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I am a highly skilled C#.NET Azure Umbraco developer with 19 years of experience. Microsoft certified. AI-native (Claude Code). Deliver custom or CMS-driven websites and web apps with scalable backend and pixel-perfect markup. Require minimal supervision, easily understand business requirements, and possess a problem-solving, product-oriented mindset. Over my career, I've completed 110+ projects for SMEs. Key Technologies: - ASP.NET MVC and ASP.NET Core - Databases: MSSQL, PostgreSQL - Frontend: JavaScript, TypeScript, React, AngularJS, Tailwind CSS, Sass/Scss, Bootstrap - Azure (Microsoft Certified): Azure DevOps, Azure Compute, Azure Web Apps, Azure SQL, Functions, Containers - AI-assisted development with Claude Code - Umbraco CMS - Desktop: WPF My Services: - AI-assisted custom web app development - Payment gateways integration: Stripe, PayPal API, Authorize.NET - Full cycle business website development and setup with Umbraco CMS - Umbraco CMS upgrade and migration - CRM, ERP, Social media website integration - Email and SMS sender integration: SendGrid, Twilio, Mailchimp - Website or web app migration to Azure cloud - Website infrastructure support and maintenance - Website performance optimization - CI/CD (Git, Azure DevOps, Github, TeamCity) setup

🔥 Send me your idea — and I’ll give you a free initial consultation with practical thoughts, possible solutions, and a rough time and cost estimate. Legacy systems draining budget, slowing delivery, and blocking growth? At OSKI Solutions, we help companies modernize legacy applications and build scalable cloud-ready products with our 3x delivery strategy: experienced engineers + AI-assisted coding + disciplined execution. That means you get more than just developers. You get a team that can move significantly faster on implementation, reduce repetitive work through AI-assisted workflows, and still keep architecture, maintainability, and business priorities under control. Most of our engineers are from Ukraine, and we’ve built a delivery model that combines strong technical talent with modern AI tools to help clients ship faster without sacrificing code quality. Over the past 20+ years, I’ve worked as a senior engineer, architect, and ex-CTO, helping startups, SMBs, and enterprise clients rebuild outdated systems into secure, scalable, future-ready platforms. We work hands-on with .NET, Node.js, React, and modern cloud infrastructure to turn brittle systems into products that are easier to maintain, extend, and grow. What we do best Backend Development .NET Core, ASP.NET MVC, C#, Entity Framework Node.js, Express, REST APIs, GraphQL APIs Microservices, event-driven systems, business-critical backend logic Frontend Development React, Next.js, TypeScript, Redux Angular, Vue.js, SPA and PWA development Responsive interfaces, Tailwind, Material UI Legacy Modernization Legacy .NET and custom business platform modernization Monolith to modular/cloud migration Performance, maintainability, and technical debt reduction CMS & Business Platforms Umbraco CMS, Umbraco Cloud, migrations, custom development ERP-related systems and workflow platforms Internal tools, client portals, dashboards, admin systems Cloud & DevOps Azure, AWS, Google Cloud Docker, Kubernetes, CI/CD pipelines GitHub Actions, GitLab CI, deployment automation Databases SQL Server, PostgreSQL, MySQL MongoDB, Redis, caching and query optimization API Integrations & SaaS Stripe, PayPal, Twilio, SendGrid Slack, Shopify, Zoom, QuickBooks, Google Maps SaaS integrations, workflow automation, external service connectivity Why clients choose OSKI Solutions 3x delivery strategy: senior engineers + AI-assisted coding + structured execution 20+ years of experience modernizing complex systems CTO-level thinking focused on business outcomes, not just tickets Full-cycle delivery from architecture to deployment Lean, practical approach that keeps MVPs and modernization efforts within scope Clear communication with weekly demos, tracked hours, and transparent reporting Selected results One Motion Technologies — designed and built ERP system from scratch TutorPro — helped scale a SaaS platform, supporting 3x adoption growth in 2 years Umbraco platforms — delivered 15+ CMS and business platforms, including cloud migrations and integrations What our 3x approach means in practice We use AI to accelerate coding, prototyping, refactoring, and repetitive engineering tasks — but not to replace engineering judgment. The result is: faster delivery, cleaner implementation, better budget efficiency, and a stronger technical foundation for future scaling. 💬 Send me a message, and I’ll review your project, suggest the best approach, and give you a realistic next-step plan.

I have more than 15 years of programming experience. As a freelancer, I have broad experience: I developed web (ASP.NET, Python, PHP), desktop (C++, C#, Python — Linux and Windows) and mobile (Android — Java, C++) applications. I list here some of my jobs. C#: * clubspeed.com — a large software suite for family entertainment clubs; included C# code (80%), including CoreApi and ASP.NET Razor, plus PHP (Laravel) and Node.js code (for low-level car racing control tasks). I developed it as a team member. * qadra.com — a financial company; C# code (80%), Python (some microservices are Python/Flask based, 20% of code), AWS-hosted with Docker containers and Lambdas. I developed it as a team member. * enven.nl — implemented from scratch their non-public partners portal: ASP.NET Razor and some CoreApi endpoints. * ASP.NET website for house rentals. * ASP.NET website for remote control of a robotic device via a WebSocket connection. * Vegetable-oil plant automation desktop program (C# + WinCC). Python: * Embeddable fact-checking chat that uses the LangGraph framework to implement a customizable LLM/AI backend (OpenAI, DeepSeek, Hugging Face, or Ollama). It allows administrators to embed the component in their websites so users can ask questions about facts described in articles and verify whether facts listed in an article are true. It included agentic code and many external APIs to check facts (not just asking an LLM), and even computer vision to inspect website photos (OpenCV). Backend is FastAPI. * AI/LLM-based ad selection for a website (FastAPI and LangGraph). It processes website text or chat messages and selects ads of different types related to the content. It contains SDKs for embedding ads on many platforms, including Go, React, and plain HTML. * Polish-language training software, based on Django and LangGraph. * Many small projects: desktop scripts, web scraping (Selenium and related tools), and simple AI agents. C++: * Factory equipment monitoring system (Ubuntu Linux, custom server over TCP/IP, web interface in PHP). * Many small projects, some of which are mentioned in reviews on this profile; many are non-public. * Powerful software for automated ad submission on social networks (massive bots that send millions of messages). PHP: * 20+ websites — without CMS, with my own CMS, and with open-source Drupal, WordPress and Joomla CMSs. * Backends for Android applications. Android: * SOCKS5 proxy application that allows sharing mobile VPN with non-mobile clients via the SOCKS protocol. * Many WebView-based "business card" applications. * Dating-related applications, including erotic puzzles. Human emulation: * Spam bots — I cannot provide a specific list of such software for legal reasons. * Automatic checkout on eBay and similar websites. * PayPal automatic payments. * Data scraping, including air tickets and goods in online stores. Reverse engineering — I cannot provide a specific list of reverse-engineered software for legal reasons. * Java bytecode reverse engineering, including Android. * .NET bytecode reverse engineering. * Machine code for 32-bit and 64-bit x86 and ARM CPUs. Assembler: * High-performance cryptographic library for x86\_64 CPUs.

✔ 100% Job Success ✔ 15+ years experience ✔ 4000+ hours worked on Upwork with excellent client feedback. I'm an experienced software engineer who has spent 11+ years designing and developing various win, web and mobile applications. My main principals are the following: - Clean code, - Automation of processes, - Lack of nothings. Important to say, that I always try to find simple and elegant solutions for complex technical problems. Satisfied customers and thankful clients are the main factors that can confirm my professionalism ● General ⠀⠀✔ C# ✔ .Net ✔ Design Patterns ✔ MS Visual Studio ✔ DevExpress XAF ● Web Dev ⠀⠀✔ ASP.NET MVC ✔ ASP.NET Web API ✔ WCF ✔ JavaScript ✔ jQuery ● ORM ⠀⠀✔ Entity Framework (Code-First, Database First) ✔ XPO ● Database ⠀⠀✔ T-SQL ✔ MS SQL ✔ MySQL ✔ MongoDB ✔ Oracle ✔ PostgreSQL ● Version Control System ⠀⠀✔ TFS ✔ Git ● Reports ⠀⠀✔ Crystal Reports ✔ Fast Report ✔ DevExpress Reports ● CMS ⠀⠀✔ Umbraco ● Other skills ⠀⠀✔ Data Scraping ✔ Parsing Feel free to contact to know more about my work and how I can help you.

🚀 Senior Frontend Developer | React, TypeScript, Angular | 11+ Years of Experience Are you searching for a highly skilled and reliable frontend expert who delivers scalable, accessible, and pixel-perfect UI? I’m Pavlo Vinnyk, a Senior Frontend Developer with over 11 years of commercial experience creating modern web applications that are fast, maintainable, and user-friendly. From award-winning landing pages to large-scale platforms in edtech, devops, and media, I’ve built performant interfaces that solve real business problems. I bring both strong technical know-how and a proactive mindset — collaborating smoothly with designers, engineers, and stakeholders. 💼 What I Can Do for You: ✅ Build robust React-based interfaces with TypeScript, Redux, RTK, Next.js ✅ Migrate legacy code to modern UI libraries like Material UI or TailwindCSS ✅ Develop and scale component libraries (Storybook, BEM, SCSS, Figma integration) ✅ Ensure top-level accessibility (WCAG, VPAT, JAWS/NVDA testing, axe-core) ✅ Implement automated testing (Jest, Selenium, Percy, Playwright) ✅ Work with data: REST, GraphQL, RPC, BigQuery, GCP, D3.js ✅ Deliver clean code that’s testable, modular, and optimized for performance 🧰 Tech Stack Languages: JavaScript (ES6+), TypeScript, HTML5, SCSS/sass Frameworks: React, Redux Toolkit, Zustand, Next.js, Angular, AngularJS Testing & QA: Jest, React Testing Library, Selenium, Percy, Playwright Tools: Storybook, Webpack, Gulp, npm, Git, Jira, Confluence Other: Umbraco, nopCommerce, Razor Templates, GraphQL, D3.js 🎯 Soft Skills & Mindset ✔️ Strong communicator and team player — I thrive in cross-functional teams ✔️ Self-organized, proactive, and result-oriented ✔️ Focused on accessibility, performance, and maintainability ✔️ Comfortable working in Agile/Scrum setups with distributed teams ✔️ Fluent in technical documentation and collaborative workflows 🌍 I’ve contributed to global platforms used across the USA, Canada, LatAm, and Europe — helping companies scale with confidence. Whether you need a long-term partner or a senior developer to jump in fast — I bring clarity, experience, and delivery focus. 📩 Let’s work together to build something impactful. 🔍 #SeniorFrontendDeveloper #ReactDeveloper #TypeScript #ReduxToolkit #NextJS #AngularDeveloper #WCAG #MaterialUI #UIComponentLibrary #Storybook #GraphQL #WebAccessibility #CleanCode #UpworkFreelancer #FrontendExpert #RemoteDeveloper #GCP #D3js #Jest #Playwright #Selenium #PixelPerfectUI #UIUX

- Over 12 years of software development experience in various-sized projects; - Strong experience in designing and developing OOP solutions using .NET platform; - Solid experience in Sitecore CMS v6.5 - 9 - Great experience in business domain and functional requirements analysis, building appropriate architectural solutions; - Strong experience in web-client technologies such as HTML, XML, JS, CSS; - Good experience in system integration with .NET based Web Services; - Experience in “spaghetti” code refactoring and business logic performance optimization; - Experience in existing software support and maintenance; - Technology domination was achieved in ASP.NET, Sitecore, ASP.NET MVC, MSSQL Server.