For seven+ years I have owned critical modules of a distributed platform serving millions of physical devices across four transport protocols, HTTP, SMTP, XMPP, and file transport, for a Japanese enterprise client. I write the ingestion, processing, and automated-decisioning layers. The system cannot be rolled back. Mistakes have physical cost. Outside that engagement I have delivered: production AI and vector search in C#, a commercial encrypted email security platform across .NET 8 API, Office.js Outlook add-in, and Gmail extension, a GIS-backed enterprise infrastructure platform across 14 service modules over 12 months; and VSTO Office Add-In work across Excel, Word, PowerPoint and Outlook spanning five years. My work is in the systems other engineers are afraid to touch, legacy estates that must keep running while they evolve, distributed architectures under real load, and AI integrated into environments where hallucination is a liability. I take ownership. I do not participate.

I am a senior software engineer with 10+ years of experience delivering robust, high-performance solutions across Microsoft, Cadence, and Oracle. My core expertise spans C++ development, backend architecture, and scalable data systems. In my freelance work, I’ve recently built production-grade backends for fintech/crypto clients, including a Crypto Data API (FastAPI · Redis · PostgreSQL) that unified multiple providers (CoinGecko, CryptoQuant) into normalized endpoints. The system featured background workers, Redis caching for sub-200ms responses, Postgres persistence for analytics, and secure access controls with rate limiting and admin tooling. I specialize in: ---Modernizing legacy codebases (C++/backend refactoring). ---Designing high-throughput APIs with FastAPI/NestJS. ---Integrating distributed workflows with Kafka & real-time data. ---Building resilient storage layers in Postgres, MongoDB, and Redis. I work with precision, accountability, and a strong focus on reliability and scalability. Whether extending thick client applications, designing APIs, or integrating complex data pipelines, I ensure production-grade quality with minimal supervision. Typical Workflow: Requirement clarification → Architecture & planning → Incremental development → Regular demos/updates → Production-ready delivery. Skills Snapshot: Languages: C++ (11/14/17/20), Python, TypeScript Frameworks: FastAPI, NestJS, Qt, React Data: PostgreSQL, MongoDB, Redis, Kafka Cloud & Tools: Docker, GitHub Actions, DigitalOcean What You Get - Clean, well-structured code with documentation - Production-ready APIs and data pipelines - Transparent communication and regular updates - Focus on reliability, scalability, and maintainability - Iterative, collaborative approach that adapts as requirements evolve

I’m a .NET Developer with 6+ years of experience in creating high-quality Windows and web apps. Key Skills: ASP.NET Core (5-8), MVC, Web Forms WPF, Windows Forms HTML5, CSS3, Bootstrap, JavaScript, jQuery API Integration, Kendo UI, Telerik I focus on performance tuning and optimizing database queries. With solid expertise in client-side technologies and frameworks like WPF, MVVM, and XAML, I’m committed to delivering efficient, scalable solutions. Clear communication is my priority. I ensure clients are always updated on progress. Let’s connect to discuss how I can help your next project!

🏆 10+ Years Experience | ⏱️ 12,000+ Upwork Hours | ⭐ 100% JSS | 🏅 AWS Certified Developer – Associate | 🏅 Microsoft Certified: Azure Fundamentals (AZ-900) | 🏅 Microsoft Certified: Azure Data Fundamentals (DP-900) | 🤖 AI Agent Development (OpenAI • Claude) | 🚀 300+ Projects Delivered I engineer secure, enterprise-grade Microsoft ecosystems. I specialize in bridging corporate data with modern workflows—transforming legacy infrastructures into intelligent environments using Microsoft 365 Copilot, Azure OpenAI, Semantic Kernel, and advanced AI Agents. If your enterprise needs to automate complex workflows, securely integrate custom AI tools, or modernize legacy systems without risking data leaks, I provide the senior architectural oversight to deliver. Enterprise Copilot & AI Integration Custom AI agents (Copilot, Claude, OpenAI APIs), Copilot Studio plugins connecting M365 Copilot to external databases, and secure Azure OpenAI / Semantic Kernel deployments — built to pass enterprise security review, not just demo well. Microsoft 365 & Graph API Architecture Deep Graph API integrations across Teams, Outlook, and SharePoint. Modern Office.js add-ins and legacy VSTO development for Excel/Word/Outlook. Power Automate workflows and custom connectors for teams retiring manual processes. Cloud Backend & Identity Security ASP.NET Core APIs and Azure Functions on .NET 8/9. OAuth2, OpenID Connect, and Microsoft Entra ID SSO. Legacy .NET Framework → modern .NET migrations. Cross-platform desktop via WPF, WinForms, and .NET MAUI. Availability: Europe time zone, with daily overlap into EST — real-time collaboration for US and EU teams. CERTIFICATIONS & TRUSTED CREDENTIALS • Microsoft Certified: Azure Fundamentals (AZ-900) • Microsoft Certified: Azure Data Fundamentals (DP-900) • AWS Certified Developer – Associate I work directly with enterprise stakeholders and technical teams to deliver clean architecture, strict data compliance, and long-term maintainability. Let’s connect to build your next-generation Microsoft ecosystem.

I'm a full-stack developer with a deep and diverse mix of experience including VB, C#, Python, Java, and JavaScript. I am an expert at building streamlined applications and integrating systems using well-designed APIs. As a full-stack developer, I'm adept at intuitive front-end and complex back-end architectures. My solutions are both solid and scalable and I thrive on improving workflows, solving measurable business problems and delivering user-friendly work that is both manageable and sturdy in the long term.

Senior .NET developer and Power BI specialist with 10+ years of experience delivering end-to-end Microsoft-stack solutions — web apps, APIs, desktop systems, and BI dashboards. I work across the full SDLC: solution architecture, backend development, data modelling, Azure cloud deployment, Testing & QA, and post-launch support. Experienced in Agile/Scrum methodologies, sprint planning, Azure DevOps pipelines, and cross-functional team collaboration. I apply clean architecture and SOLID design principles to build systems that scale without becoming a maintenance burden. My .NET work covers: — ASP.NET Core, .NET 8/9, C#, MVC, Web API, Blazor, Razor Pages, WCF — WinForms, WPF desktop application development — Entity Framework Core, LINQ, Dapper, MSSQL Server, PostgreSQL, MongoDB, Redis — RESTful API development and third-party API integrations — Azure: App Services, Functions, DevOps, Azure SQL, Cosmos DB, CI/CD Pipelines — Microservices, Docker, Kubernetes, clean architecture patterns Power BI & Data: — Interactive dashboards, KPI reports, and executive scorecards — DAX, Power Query (M), data modeling, and ETL pipelines — SQL Server Reporting Services (SSRS), data warehousing — Direct integration with Azure SQL, Cosmos DB, Excel, SharePoint, and REST APIs AI & Emerging Tech: — Azure OpenAI, LangChain, Semantic Kernel, RAG implementations — Vector databases: Pinecone, pgvector — AI-powered workflows and intelligent automation within .NET and Azure environments Frontend when needed: — Angular, React, TypeScript, Blazor WebAssembly, Tailwind CSS, Bootstrap I've worked in agile teams using Azure DevOps, JIRA, Git, and Bitbucket. I deliver clean, documented code — and I don't disappear after go-live. If you need solid Microsoft-stack development, data insights through Power BI, or AI integrated into your .NET systems — let's talk.

🏆 𝗧𝗼𝗽 𝟭% .𝗡𝗘𝗧 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝗼𝗻 𝗨𝗽𝘄𝗼𝗿𝗸 | $𝟮𝟬𝟬𝗞+ 𝗘𝗮𝗿𝗻𝗲𝗱 | 𝟭𝟱𝟬+ 𝗣𝗿𝗼𝗷𝗲𝗰𝘁𝘀 | 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀 𝗮𝗰𝗿𝗼𝘀𝘀 𝟭𝟭,𝟬𝟬𝟬+ 𝗵𝗼𝘂𝗿𝘀 I help startups and businesses build, modernize, and scale web applications on the Microsoft stack with deep specialization in healthcare and SaaS platforms. Over the past 10+ years, I've delivered everything from FHIR-compliant patient management systems to full-scale marketplace platforms. 𝗔 𝗳𝗲𝘄 𝗵𝗶𝗴𝗵𝗹𝗶𝗴𝗵𝘁𝘀: ✅ Built SplashMD, a mental health practice management system used by clinics daily ✅ Developed a full-stack Instacart-style delivery platform (1,800+ hours, single ongoing client) ✅ Migrated and supported enterprise applications on Azure - App Services, Functions, DevOps pipelines, AKS, and Key Vault ✅ Implemented secure integrations: FHIR, HIPAA-aware workflows, two-factor authentication, and payment systems 𝗪𝗵𝗲𝗿𝗲 𝗜 𝗰𝗿𝗲𝗮𝘁𝗲 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝘃𝗮𝗹𝘂𝗲: 🏥 𝗛𝗲𝗮𝗹𝘁𝗵𝗰𝗮𝗿𝗲 & 𝗛𝗲𝗮𝗹𝘁𝗵𝗧𝗲𝗰𝗵 - Mental health practice management systems, patient/provider portals, FHIR API integration, and HIPAA-conscious architecture. Built SplashMD, a practice management platform used by clinics daily. ⚙️ 𝗙𝘂𝗹𝗹-𝗦𝘁𝗮𝗰𝗸 .𝗡𝗘𝗧 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 - ASP.NET Core, C#, Web API / REST, Blazor, Entity Framework Core, Clean & Microservices architecture, paired with Angular front-ends. ☁️ 𝗖𝗹𝗼𝘂𝗱 & 𝗗𝗲𝘃𝗢𝗽𝘀 (𝗔𝘇𝘂𝗿𝗲) - App Services, Functions, Logic Apps, AKS, CI/CD pipelines, Key Vault, RBAC & identity management deployed cleanly and built to scale. 🛒 𝗠𝗮𝗿𝗸𝗲𝘁𝗽𝗹𝗮𝗰𝗲 & 𝗦𝗮𝗮𝗦 𝗣𝗹𝗮𝘁𝗳𝗼𝗿𝗺𝘀 - Multi-vendor delivery platforms, payment gateway integration, 2FA, and third-party APIs. 𝗪𝗵𝘆 𝗰𝗹𝗶𝗲𝗻𝘁𝘀 𝗸𝗲𝗲𝗽 𝘄𝗼𝗿𝗸𝗶𝗻𝗴 𝘄𝗶𝘁𝗵 𝗺𝗲: ✔️ End-to-end ownership - Angular/Blazor front-end, ASP.NET Core back-end, Azure deployment, all from one person. ✔️ Clean, maintainable code with proper architecture - not just "it works today." ✔️ Long-term partnerships - most of my contracts run for years, not weeks. ✔️ Clear communication, honest timelines, and reliable support. Clients describe me as trustworthy, professional, and dependable on tight deadlines. 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀: C#, ASP.NET Core, ASP.NET MVC, .NET 8, Blazor, Web API, REST API, Entity Framework Core, Dapper, LINQ, SignalR, TypeScript, JavaScript, jQuery 𝗙𝗿𝗮𝗺𝗲𝘄𝗼𝗿𝗸𝘀: Angular, Bootstrap, HTML5, CSS3, Razor Pages 𝗖𝗹𝗼𝘂𝗱: Microsoft Azure, Azure Functions, Azure Logic Apps, Azure DevOps, Azure App Service, Azure SQL, Cosmos DB, Blob Storage, Data Lake, Key Vault, Azure AD, Front Door, Traffic Manager, CI/CD Pipelines 𝗗𝗮𝘁𝗮𝗯𝗮𝘀𝗲𝘀: SQL Server, T-SQL, MySQL, PostgreSQL, Azure SQL, Cosmos DB, Database Design, Query Optimization 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲: Clean Architecture, Microservices, MVC, SOLID, Design Patterns, Repository Pattern, System Design, Scalable Architecture, API Design 𝗜𝗻𝗱𝘂𝘀𝘁𝗿𝗶𝗲𝘀: Healthcare Software, HealthTech, Mental Health Platforms, FHIR, HIPAA Compliance, E-Commerce, Marketplace Platforms, SaaS, B2B Portals 𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀/𝗦𝗸𝗶𝗹𝗹𝘀: Full-Stack Development, Web Application Development, Legacy Modernization, Azure Migration, Third-Party API Integration, Payment Integration (Stripe/PayPal), Two-Factor Authentication, Technical Consulting, Solution Architecture If you need a senior developer who can own your project end-to-end, architecture, development, deployment, and maintenance let's talk. 📩 Message me with few details about your project, and I'll respond within a few minutes.

If your .NET system is slow, unstable, hard to maintain, or blocking business growth - I fix that. I help businesses rescue, modernize, and scale legacy .NET applications without disrupting ongoing operations. Most of my clients reach out when: - Their legacy system is crashing, slow, or insecure - Developers left and nobody understands the code - Compliance audits (HIPAA / PCI-DSS) are failing - The system can’t scale with users or business demand - They want to modernize without a risky full rewrite With 8+ years of experience, I’ve helped companies in Healthcare, FinTech, ERP, POS, and HRMS turn fragile legacy systems into secure, cloud-ready platforms used by thousands of users daily. ✅ What I Can Do for You - Stabilize and refactor legacy .NET / ASP .NET applications - Modernize WebForms or MVC apps into clean, scalable architectures - Migrate systems to .NET Core / .NET 6–8 and Azure - Fix performance bottlenecks and security vulnerabilities - Design compliance-ready systems (HIPAA, PCI-DSS, HL7/FHIR) - Build new systems the right way using Clean Architecture 💡 How I Work (and Why Clients Keep Me) - Clarity first - I break complex systems into simple, business-friendly plans - No surprises - Milestone-based delivery with clear progress visibility - Production-ready quality - Clean, maintainable, documented code - Post-delivery support - Free bug fixes for 1 week after delivery - Partner mindset - I challenge bad decisions and suggest better solutions 🛠 Core Tech Backend: C#, .NET Core 6/7/8, ASP .NET MVC, Web API Frontend: Angular, Blazor, Razor, WebForms, React Cloud: Azure, Azure Functions, Docker, Kubernetes Architecture: Clean Architecture (CQRS + DDD), Microservices Security: JWT, OAuth2, HIPAA, PCI-DSS Databases: SQL Server, PostgreSQL, Cosmos DB 📩 Not Sure Where to Start? Send me: - A short description of your system - What’s currently broken or limiting growth I’ll analyze your setup and provide a clear solution roadmap free of cost, even if we don’t end up working together. 👉 Click “Invite to Job” and let’s fix this properly.

Senior .NET Developer with 10+ years of experience building secure, scalable, and high-performance enterprise applications, SaaS platforms, backend APIs, and cloud-based systems using C#, .NET Core, ASP.NET Core, Azure, SQL Server, React, Angular, and modern software architecture patterns. I help startups, SaaS companies, and enterprises build new applications, modernize legacy .NET systems, develop robust APIs, create full-stack applications, and deploy scalable solutions on Microsoft Azure. My experience covers the complete application lifecycle — from architecture and database design to backend development, frontend development, cloud deployment, API integrations, security, CI/CD, and performance optimization. What I Can Help You Build ✔ Full-Stack .NET Applications — End-to-end applications using C#, ASP.NET Core, .NET 8, Web API, React, Angular, JavaScript, TypeScript, and Blazor. ✔ SaaS & Multi-Tenant Applications — Secure multi-tenant platforms with tenant management, role-based access, dashboards, workflows, subscriptions, and scalable application architecture. ✔ ASP.NET Core & Web APIs — RESTful APIs, ASP.NET Core Web API, backend services, third-party API integrations, authentication, authorization, and enterprise integrations. ✔ Legacy .NET Modernization — Modernizing legacy .NET Framework applications and migrating older architectures toward modern ASP.NET Core and .NET applications. ✔ Azure Cloud Applications — Azure App Services, Azure Functions, Azure DevOps, cloud-native application deployment, Docker, Kubernetes, and CI/CD pipelines. ✔ Modern Frontend Development — React, Angular, TypeScript, JavaScript, and Blazor-based interfaces integrated with secure .NET backends. ✔ Enterprise Architecture — Clean Architecture, Domain-Driven Design, CQRS, SOLID principles, microservices, event-driven systems, and maintainable application architecture. ✔ Database & Performance Engineering — SQL Server, PostgreSQL, MySQL, MongoDB, Entity Framework Core, LINQ, Dapper, database design, optimization, and high-performance queries. ✔ Authentication & Security — JWT, OAuth2, Azure AD, role-based access control, secure API authentication. 𝐂𝐨𝐫𝐞 𝐓𝐞𝐜𝐡𝐧𝐨𝐥𝐨𝐠𝐲 𝐒𝐭𝐚𝐜𝐤 𝐁𝐚𝐜𝐤𝐞𝐧𝐝: C#, .NET Core, .NET 6/7/8, ASP.NET Core, ASP.NET Core Web API, REST APIs, GraphQL, Entity Framework Core, LINQ, Dapper, SignalR 𝐅𝐫𝐨𝐧𝐭𝐞𝐧𝐝: React, Angular, JavaScript, TypeScript, Blazor, Razor Pages 𝐂𝐥𝐨𝐮𝐝 & 𝐃𝐞𝐯𝐎𝐩𝐬: Microsoft Azure, Azure App Services, Azure Functions, Azure DevOps, Docker, Kubernetes, CI/CD 𝐃𝐚𝐭𝐚𝐛𝐚𝐬𝐞𝐬: SQL Server, Azure SQL, PostgreSQL, MySQL, MongoDB 𝐀𝐫𝐜𝐡𝐢𝐭𝐞𝐜𝐭𝐮𝐫𝐞: Clean Architecture, Domain-Driven Design, CQRS, SOLID, Microservices, Event-Driven Architecture, N-Layered Architecture 𝐒𝐞𝐜𝐮𝐫𝐢𝐭𝐲 & 𝐂𝐨𝐦𝐩𝐥𝐢𝐚𝐧𝐜𝐞: I follow a security-first development approach, building applications with security, privacy, and compliance requirements considered from architecture through deployment. -HIPAA & Healthcare Security -GDPR & Data Privacy -SOC 2 Security Principles -OWASP Top 10 Protection -RBAC & Least Privilege -OAuth, JWT, SSO & MFA -API Security & Secure API Design -Multi-Tenant & Data Isolation -Encryption at Rest & in Transit -Audit Logging & Security Monitoring -Secrets Management -Secure SDLC & Vulnerability Prevention 𝐀𝐈-𝐀𝐬𝐬𝐢𝐬𝐭𝐞𝐝 𝐃𝐞𝐯𝐞𝐥𝐨𝐩𝐦𝐞𝐧𝐭: Cursor, Claude, AI-assisted development, debugging, code optimization, and development automation 𝐒𝐞𝐥𝐞𝐜𝐭𝐞𝐝 𝐏𝐫𝐨𝐣𝐞𝐜𝐭 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞: Property Management SaaS Platform Built a multi-tenant SaaS platform with tenant management, role-based dashboards, reporting, business workflows, and secure access using .NET Core, React, Angular, Azure, and SQL Server. Employee PDP Management System Developed planning modules, approval workflows, reporting functionality, authentication, authorization, and secure access management for an enterprise workforce management platform. School Management Platform Developed a complete .NET Core application with authentication, teacher and student portals, scheduling, administration dashboards, and business workflows using Clean Architecture and MySQL. Enterprise Internal Systems Integrated enterprise applications with Azure AD, SharePoint, HR platforms, insurance systems, and multiple third-party APIs while maintaining secure authentication and reliable data exchange. API & Payment Integrations Implemented integrations with Stripe, PayPal, CRMs, and enterprise APIs with secure authentication, API communication, error handling, and business workflow integration. I don't just focus on writing code. I first understand the business requirements, existing architecture, technical constraints, and scalability needs so the solution is designed correctly from the beginning. If you're looking for a Senior .NET Developer to build, modernize, scale, or maintain a SaaS, enterprise, or cloud-based application, send me your requirements.

Software development isn't just my profession—it's what I've been building companies around for more than 28 years. I specialize in projects that other developers consider too difficult, too specialized, or too risky. My work spans Windows low-level programming, system internals, AI-powered applications, healthcare software, enterprise platforms, and high-performance C++ systems where architecture, reliability, scalability, and performance are critical. My expertise includes Windows internals, native Win32 development, file systems, security, performance optimization, reverse engineering, system-level debugging, and modern AI technologies including Large Language Models (LLMs), agentic AI, clinical NLP, and Retrieval-Augmented Generation (RAG). Core Expertise: • Windows Low-Level Programming & System Internals • Native Win32 Development • High-Performance C++ Software • AI Systems & LLM Applications • Clinical NLP & Healthcare AI • Enterprise Software Architecture • Performance Optimization • Reverse Engineering • Cybersecurity Professional Credentials • BBB Accredited Business • Microsoft Supplier • Member of HTCIA • Founder & CEO, Secured Globe, Inc. • Inventor with registered patents