With a deep background in Blockchain technologies, video streaming architecture, and full-stack system design, my team specializes in building highly-scalable, secure, and low-latency platforms tailored to client specifications. 🔗 Blockchain Development and Integration: Extensive experience leading projects like 𝐊𝐢𝐧𝐞𝐭𝐢𝐜, a multi-chain NFT aggregator and trading dashboard, 𝐌𝐮𝐬𝐭𝐚𝐧𝐠𝐜𝐡𝐚𝐢𝐧, a specialized blockchain solution for equine identity verification, 𝐍𝐅𝐓 𝐌𝐮𝐬𝐢𝐜 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 and 𝐏𝐥𝐚𝐲-𝐓𝐨-𝐞𝐚𝐫𝐧 𝐠𝐚𝐦𝐞. . 𝐊𝐞𝐲 𝐟𝐨𝐜𝐮𝐬 𝐚𝐫𝐞𝐚𝐬 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: Multi-chain interoperability across Ethereum, BSC, and other blockchains Smart contract engineering and deployment (Solidity, Rust) Token standard implementation (ERC-20, ERC-721, ERC-1155) Identity and data verification solutions using cryptographic hashes 📹 Advanced Video Streaming Solutions: Architected high-performance streaming systems with a focus on real-time media handling, including a 𝐒𝐮𝐫𝐯𝐞𝐢𝐥𝐥𝐚𝐧𝐜𝐞 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 𝐆𝐮𝐚𝐫𝐝 𝐓𝐨𝐨𝐥 featuring live streaming for real-time security monitoring, an 𝐞𝐋𝐞𝐚𝐫𝐧𝐢𝐧𝐠 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 with integrated video calls to enhance remote learning, an 𝐀𝐈-𝐏𝐨𝐰𝐞𝐫𝐞𝐝 𝐒𝐮𝐫𝐯𝐞𝐢𝐥𝐥𝐚𝐧𝐜𝐞 𝐒𝐲𝐬𝐭𝐞𝐦 designed for intelligent real-time analysis, and a 𝐂𝐨𝐧𝐭𝐞𝐧𝐭 𝐂𝐫𝐞𝐚𝐭𝐨𝐫𝐬 𝐒𝐭𝐫𝐞𝐚𝐦𝐢𝐧𝐠 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦 that empowers creators to engage with their audience and monetize their content effectively. 𝐊𝐞𝐲 𝐟𝐨𝐜𝐮𝐬 𝐚𝐫𝐞𝐚𝐬 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: WebRTC, HLS, and custom protocol integration for low-latency streaming Deployment and scaling of media servers like Kurento and Janus TURN/STUN configuration for NAT traversal, crucial for high-resolution video applications Adaptive bitrate streaming and multi-device support (iOS, Android, Web) 🧩 𝐊𝐞𝐲 𝐓𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥 𝐄𝐱𝐩𝐞𝐫𝐭𝐢𝐬𝐞: Blockchain: Solidity, Rust, Polygon, smart contract audits, tokenomics Streaming: WebRTC, Janus, Coturn, GStreamer, AioRTC, Redis, RabbitMq, Aiohttp, GStreamer, Elk, Kubernets && helm charts Back-end/API: Node.js, Python, containerized microservices (Docker, Kubernetes) Scalability: AWS, GCP, Redis, multi-regional deployment This hands-on, systems-level approach allows me to lead and optimize development teams, with a focus on creating resilient, innovative solutions that meet today’s tech demands. 💬 𝗥𝗲𝗮𝗱𝘆 𝘁𝗼 𝗱𝗶𝘀𝗰𝘂𝘀𝘀 advanced solutions that suit your tech stack and business goals? 𝘾𝙡𝙞𝙘𝙠 𝙩𝙝𝙚 "𝙄𝙣𝙫𝙞𝙩𝙚" 𝙗𝙪𝙩𝙩𝙤𝙣 𝙖𝙩 𝙩𝙝𝙚 𝙩𝙤𝙥 𝙤𝙛 𝙢𝙮 𝙥𝙧𝙤𝙛𝙞𝙡𝙚 𝙩𝙤 𝙙𝙞𝙨𝙘𝙪𝙨𝙨 𝙮𝙤𝙪𝙧 𝙥𝙧𝙤𝙟𝙚𝙘𝙩 𝙧𝙚𝙦𝙪𝙞𝙧𝙚𝙢𝙚𝙣𝙩𝙨.

Python backend & scraping engineer who builds data pipelines that survive anti-bot updates — and full-stack apps that ship on time. 4+ years, production-grade code, no guesswork. I help businesses turn messy or missing data into structured, reliable systems — and turn ideas into working web products. Recent results: 📊 Real estate data scraping (UK) — built and maintained a large-scale system bypassing anti-bot protection on a major property aggregator, updating daily. Powers a Chrome extension used for rental yield & profitability analysis. 💬 Telegram referral bot (retail chain) — grew to 5,000+ active users; 4,100+ joined via the referral system alone, replacing multiple manual tools with one automated flow. 🔍 Industry-wide data aggregation (semiconductor sector) — coordinated scraping across 100+ websites with different structures and blocking mechanisms, normalized into one centralized database. 🧠 AI + scraping infrastructure (real estate) — built a RAG system that uses past scraping cases to auto-generate new scraper pipelines, plus a computer vision model that calculates apartment area from floor plans. Full DevOps on Azure. What I bring: ✅ Clean, maintainable architecture — not just "it works," but "it scales" ✅ Anti-bot expertise (Cloudflare, CAPTCHA, rotating proxies, headless browsers) ✅ Full ownership from API design to deployment and support Core stack: Python, FastAPI, Django, React/Next.js, PostgreSQL, Docker, AWS/Azure, Scrapy/Playwright/Selenium. Have a project in mind? Send me the details — I'll reply with a concrete plan and timeline within a day.

👋Hello there! I'm a passionate and experienced developer with a keen eye for detail and over 7 years of commercial experience. With a solid background in both front-end and back-end development, I bring to the table a unique blend of creative flair and technical expertise. ꜱᴋɪʟʟꜱ: ⚫𝐅𝐫𝐨𝐧𝐭-𝐞𝐧𝐝: JavaScript, TypeScript, Vue.js, React, Angular ⚫𝐁𝐚𝐜𝐤-𝐞𝐧𝐝: Python, Golang, Node.js, Java, C#, Ruby, PHP ⚫𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞: PostgreSQL, MySQL, MongoDB, Redis ⚫𝐎𝐭𝐡𝐞𝐫: Docker, NGINX, Git, RESTful APIs, Figma, Responsive Design ꜱᴇʀᴠɪᴄᴇꜱ: ⚫ Custom Web Application Development 💻 🟠 API Integration and Development 🔌 ⚫ Responsive Website Design 📱 🟠 Database Management and Optimization 📊 ⚫ Performance Optimization and Scalability 🚀 🟠 Bug Fixing and Maintenance 🕵 ⚫ Technical Consultation and Support 🛠️ ᴡʜʏ ʜɪʀᴇ ᴍᴇ? ⚫ Extensive experience in delivering high-quality web solutions tailored to clients' needs. 🟠 Strong problem-solving skills and ability to think creatively to overcome challenges. ⚫ Diligent attention to detail to ensure pixel-perfect designs and flawless functionality. 🟠 Excellent communication skills for seamless collaboration and project management. ⚫ Commitment to meeting deadlines and delivering projects on time. ⏰💼 ʟᴇᴛ'ꜱ ᴄᴏɴɴᴇᴄᴛ: I'm always eager to discuss new projects and opportunities. Feel free to reach out, and let's turn your vision into reality! 📩 Buzzwords: Full-Stack Development | MERN Stack | MEAN Stack | React.js | Vue.js | Angular | Node.js | Express.js | Next.js | Nuxt.js | RESTful APIs | GraphQL | MongoDB | MySQL | PostgreSQL | Firebase | Docker | Kubernetes | AWS | Azure | GCP | CI/CD | Agile Methodologies | TDD | BDD | DevOps | Microservices | Responsive Design | UX/UI Design | Web Applications | Progressive Web Apps | Single Page Applications | Serverless Architecture | Cloud Computing | Version Control | Git | Frontend Development | Front-End Development | Front End Development | Backend Development | Back-End Development | Back End Development | API Integration | Security Best Practices | Performance Optimization | Scalability | Cross-Platform Development | Mobile App Development | HTML | CSS | JavaScript | TypeScript | SASS | LESS | Bootstrap | Tailwind CSS | Webpack | Babel | SEO Optimization | User Authentication | Authorization | WebSockets | Real-Time Applications | Test Automation | Unit Testing | Integration Testing | End-to-End Testing | Code Review | Continuous Integration | Continuous Deployment | Technical Documentation | Software Architecture | System Design | Project Management | Collaboration Tools | Jira | Trello | Asana | Slack | Python | Django | Flask | Ruby | Ruby on Rails | PHP | Laravel | Symfony | Java | Spring Boot | Kotlin | Swift | Objective-C | C# | .NET | ASP.NET | VB.NET | Go | Golang | Rust | Elixir | C++ | C | Scala | Perl | Haskell | R | MATLAB | Julia | TensorFlow | PyTorch | OpenCV | Xamarin | Ionic | Apache | Nginx | Redis | Elasticsearch | RabbitMQ | Kafka | Jenkins | CircleCI | Travis CI

Data and AI teams hire me when they need one engineer who can own the Python backend, build the ETL pipeline, and integrate LLM models without splitting that into three separate roles. 6 years, AWS Certified Cloud Practitioner, 100% JSS, $20K+ earned on Upwork. One unusual differentiator: I hold a Master's degree in Radiology from Kharkiv National Medical University. For Healthcare AI and medical data products, I understand the domain, not just the stack. What I have built: AI Website Builder (2 years, Lead, team of 15): led backend architecture for an AI-powered page generation platform. LLM content generation, SEO processing, async delivery via Celery and Redis. Stack: FastAPI, OpenAI, LangChain, PostgreSQL, AWS, Docker, React, Stripe. Sensitive Data Monitoring SaaS (1.5 years): high-load backend scanning cloud sources for sensitive data leaks. Distributed processing with Kafka, NLP and OCR detection pipelines, Elasticsearch and Cassandra at scale. Stack: Python, FastAPI, Kafka, Elasticsearch, Neo4j, Redis, AWS. Blockchain Security Platform (1 year, team of 13-15): ETL pipelines for detecting suspicious wallet behavior across blockchain data. Graph database modeling with Neo4j, full AWS infrastructure. Stack: Python, FastAPI, Neo4j, PostgreSQL, AWS (EC2, ECS, RDS, Lambda). Web Automation Platform (1 year): reverse-engineered authenticated HTTP request flows, automated login and data extraction workflows, session management and CSRF handling. Stack: Python, asyncio, aiohttp, Playwright, Docker. On Upwork: 10 contracts, $20K+ earned, 313 hours, 100% JSS. Python ETL, web automation, data extraction, scraping pipelines. How I work: Requirements and solution design before implementation. I take ownership from spec to production. Unit tests, async-aware Pytest coverage, API documentation maintained throughout the project. I communicate clearly on blockers without being asked. I operate with the full backing of Meduzzen's senior engineering team. Every commit I ship is peer-reviewed by our internal technical leads before deployment. If I am unavailable, your sprints do not stop: a fully briefed Meduzzen engineer provides immediate coverage. One point of contact, zero single-point-of-failure risk. Core stack: Python, FastAPI, Django, PostgreSQL, Redis, Celery, Kafka, Elasticsearch, Neo4j, Docker, Kubernetes, AWS (EC2, ECS, RDS, Lambda, S3), LangChain, OpenAI, React, TypeScript, GitHub Actions. If you need a Python backend engineer who can own data pipelines and AI integration in the same role, send me the architecture brief. I will tell you how I would structure it.

I'm a Full-stack Web Developer who’s working with the up-to-date and most effective technologies. I specialize in JavaScript plus frameworks/libraries based on this language. To ensure the highest quality standards, I tend to adhere to best coding practices. My technology stack: - JavaScript/TypeScript - React v18, Next.js - Redux-Toolkit, MobX, Jotai, Zustand - React Query, SWR - Vue 3, Vue-router, Pinia, vee-validate - MUI/React-bootstrap - HTML/CSS/SCSS - Node.js - Express.js - Sequelize - PostgreSQL Text me right away so we can discuss everything and start work immediately.

I represent an award-winning company called LITSLINK. We are a product-oriented development team (which consists of 250+ highly qualified software engineers, UI/UX designers, business analysts, project architects, project managers, and QA engineers) experienced in almost all popular areas: ✅ AI: Machine Learning, Computer Vision, Natural Language Processing, Big Data Analytics ✅No-code, Low-code: Bubble, WebFlow ✅ Blockchain: Solidity, Rust, Solana/Near blockchains, smart contracts ✅ Cross-Platform Mobile development React Native, Flutter ✅ Web development: Front-end (React.JS, Vue.JS, Angular.JS); Back-end (Node.JS, Java, Python) ✅ AR/VR: Untiy3D/C#, Hololens, Hololens 2, GearVR, MS Mixed Reality, Oculus, HTC Vive, iOS/Android (AIRKit, ARCore) We provide smart and fast solutions on time and on budget. By hiring us, you are getting the expertise of our software architect board and the whole team's knowledge. Whether you need a single developer or a whole team, we are here to help.

𝐓𝐨𝐩 𝐑𝐚𝐭𝐞𝐝 𝐖𝐨𝐫𝐝𝐏𝐫𝐞𝐬𝐬 𝐄𝐱𝐩𝐞𝐫𝐭 | 𝟏𝟐𝟎 + 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐝 𝐩𝐫𝐨𝐣𝐞𝐜𝐭𝐬 😎 Are you seeking to boost sales, enhance brand visibility, or improve communication with your audience? I specialize in designing professional corporate websites that effectively convey your message and drive tangible results. 🚀 With extensive experience in WordPress development, I excel at delivering rapid and effective custom web solutions tailored to align perfectly with your business objectives. Services: ✔ Custom web development utilizing WordPress, WooCommerce, and PHP ✔ Development of custom plugins/themes ✔ Optimization of website performance ✔ UI/UX & web/mobile design ✔ Brand identity creation With a decade of experience in developing WordPress business websites, I employ advanced techniques to showcase your products, services, and unique company narrative effectively. This ensures maximum customer engagement through a compelling online presence that meets their expectations. You can expect a blend of innovation and creativity in your project. To me, challenges represent opportunities to discover unique solutions that enhance your online presence and fulfill your business goals. 🌐 Do you aspire to establish a robust online presence for your business? Let me transform your ideas into reality and facilitate your business growth. I focus on creating user-friendly and visually appealing custom websites using WordPress. Each project is individually crafted to meet your precise needs and preferences. My expertise encompasses developing tailored themes, modifying existing ones, and customizing plugins with specialized coding to provide distinctive solutions. 👌 Proficient in English 🏆 100% job success rate with a 5⭐️ rating. Despite the challenges posed by the ongoing conflict, I have relocated to a secure area to ensure seamless work and continue supporting Ukrainian troops with a portion of my income. 💯 If you need an experienced web developer to establish a custom online presence for your business—from concept to a finished, polished, and professional site—I am here to assist. 🛠️ Skills: WordPress, WooCommerce, Elementor; Web Development; CMS Development; Blogging; Website Redesign; API Development; UX & UI; Custom Web Design; Responsive Web Design; Figma; Website Customization; Landing Pages; Web Applications; Wireframes; Web Design, Graphic Design, Mockups; GIT, GitHub; HTML, HTML5, CSS, CSS3, JavaScript, JS; API, CRO, Google Analytics 4, Google Search Console; All in One SEO; Mockups; Style Guides; Adobe Photoshop; E-commerce Website Development; User Flow; Lead Generation; MySQL; SEO Plugins; Bootstrap; jQuery; Website Maintenance; Website Optimization; REST API; ACF Plugin; Website Security.

SaaS products break at the seams, between services, payment systems, third-party APIs, and the business logic holding it all together. I built the backend infrastructure that keeps those seams solid. With 12+ years of engineering experience and deep focus on Python (FastAPI, Django) , I ship production SaaS that handles real load: multi-tenant platforms, Stripe billing, CRM/ERP integrations, and React frontends connected to complex backends. Where I add the most value: → SaaS backend architecture (FastAPI, Django, PostgreSQL) → API design and third-party integrations (Stripe, CRMs, ERPs) → Multi-tenant platform infrastructure → React frontends connected to complex backends → AI feature integration (OpenAI, LangChain) built into the system If you need a system that works in production, not just in demos - let's talk.

Hey there! Looking for a skilled developer who actually gets things done? Let’s skip the hassle and get straight to work. No fluff, no wasted time – just clean, efficient, and scalable code. I’m Denis, a Full Stack Developer with a solid track record of delivering high-quality web solutions that don’t just work but work brilliantly. As a full-stack developer, I aim to deliver clean, maintainable, and scalable code to ensure your product works efficiently. I work with PHP, Laravel, and REST APIs for back-end development, and I use GraphQL when more flexible data querying is needed. For front-end development, I rely on React.js, Next.js, and TypeScript, using Material UI for creating user-friendly interfaces. I have experience with databases like MySQL, PostgreSQL, MongoDB, and DynamoDB to handle data storage and management. On the cloud and DevOps side, I use AWS services such as EC2, S3, and Lambda, along with Docker for containerization. I also have experience with Google Cloud Platform. I integrate third-party APIs and Webhooks when necessary to extend functionality. To keep things organized, I rely on tools like Git, GitHub, GitLab, Jira, Trello, ClickUp, and Asana for version control and project management, ensuring smooth collaboration throughout the development process. I’m ready to assist with projects in e-commerce, SaaS, fintech, healthcare, real estate, education, CRM and more. If you have a unique idea, I’m always up for a challenge! ⭐ My hall of fame: 💬 "Extremely skilled in PHP and Laravel, completely autonomous, and able to adapt to new technologies. The speed and quality of his work were impressive!" 💬 "Highly recommended! Denis is not only technically skilled but also great at communication. Quick responses and always available during working hours make the development process smooth." Debating your options? Or ready to talk details and start working? Just hit add my profile to favorites and reach out! Denis Upfated: February, 23, 2025

Experienced software engineer delivering end-to-end product development - from concept and architecture to deployment and production scaling for both web and mobile applications Strong experience developing AI-powered products, including LLM integrations, intelligent automation, data processing pipelines, and AI-driven SaaS platforms Designed and built scalable distributed systems and cloud-native platforms on AWS, Google Cloud, and dedicated infrastructure, focusing on reliability, performance, and maintainability Achievements: Web applications, SaaS Platforms & Business Systems * Designed scalable backend architectures and cloud infrastructure for business applications. * Developed asset maintenance and management platforms for tracking equipment, scheduling maintenance, and generating automated reports. * Integrated with multiple 3rd party providers to support large-scale products * Built analytics dashboards that allowed cutting costs and increased companies profit * Built IoT platforms for management and operational tools for maintenance Cross-Platform Mobile Apps * Built cross-platform apps for business operations and service platforms * Delivered production-ready applications for both iOS and Android * Built mobile tools connected to SaaS platforms for asset management and reporting High-Load Data & Backend Systems * Developed data aggregation services processing millions of API requests daily * Designed microservices and scalable backend architecture for high-traffic marketing systems * Optimized performance and database structures to support rapid growth and unpredictable load spikes