Den M.

🚀 Senior Full-Stack .NET / C# Developer & AI Integration Engineer | Claude, OpenAI, AI Agents, n8n, Azure Senior full-stack engineer specializing in .NET (C#, ASP.NET Core), Node.js, Azure, and AI-powered solutions that cut development time and operational costs. I integrate LLMs (Claude / Anthropic API, OpenAI) directly into applications, shipping real production features, not just prototypes. With over 10 years of experience in software development, I've had the privilege of collaborating with companies across Germany, the United Kingdom, Australia, and the USA, including almost 5 years at Endava as a Senior Full-Stack Developer / Team Lead for distributed teams in Australia, Vietnam, and India. Today I specialize in AI-powered and AI-automated solutions: LLM integrations, AI agents, RAG, MCP servers, and n8n workflow automation. My core stack: .NET, C#, Node.js, React, Angular, React Native, Next.js, TypeScript, Docker, Azure, AWS, Headless CMS, MSSQL, PostgreSQL, Cosmos DB, and MongoDB. I also work with MCP servers, Claude Code, and AI-assisted development pipelines to accelerate delivery without sacrificing code quality. My journey has taken me through enterprise and SaaS projects from inception to completion, giving me a comprehensive understanding of the full development lifecycle. I focus on crafting robust, scalable solutions, now augmented with AI automation where it genuinely adds value: marketplace integrations, data enrichment, intelligent document processing, customer support automation, and developer tooling. 💡 HOW I CAN HELP ✅ AI Integration & LLM Development Claude (Anthropic API), OpenAI / ChatGPT API, LangChain, RAG pipelines over vector stores, prompt engineering, AI chatbots, and AI features inside your existing product. ✅ AI Agents & MCP Agentic workflows with Microsoft Agent Framework and Hermes AI Agent, custom MCP (Model Context Protocol) servers and integrations. ✅ n8n & Workflow Automation AI automations, webhooks, third-party API and marketplace integrations, data enrichment, document processing. ✅ .NET / C# Backend ASP.NET Core, Web API, REST APIs, microservices, event-driven systems (Kafka, Azure Service Bus), DDD, TDD, legacy .NET modernization. ✅ Frontend & Mobile React, Next.js, Angular, TypeScript, React Native, Flutter. ✅ Cloud & DevOps Microsoft Azure (Functions, Service Bus, AKS, Cosmos DB), AWS, Docker, Kubernetes, GitHub Actions, CI/CD. ✅ SaaS, Payments & Headless CMS SaaS platforms from MVP to production, Stripe integrations (checkout, subscriptions), Contentful, Umbraco. 📌 SELECTED PROJECTS 🔹 Manufacturing (Bradken): led development of a global digital platform combining data analytics, cloud services, and a modern UI. 🔹 Healthcare / Finance (Surgical Partners): practice management and accounting platform with real-time event streaming and secure integrations. 🔹 Industrial knowledge network (Torqn): large-scale platform built on .NET, Kafka, React Native, and Cosmos DB. 🔹 Mining: cross-platform React Native app with Azure Functions and a Contentful backend. 🔹 Insurance: microservice-based reporting platform with secure authentication and automated reports. 🔹 Charity: donation and gifting mobile app with recurring payments. 🎓 CERTIFICATIONS ✔️ Anthropic: Claude with the Anthropic API (2025) ✔️ Anthropic: Claude Code in Action (2025) ✔️ Stripe Certified Associate Developer (2024) ✔️ Contentful Certified Professional (2024) ✔️ Microsoft Certified: Azure Developer Associate (2019) In summary, I combine 10+ years of full-stack engineering with real, production experience using Claude and modern AI tooling. With a keen eye for detail and a commitment to excellence, I help clients ship faster, automate smarter, and deliver cutting-edge software solutions. Send me a message and let's talk about your project. 🔎 Skills & Keywords: Full Stack .NET Developer | Fullstack Developer | Senior .NET Developer | C# Developer | C Sharp | dotnet | ASP.NET Core | .NET Core | .NET 8 | Web API | REST API | Microservices | AI Developer | AI Engineer | AI Integration | LLM Integration | Generative AI | AI Agents | AI Agent Development | Agentic AI | AI Automation | Claude API | Anthropic API | Claude Code | OpenAI API | ChatGPT API | RAG | Vector Database | Embeddings | Prompt Engineering | MCP | Model Context Protocol | MCP Server | Microsoft Agent Framework | LangChain | n8n | n8n Developer | n8n Automation | Workflow Automation | Business Process Automation | AI Chatbot | API Integration | Node.js | TypeScript | JavaScript | Python | React | Angular | Next.js | React Native | Microsoft Azure | Azure Functions | Azure Service Bus | AKS | Cosmos DB | AWS | Docker | Kubernetes | Kafka | Event-Driven Architecture | DDD | TDD | CI/CD | SQL Server | MSSQL | PostgreSQL | MongoDB | Stripe Integration | Payment Integration | Contentful | Headless CMS | SaaS Developer | SaaS Development | MVP Development | Legacy .NET Migration | Technical Lead