolkit/Jotai/TanStack Query) • Design-system mindset: focus/keyboard patterns, ARIA, theming, RTL, consistent tokens • Handover: docs, CI/CD, lint/format rules, sensible folder conventions, 💬 𝗘𝗻𝗴𝗮𝗴𝗲𝗺𝗲𝗻𝘁 𝗺𝗼𝗱𝗲𝗹𝘀 • Fixed-scope MVPs with clear milestones & demos • Part-time augmentation (frontend lead, feature owner) • Audits & refactors (TypeScript migration, state cleanup, performance hardening) 📩 Have a spec, API, or Figma? Share it and I’ll send a mini plan (architecture, milestones, first shippable increment) and a clear fixed price for the initial slice. 🔍 𝗞𝗲𝘆𝘄𝗼𝗿𝗱 𝗯𝗹𝗼𝗰𝗸 Front-End Development, Front-End Developer, Front-End Architect, Senior TypeScript Developer, Remote TypeScript Developer, TypeScript, Next.js Developer, Full Stack Developer, Web Developer, UI Developer, React Developer, Next.js, JavaScript Developer, React, Next.js, React Native, Vue.js, JavaScript, ES6, Redux, Redux Toolkit, Redux Saga, Zustand, Jotai, TanStack Query, TanStack Router, HTML5, CSS 3, SCSS, SASS, CSS Modules, Styled Components, Tailwind CSS, Material UI, shadcn/ui, Radix UI, vanilla-extract, UI, UX, UI/UX Design, Accessibility, ARIA, WCAG, Cross-Browser Compatibility, Framer Motion, Node.js, Express.js, NestJS, REST, REST API, API Integration, GraphQL, Apollo Client, WebSockets, MERN Stack, Full-Stack Development, PostgreSQL, SQL, MongoDB, Prisma, Firebase, Supabase, Authentication, Authorization, RBAC, JWT, OAuth, Security, Vite, Webpack, Turborepo, Nx, Monorepo, npm, Yarn, ESLint, Storybook, Chromatic, Jest

👋 Greetings! I’m a seasoned Mobile developer with over 1️⃣5️⃣ years of experience in iOS and Android Mobile App Development. I combine design, development, and technical leadership to deliver high-quality, scalable apps. 🎓 M.S. in Computer Programming, with expertise across multiple development stacks. ⭐️ Hundreds of 5-star reviews and 🎯 100% Job Success on Upwork and beyond! 🚀 About Me As a full-cycle Mobile App Developer, I take your project from an initial 💡 idea to a fully functional 📱 mobile application. I handle everything from UI/UX design to backend API integration, ensuring a seamless experience from start to finish. Whether it’s native iOS development with SwiftUI or Android development using Kotlin or Java, I’m dedicated to building high-performing apps. I am a reliable Mobile developer for startups, enterprises, and innovative projects alike, bringing technical insight and creative problem-solving to every stage of development. 👉 Contact Me Reach out today for a Mobile App Developer consultation, and let’s discuss how to bring your app vision to life! 🛠️ Technologies & Tools Native iOS Development: Swift, SwiftUI, Objective-C, Core Data, Core Animation, XCTest Native Android Development: Java, Kotlin, Jetpack Compose, Room Database, Retrofit, Dagger, Coroutines Cross-Platform Development: Flutter, React Native (Dart, JavaScript) Backend Integration: Firebase, REST APIs, GraphQL, Node.js, Python, AWS, Azure, Google Cloud Databases: MySQL, PostgreSQL, MongoDB, Redis, Cassandra, Firestore, SQLite CI/CD & DevOps: GitHub Actions, GitLab CI, Jenkins, CircleCI, Docker, Kubernetes Testing & Automation: TDD, BDD, Unit Testing, XCTest, Espresso, Appium, Selenium, JUnit API & Payment Integration: REST, GraphQL, OAuth, Third-Party SDKs, Stripe, PayPal, Apple Pay, Google Pay 💪 Areas of Expertise I specialize as a Mobile App Developer in creating scalable mobile apps with microservices architecture and event-driven design that can handle high traffic. My apps are optimized for performance across iOS and Android platforms, ensuring the best user experience. 📱 Featured Projects Food & Retail Delivery Platforms: Real-time tracking, push notifications, and in-app payments. Social Media Apps: Chat, feeds, profiles, authentication, real-time updates. E-commerce & Marketplace Apps: Secure payments, commission systems, inventory management. Productivity Apps: Task and expense management apps using Flutter and React Native. 🌟 I turn ideas into market-ready apps as a professional Mobile developer, combining creativity with technical precision. Whether you need a native iOS app or a cross-platform solution, I provide complete Mobile App Development services from concept to launch. Let’s collaborate to make your app the next hit on the Apple App Store and Google Play Store! ⚡️ Updated portfolio: May 6, 2026

⚙️ 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.

𝐇𝐞𝐲 𝐭𝐡𝐞𝐫𝐞! 👋 𝐈’𝐦 𝐀𝐥𝐞𝐱𝐞𝐲, a Senior Full Stack Web Developer specializing in MERN and .NET development for modern web platforms, SaaS products, and scalable business applications. As a Senior Full Stack Web Developer, I work across the entire development cycle building reliable frontend and backend systems using MERN stack technologies and .NET backend solutions. If you're looking for a Senior Full Stack Web Developer with strong experience in MERN and .NET, who can build scalable and production ready platforms, you're in the right place. I help companies turn product ideas into fully working platforms using MERN architecture and .NET backend services, delivering clean, maintainable code and stable long term solutions. 🔸 Clean and scalable architecture 🔸 Strong backend logic with .NET 🔸 Modern frontend development with MERN stack 🔸 Clear communication and reliable delivery 🚀 𝐂𝐨𝐫𝐞 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞 As a Senior Full Stack Web Developer, I build complex web platforms using MERN and .NET technologies, including: • SaaS platforms and business applications • Admin dashboards and management systems • Marketplaces and booking platforms • Real estate and property management systems • Subscription based web products • High performance web applications built with MERN and .NET My experience as a Senior Full Stack Web Developer working with MERN and .NET allows me to build systems that are stable, scalable, and ready for real production use. ⚙️ 𝐖𝐡𝐚𝐭 𝐈 𝐂𝐚𝐧 𝐁𝐮𝐢𝐥𝐝 𝐅𝐨𝐫 𝐘𝐨𝐮 As a Senior Full Stack Web Developer specializing in MERN and .NET, I can help build complete platforms including: ✅ Full stack web applications using MERN and .NET ✅ SaaS platforms with complex business logic ✅ Admin panels and dashboards ✅ REST APIs built with .NET backend architecture ✅ Scalable backend services using .NET ✅ Modern responsive frontend applications built with MERN stack technologies ✅ Marketplace and booking platforms ✅ Payment integrations and subscription systems 🧰 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤 Frontend:React | Next.js | JavaScript | TypeScript Backend: Node.js | Express.js | .NET ASP.NET Database: MongoDB | PostgreSQL | SQL Server Tools: Docker | Git | REST APIs | Cloud platforms 🌟 𝐖𝐡𝐲 𝐂𝐥𝐢𝐞𝐧𝐭𝐬 𝐖𝐨𝐫𝐤 𝐖𝐢𝐭𝐡 𝐌𝐞 Senior level development experience Strong expertise in MERN and .NET development Ability to handle both frontend and backend architecture Experience building scalable SaaS platforms Focus on clean, maintainable production code If you're looking for a Senior Full Stack Web Developer with strong expertise in MERN and .NET, feel free to reach out. 💬 Send me a message and let's discuss your project.

Hi, I'm Dmytro. I'm a Front End developer with more than 8 years of experience building web and mobile applications for startups, product companies, and growing businesses. As a Front End developer, I've worked on MVPs, SaaS platforms, e-commerce products, internal business tools, and customer-facing applications used by thousands of users. My primary focus as a Front End developer is creating fast, responsive, and user-friendly applications using modern JavaScript technologies. I enjoy transforming complex requirements into clean, maintainable solutions that provide real value to users and businesses. Throughout my career as a Front End developer, I've worked closely with designers, product managers, backend engineers, and business stakeholders to deliver products that are both technically solid and enjoyable to use. I believe a successful Front End developer should understand not only the code but also the goals behind the product. Technologies I work with As a Front End developer, my main stack includes: React Next.js TypeScript JavaScript React Native Angular Vue.js HTML5 CSS3 Tailwind CSS Material UI (MUI) SCSS Webpack Vite Node.js Over the years, I've helped companies hire a reliable Front End developer who can contribute quickly, improve existing codebases, and build new features with confidence. What I can help with As a Front End developer, I can help with: Building modern web applications from scratch Developing scalable React and Next.js applications Creating reusable component libraries Design system implementation Responsive and mobile-first development Performance optimization Server-Side Rendering (SSR) Progressive Web Apps (PWA) API integration Frontend architecture React Native mobile applications Refactoring legacy projects Bug fixing and maintenance Many clients choose me as a Front End developer because I can quickly understand business requirements and translate them into practical solutions. When companies need a Front End developer who can take ownership of a feature from planning to production, I can provide that support. I've worked as a Front End developer on both small startup projects and large-scale applications. My experience as a Front End developer allows me to adapt to different team structures, coding standards, and development processes. Although my primary role is a Front End developer, I also have experience with backend development. This broader perspective helps me become a more effective Front End developer because I understand how frontend systems interact with APIs, databases, and cloud infrastructure. I've worked with: PostgreSQL MongoDB MySQL Firebase Firestore Supabase AWS Node.js Python PHP This experience allows me to work effectively with backend teams and contribute as a Front End developer who understands the complete product lifecycle. How I work I believe a great Front End developer should focus on more than writing code. A Front End developer should understand user experience, accessibility, performance, maintainability, and business objectives. As a Front End developer, I value clear communication, ownership, and attention to detail. Every Front End developer should be able to balance technical excellence with practical business needs, and that's the approach I bring to every project. I've also contributed as a Front End developer in areas such as: Code reviews Technical planning Frontend architecture Git workflows CI/CD pipelines Agile development Team collaboration Mentoring junior developers Whether you need a Front End developer for a short-term project, a Front End developer for long-term collaboration, or a Front End developer to strengthen your current engineering team, I can help. My goal as a Front End developer is to build products that users enjoy using and that businesses can confidently grow over time. Companies often look for a Front End developer who can join an existing team and become productive quickly. Others need a Front End developer to help launch a new product or modernize an existing application. In both cases, I focus on delivering reliable, maintainable, and scalable solutions. If you're looking for a Front End developer with strong React expertise, modern frontend experience, and a practical approach to product development, I'd be happy to discuss your project. Best regards, Dmytro

If your application is lagging, your cloud bills are skyrocketing, or your codebase has become too messy to maintain — you don’t need more theoretical consulting. You need a hands-on fixer. I am a Solutions Architect and Technical Lead. I don’t just draw diagrams; I dive into the code, stabilize infrastructure, and lead a vetted team of senior engineers to execute solutions immediately. Whether you need an emergency fix or a complete system overhaul, we deliver fast, reliable results without the overhead of traditional agencies. ** WHAT I ACTUALLY DO (AND HOW MY TEAM EXECUTES):** ▪ Performance & Speed Optimization: Eliminate bottlenecks, optimize databases, and make your app lightning-fast. ▪ Emergency Production Fixes: Stop crashes, handle sudden traffic spikes, and restore system stability. ▪ AWS & Cloud Cost Reduction: Audit cloud infrastructure to slash monthly bills by 30-50% without losing performance. ▪ Legacy Code Modernization: Refactor heavy, unstable monoliths into clean, maintainable microservices. ▪ CI/CD & DevOps Automation: Build bulletproof deployment pipelines for predictable, zero-downtime releases. ** THE EXACT PROBLEMS WE SOLVE: ** ▪ "Our system slows down or crashes during peak traffic"➔ We implement smart caching (Redis), optimize MySQL/PostgreSQL, and set up proper autoscaling. ▪ "Our infrastructure costs are bleeding money"➔ We run a deep AWS/Cloud audit, remove resource waste, and right-size your servers. ▪ "Deployments are a nightmare and keep breaking things"➔ We pack your environment into Docker and build reliable CI/CD pipelines. ▪ "Technical debt is blocking us from shipping new features"➔ We clean up legacy PHP/Node.js code, establish clear boundaries, and accelerate development. ** TECH STACK WE DOMINATE: ** ▪ Backend: PHP (Symfony, Laravel, Laminas, Yii), Node.js (Microservices, REST & GraphQL APIs) ▪ Cloud & DevOps: AWS (EC2, RDS, ElastiCache, OpenSearch, S3, CloudFront), Azure, GCP, Docker, CI/CD pipelines ▪ Data & Caching: MySQL, PostgreSQL, MongoDB, Redis, Elasticsearch / OpenSearch ▪ E-commerce Infrastructure: High-scale Magento/Woocommerce backend setups, distributed commerce integrations, and performance rescuing. ** HOW WE WORK: ** ▪ No Overengineering: We focus on clean architecture and practical solutions that serve your business goals. ▪ No "Quick Fixes" That Break in 3 Months: We deliver scalable, long-term maintainability. ▪ Measurable Results: You get clear status updates, documented changes, and visible performance improvements. If your software system is struggling, costs too much, or has become a nightmare to maintain — let’s jump on a call and fix it properly.

Is your AI agent a production system or a fragile demo? Most AI agent projects collapse the moment they hit real traffic. 🏆 20+ years architecting production systems at principal engineer level 📊 $100K+ earned on Upwork across 32 architecture projects 🎯 100% Job Success Score, Top Rated Plus on Upwork ⚡ Built an MCP server connecting AI agents to live financial operations on Solana 💼 CEO at Osambit, a 20-person AI agent engineering team ✅ Enterprise Blockchain Architect certified, former Sr Principal Engineer at Nordstrom ⭐⭐⭐⭐⭐ "We've had the opportunity to collaborate with the Osambit team, and it's been a great experience. They're highly professional, responsive, and truly understand the final goal. Their technical expertise and ability to deliver on time have been key to the success." (Alwyn V., IXO World) As an AI Agent Architect with 20+ years of production engineering experience, I build AI agent systems using LangGraph, LangChain, and MCP that run in production, not prototypes that die in demos. Every AI agent project I take on starts with a decision graph - what the AI agent handles autonomously, what escalates to a human, and where it fails safely. That architecture-first approach is why my AI agent systems survive real traffic while cheaper builds collapse on edge cases. 🔶 IXO World (AI agent architecture): full-time Q4 2024 engagement | delivered on time | team collaboration verified by client testimonial above 🔶 Meteora + proprietary DLMM protocol (AI agent + DeFi automation): $81K engagement | MCP server linking AI agents to live trading operations | real-time autonomous execution with human-in-the-loop safeguards 🔶 Roover.AI (AI agent system architecture): intelligent B2B2C roof estimation platform | multi-modal RAG pipeline design | production deployment 🔶 Nordstrom (Sr Principal Engineer, 5 years): architected 9+ enterprise systems | supported 10 offshore engineering teams | supply chain, payment, logistics domains WHAT I DO ✅ AI Agent Architecture: decision graph design, multi-step workflow orchestration, human-in-the-loop control for every AI agent system ✅ LangGraph & LangChain Systems: production AI agent pipelines with state management and tool connectivity ✅ MCP Server Development: Model Context Protocol servers connecting AI agents to real business systems ✅ RAG Pipelines: retrieval-augmented generation grounding LLM answers in your knowledge base ✅ Multi-Agent Orchestration: CrewAI, LlamaIndex, and custom AI agent orchestration for complex agentic AI workflows ✅ AI Agent Security Hardening: prompt injection defense, data leakage prevention, auditability ✅ LLMOps & Production Deployment: tracing, observability, evaluation frameworks, regression testing for AI agent systems ✅ OpenAI & Claude API Integration: enterprise-grade AI agent integration with cost, latency, and failure-mode management WHO I WORK WITH 🎯 B2B and B2C companies building AI agent products, not one-off assistant setups 🎯 Founders and CTOs who need AI agent systems running in production with real users 🎯 Teams with multi-week engagements (4+ weeks minimum), not 5-minute tasks 🎯 Companies that understand AI agent architecture is a design problem, not a prompt problem 🎯 Clients who value senior engineering judgment over the cheapest hourly rate MY PROCESS 1️⃣ Architecture Review: 24-hour turnaround on a decision graph, failure-mode map, and scope estimate for your AI agent project 2️⃣ Design: AI agent flow specification, tool boundaries, escalation rules, evaluation plan 3️⃣ Build: production AI agent system with observability, security, and regression tests from day one 4️⃣ Deploy & Iterate: staged rollout, LLMOps monitoring, iterative refinement of the AI agent based on real usage Send me a message or invite me to your AI agent project. Free 24-hour AI agent architecture review available - no commitment required.

I help startups and B2B SaaS companies build, ship, and scale complete web applications powered by production-grade AI. Instead of hiring separate frontend, backend, and AI infrastructure engineers, I handle the entire product lifecycle — bridging the gap between robust, scalable full-stack architecture (NextJS, NodeJS, Python, AWS) and cutting-edge GenAI implementations (RAG pipelines, autonomous agents, and LLM orchestration). With 10+ years in full-stack development, $200K+ earned on Upwork, and a 100% Job Success Score (Top Rated Plus), I build with an ownership mindset to ensure your MVP hits the market fast and scales smoothly. ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🌐 FULL-STACK & AI CAPABILITIES — WHAT I BUILD ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ → Full-Stack SaaS Platforms: Complete web applications with responsive UIs, secure multi-tenant auth, and complex business logic (React, NextJS, TypeScript). → AI Agents & Agentic Workflows: Multi-agent systems capable of autonomous execution, tool usage, and function calling (OpenAI, Claude, Gemini). → Production RAG Pipelines: Enterprise semantic search utilizing vector databases (Pinecone, pgvector, Qdrant) for accurate, private data querying. → Robust Backends & APIs: Highly performant, clean-code REST/GraphQL APIs and microservices (NodeJS, NestJS, Python, Express). → Automated Business Workflows: Intelligent document processing, automated lead scoring, and custom CRM/ERP AI integrations. INDUSTRIES I SERVE WITH AI + WEB SOLUTIONS: - Multifamily Real Estate — Custom web software layered over Yardi, AppFolio, Entrata, ResMan, RealPage, Apartments com - Hospitality / Hotels / Restaurants — AI booking flows, guest communication platforms, and review automation dashboards - MarTech / AdTech — Complete web analytics suites integrated with AdTech and MarTech API, and others like Meta, Google, TikTok, Yelp, and UberEats APIs ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🏆 RESULTS FROM RECENT PROJECTS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ✔ AI Voice Agent SaaS Platform — Complete frontend UI/UX redesign + Supabase backend refactor, delivered in 90 days ($7,000 fixed price, 5.0 ★) ✔ Senior NodeJS SaaS Integration — 816 hours of self-driven backend delivery on schedule across 6 months ($32,633, 5.0 ★) ✔ AI-Powered Real Estate Onboarding — Built the web frontend and AI backend workflow that reduced onboarding drop-off and boosted conversions. ✔ Enterprise Software — Systems built by my team are used daily by Cushman & Wakefield (Fortune 500 real estate firm). ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ⚙️ TECH STACK ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ AI / LLM Integration: OpenAI API, Claude API, Gemini, LangChain, RAG, Vector Databases, Prompt Engineering, Function Calling, Structured Outputs Backend Development: Nodejs, NestJS, Python, Expressjs, Nextjs (Server Components) Frontend Development: React, TypeScript, Redux, Nextjs, Material UI, Tailwind CSS Mobile App Development: Flutter (Cross-platform, CI/CD with Codemagic) Cloud & DevOps: AWS (SQS, SNS, Lambda, RDS, ECS, ECR, CloudWatch, EventBridge, VPC, Route53, EC2), Terraform (IaC), Docker, Docker Swarm, Nginx Databases & Caching: PostgreSQL, MongoDB, MySQL, Redis, Pinecone, Qdrant, pgvector API & Enterprise Integrations (50+ types): REST / GraphQL / SOAP · OAuth2 / OIDC · Webhooks · ETL Pipelines · Payload Encryption ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🏢 ENTERPRISE & THIRD-PARTY INTEGRATIONS ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Property Management Systems (PMS): Yardi Voyager · AppFolio · Entrata · ResMan · RealPage · Apartments com Marketing & Social Platforms: Meta (FB/IG) · Google Suite · Twitter/X · TikTok · Yelp · UberEats Past Enterprise Client Impact: STIHL · Liebherr · Cushman & Wakefield ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 🤝 HOW WE WORK TOGETHER ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ → Discovery call → System architecture proposal → Milestone-based delivery → MVP in 6–12 weeks, production-ready scaling in 18–32 weeks → Available 30+ hrs/week, response time within 4–8 hours → Backed by a distributed team across 🇺🇦 🇵🇱 🇮🇹 🇷🇴 🇨🇦 if you need to scale resources rapidly I prioritize long-term, high-trust partnerships over quick fixes — 29 completed projects with an average engagement of 12-24 months. Let's jump on a call and map out what you're building.