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If your system got slower over time and nobody really knows why — that’s usually where I come in. Most developers avoid messy data, slow queries, and systems nobody wants to touch. That’s where I do my best work. My core is .NET and SQL. Not just writing queries, but understanding why things break when data grows, and fixing it without turning everything upside down. What I work with: • C# / .NET — data processing, automation, background services, desktop tools • SQL (deep) — complex queries, performance tuning, execution plans, large datasets • APIs & backend — REST, Node.js, Linux deployments • Automation — Selenium, scraping, data pipelines, legacy integrations • Infrastructure — Docker, Linux, FastAPI, PostgREST, full stack setup • Frontend — AG Grid, WordPress customization I also use AI in real work — tools like Claude and AI agents help me move faster, understand unfamiliar stacks, and scale solutions without slowing down. So if your project runs on something new — that’s not a blocker. I’ve worked with old and undocumented systems too — where you don’t have docs, only behavior. If you already tried the obvious fixes and they didn’t work — that’s usually when I get involved. I don’t need long explanations. I read the system, find the real issue, and fix that. I won’t promise miracles. But I will tell you exactly what’s wrong and what it takes to fix it.

Plugins, extensions, browser protection development. More than 11 years of development the software that extends browser's abilities. Extensions for main browsers (Chrome, Firefox, Safari, Opera, Internet Explorer, Microsoft Edge). Web Scrapers (Web Scraping, Data Scraping, Data Extraction, Data Mining). Scrape information from social media, ecommerce, real estate, etc sites. Porting the extensions between different browsers. Porting FireFox extensions from XUL/XPCOM to WebExtension architecture. Communication between extensions and Windows applications (Native Messaging). Extensions deobfuscation. Installing the extension from standalone installer (for Windows). Converting extension from Manifest V2 to Manifest V3 Protection against key-logging, formgrabbing, etc (Zeus-like troyans) for all common browsers. POS protection. Extensions for social networks. Automation for Amazon, Ebay, Facebook, LinkedIn, AngelList, AliExpress, Twitter, GMail, LinkedIn Voyager API Airtable API TradingView. Real Estate sites scrapers/bots. Extensions for Outlook. Integration with Trello, Podio, JIRA, Slack, mySMS Integration with SCATT trainer system Telegram web, WhatsApp web integration. Canon SDK (EDSDK, CDSDK) Nikon SDK Javascript, React.js, Vue.js, Google Sheets Automation (Apps Script). Python (Beautiful Soup, Scrapy, Selenium, Playwright) Delphi5-XE8 C#, Windows Forms, WPF RS-232 (RS232) port communication Telegram TDLib Inno Setup. MaxMind GeoIP

I am a highly skilled Umbraco, ASP.NET Core, and C# expert, ranking in the Top 1% for .NET/C# skills with 21 years of C# experience. I specialize in delivering fast websites with intuitive backends and pixel-perfect markup. Over my career, I've successfully completed 100+ projects on time and within budget for both large and small companies. Key Technologies: - Umbraco (Versions 15, v7-v14), Composing, Dashboards, Custom Property Editors, Custom Trees - Umbraco migration from 7 to latest, from 8 to latest, uSync, and upgrade expertise - Migrate from Wordpress to Umbraco - ASP.NET and ASP.NET Core - eCommerce platforms: Vendr, Stripe, uCommerce, Merchello - Umbraco Cloud (UaaS) and Azure - Integration of APIs: Facebook, Linkedin, Amadeus, Expedia, Mellowood, CourseStorm - Payment gateways: Stripe, MerchantWarrior, WorldPay, PayPal API, SagePay, GlobalPay - Databases: MSSQL, MySQL, PostgreSQL, Oracle - Frontend: HTML5, video integration, AngularJS, Tailwind CSS, Sass/Scss, Bootstrap, Zurb Foundation 6 - Version control: Git, SVN, GitHub, Bitbucket - Project management tools: Trello, Asana, Jira, Figma, PSD I excel in both collaborative large-team projects and independent work on smaller projects, requiring minimal supervision. My technical versatility and adaptability make me an ideal candidate for various projects in Umbraco, ASP.NET, C#, and related technologies.

Senior Full-Stack Developer • Performance Optimization Expert Java, Kotlin, JavaScript (frontend/backend), C++, Python, PHP, Perl SQL/NoSQL, Web/Desktop apps, Automation, Web Scraping I help companies make their software faster, lighter, and more efficient. 20+ years of hands-on experience in system performance tuning, profiling, solving bottlenecks, and refactoring legacy systems. If your application is slow, unstable, memory-hungry, or needs deep analysis — I can fix it. ⸻ 🧩 My Core Expertise • Performance optimization (Java/JVM, databases, backend services) • Query optimization, memory leak detection, code profiling • Refactoring legacy code, stabilizing old systems • Full-stack development (Java/Kotlin + JS, Python, PHP, Perl, C++) • Web automation & scraping • Systems analysis, debugging, complex issue resolution ⸻ 🚀 What I Deliver • Faster request processing • Reduced memory & CPU usage • Significantly improved database performance • Clean, maintainable, well-structured code ⸻ 🤝 Availability Open to long-term or part-time collaboration (30–40 h/week). Also interested in innovative startups: your idea — my implementation. ⸻ Let’s make your software fast, stable, and scalable!

🏆 AUTODESK-CERTIFIED EXPERT & PUBLISHED AUTHOR I specialize in cutting-edge AI-powered CAD solutions that transform how engineering teams work. As author of "Autodesk Vault Programmer's Cookbook" and Autodesk Expert Elite Member, I combine deep CAD expertise with advanced AI capabilities. 🚀 CORE SPECIALIZATIONS: • AI-CAD Integration (LLM + CAD workflows, text-to-model generation) • Autodesk Platform Services (APS/Forge) custom applications • Vault PDM Implementation & Migration (6+ enterprise deployments) • Fusion 360 API Development & Automation • Python-based CAD workflow automation • OCR + AI document processing for engineering 💼 RECENT PROJECTS: • Built AI-powered document analysis systems for manufacturing • Automated SolidWorks workflows saving 40+ hours/week • Implemented enterprise Vault systems for global teams • Created custom Fusion 360 plugins for design automation Ready to 10x your engineering productivity with AI-powered CAD solutions.

Senior .NET developer with 25+ years of hands-on experience working on real production systems. I help companies stabilize, modernize, and extend desktop and legacy .NET applications, taking ownership of existing codebases and delivering clean, maintainable solutions that work reliably long-term. Most of my work involves improving existing Windows desktop applications rather than building throwaway prototypes. I regularly take over mature or poorly documented systems, identify structural and stability issues, and extend functionality without disrupting production workflows. Clients usually come to me when a system is business-critical and needs careful, senior-level handling. My core expertise is in Windows desktop development using C#, WPF, WinForms, and the .NET Framework. I also have extensive experience supporting and modernizing legacy systems built with VB.NET, VBA, C++, and Delphi, including Office automation, custom installers, file system integration, and data-processing tools. For modernization and supporting services, I work with .NET Core, ASP.NET, Razor Pages, and REST APIs, which allows me to evolve legacy desktop systems, build internal web tools, or deliver complete end-to-end solutions when needed. I follow proven architectural practices such as MVVM, layered design, version control with Git, and predictable deployment processes. I’ve completed 120+ projects and 37,000+ hours on Upwork, working primarily on long-term and technically demanding systems where reliability, clarity, and ownership matter more than quick fixes. If you’re looking for a dependable senior .NET developer who can take responsibility for an existing system or build a stable desktop application from scratch, I’d be happy to discuss your project.