I am a C# .NET developer specialized in Windows desktop applications, POS systems, ERP solutions, and full stack .NET development. Most of my work revolves around building high-performance Windows applications using WPF, WinForms, and .NET Framework, combined with strong backend development using ASP. NET, ASP. NET Core, and REST APIs. I focus on building reliable, scalable, and production-ready software for business-critical systems like POS, ERP, CRM, kiosk applications, and hardware-integrated platforms. My core stack includes C#, .NET Framework, .NET Core, ASP .NET, ASP .NET MVC, Windows App Development, Desktop Application Development, API Integration, RESTful API, SQL, Microsoft SQL Server, PostgreSQL, WPF, WinForms, Windows Services, and Standalone Applications. I build both UI-heavy Windows applications and backend-driven integration systems. I have extensive experience in POS systems including POS terminals, POS software, payment gateway integration, inventory management, order management, and ERP software integration. I work with Point of Sale & Payment Systems, API-based POS sync services, Android POS utilities, kiosk mode applications, offline-first POS applications, and hardware integrations such as printers, cameras, barcode scanners, USB devices, Bluetooth devices, and COM port communication. On the backend side, I design APIs using RESTful architecture, build microservices, and develop secure API integration layers between ERP, CRM, POS, and SaaS platforms. I work with JSON, authentication, JWT, OAuth, logging, error handling, offline synchronization, and real-time integrations. My systems are designed to be cloud-ready and scalable using Azure, CI/CD pipelines, and containerized deployments when required. For Windows desktop development, I build professional WPF and WinForms applications including kiosk platforms, shell replacement systems, device control utilities, screen recording software, clipboard tools, document automation, trading applications, charting platforms, and reporting tools. I follow clean architecture and MVVM for WPF projects and deliver stable EXE builds with application installers. I also build hybrid systems using WebView2, Blazor, and React to connect desktop applications with modern web platforms. This allows POS back offices, admin panels, dashboards, and reporting systems to be built as full-stack products using .NET and modern frontend frameworks. Databases are a major part of my work. I design schemas, write optimized queries, stored procedures, and integration layers using Microsoft SQL Server, PostgreSQL, SQLite, MongoDB, and structured reporting systems like SSRS. I build reporting dashboards, financial reports, inventory analytics, and trading reports. I work on enterprise-level products such as ERP systems, CRM platforms, POS infrastructure, SaaS applications, microservice architectures, and financial platforms. I also build AI-powered features including LLM integration, AI model integration, Python execution inside .NET, analytics insights generation, and automation workflows.

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

I am a professional Technical Writer with over 6 years of experience specializing in creating clear, comprehensive, and user-friendly documentation for cloud technologies, with a strong focus on AWS (Amazon Web Services). I excel at transforming complex technical concepts into accessible content for developers, DevOps engineers, system administrators, and non-technical stakeholders. My core expertise lies in producing high-quality AWS cloud documentation, including architecture diagrams, API references, user guides, deployment manuals, troubleshooting guides, and knowledge base articles. ### Technical Expertise: - **AWS Cloud Documentation**: Deep experience with AWS services such as EC2, S3, Lambda, VPC, RDS, IAM, CloudFormation, and more. I document infrastructure as code, serverless architectures, security best practices, and cost optimization strategies. - **Programming & Development Knowledge**: Strong hands-on understanding of multiple programming languages, allowing me to write accurate and in-depth code examples, API documentation, and developer guides. - C and C++ (system-level programming, performance optimization, embedded systems) - Java (enterprise applications, Spring Boot, microservices) - Python (scripting, automation, data processing, AWS Boto3 SDK) I can effectively document SDKs, libraries, REST APIs, CLI tools, and complex software systems because I understand the code behind the cloud infrastructure. ### What I Deliver: - Professional AWS Well-Architected Framework documentation - Developer portals and API references - Technical blogs, whitepapers, and how-to guides - Migration and integration documentation - Video script writing and tutorial content I combine strong writing skills with genuine technical depth, ensuring your documentation is not only accurate but also genuinely useful for your target audience. Whether you need end-to-end cloud documentation for a new product, API docs for your SaaS platform, or modernization of existing AWS technical content, I deliver high-quality work that reduces support tickets and improves user experience. Ready to make your AWS cloud solutions and technical projects easier to understand and adopt? Let's discuss your documentation needs.

I am a Senior .NET/C# and AI Engineer with 7+ years of experience building reliable, scalable, and production-ready solutions. I specialize in developing Windows and web-based applications using ASP.NET Core, MVC, Web Forms, WPF, Windows Forms, and modern UI frameworks like Kendo UI, Telerik, Bootstrap, and jQuery. I am equally strong in backend logic, API development, SQL optimization, and performance tuning. Alongside full-stack .NET development, I build advanced AI systems using Computer Vision, Large Language Models (LLMs), and Document AI. I help businesses automate workflows, analyze images and video, extract insights from documents, and integrate AI into existing products. I deliver clean code, strong communication, and end-to-end ownership from understanding the requirement to deployment in cloud environments. If you need a developer who can deliver high-quality .NET applications and intelligent AI-driven solutions, I’d be happy to work with you.

Senior .NET Core engineer building production systems where correctness isn't optional real-money trading platforms, law enforcement evidence systems, and AI-integrated fintech, for US and UK clients. ➤ Order Management & Risk Management System Velocity Clearing (US equity clearing firm) Tech: .NET Core, FIX protocol, SQL Server, Apache Ignite, NetMQ 🔹 Fixed a production race condition causing incorrect margin approvals under peak load — diagnosed with dotnet-trace/PerfView, not guesswork 🔹 Built real-time order lifecycle event streaming with strict ordering guarantees ➤ Digital Evidence Management Platform US law enforcement (GETAC) Tech: .NET Core, Python, YOLO v7, OpenCV, CUDA, Kafka, Azure 🔹 Computer vision pipeline processing video evidence at scale with confidence-scored detection 🔹 Strict tenant isolation, audit trails on every mutation, zero cross-case data leakage ➤ Keytomic AI SEO SaaS Platform (built and shipped) Tech: .NET Core, OpenAI API, PostgreSQL 🔹 1,200+ active users, featured on Product Hunt 🔹 Multi-tenant architecture, automated content generation pipeline ➤ Customs Declaration Automation UK/EU logistics (FF Customs) Tech: .NET Core, OpenAI agentic workflow, HMRC Sequoia integration 🔹 80% reduction in manual document processing I use Claude Code daily to move faster but architecture decisions and code quality are always mine to own, never unreviewed AI output. I read before I touch, ship incrementally, and document what changed and why. Available for long-term engagements and fixed-scope projects, with workable US/UK timezone overlap. Backend: C#, ASP.NET Core, CQRS, MediatR, Clean Architecture, Entity Framework Core AI/LLM: OpenAI, Anthropic Claude, RAG pipelines, LangChain, pgvector, Azure Cognitive Search Cloud: Azure (App Services, Data Factory, DevOps), AWS (EC2, Lambda, S3, RDS) Data: SQL Server, PostgreSQL, Redis, Apache Kafka Real-time: SignalR, WebSockets, gRPC Keywords: .NET Core developer, C# developer, ASP.NET Core developer, Azure developer, AWS developer, AI integration developer, OpenAI API developer, Claude API developer, RAG pipeline developer, SQL Server developer, PostgreSQL developer, microservices developer, full stack .NET developer, trading systems developer, fintech backend developer.

I'm a skilled developer with 10+ years of experience in the software industry, especially within Microsoft, cloud & mobile app solutions. Tell me your needs and I will do my best to help you. Having previously worked with large enterprises as well as many smaller start-ups, I have a broad range of experience and knowledge of the full software delivery lifecycle. Why should you hire me: ✅ I work fast and achieve your goals on time ✅ My total programming experience is 10+ years ✅ 200+ successful projects delivered ✅ Solid logic reasoning and problem-solving skills ✅ Responsiveness and high-quality delivery ✅ Best software development practices using ✅ Highly skilled Full Stack Developer and Mobile Developer team for enterprise solutions I am not interested in "one-hour" or "one-day" jobs. I establish long-lasting relationships with my clients. I always consider a commitment to the result as the first priority. Since 2015, I've been working as CEO at Lvivity - a boutique dev shop that I founded. My team will deliver you the best service, communication, and also reliable, and scalable code that will fulfill your business needs. Here is a list of technologies I have experience with: 🔸 Programming - .NET C# Architect, PM, BA, CEO @ Lvivity.com 🔸 Databases - MSSQL, MySQL, MongoDB, Oracle, Flat files (CSV, XML) 🔸 Source Control - TFS, GIT, SVN 🔸 API's - Google, eBay, Facebook, LinkedIn, Twitter, Amazon 🔸 And much more: ASP.NET MVC / Core2 / WPF / Xamarin / SWIFT, React.Native, Flutter, Azure, AWS So, I guarantee my enthusiasm for work and fulfilling my project with inexpressible efforts.

Senior Software Architect specializing in secure systems and IoT Sec solutions with 15+ years of experience. I architect and deliver end-to-end nfc solutions, from embedded firmware to cloud-based backend systems. 🎯 CORE EXPERTISE IOT Systems - NFC Solutions: Reader/Writer, HCE, Digital Wallets (Android/iOS) - Smart Cards: JavaCard, MIFARE, DESFire, NTAG,Global Platform,GP,JCOP,Secure Element - Security: PKI, FIDO, Secure Element,HSM, PCI-DSS Compliance - RFID Systems: Asset Tracking, Access Control - EMV Payment: L1/L2/L3 Kernel Development & Certification - Microcontrollers: ESP32, STM32 (WiFi/BLE, RTOS) - Firmware: Secure Bootloader, OTA Updates, Real-time Systems - Industrial Applications: POS Terminals, Vending Machines, Access Control - IoT Architecture: Sensor Integration, Remote Management Full-Stack Development - Backend: Node.js, REST APIs, Database Design (SQL/NoSQL) - Cloud Services: Firebase, AWS/Azure/GCP Deployment - Mobile: Android (NFC APIs), iOS (CoreNFC), React Native - Desktop: Qt, .NET, Cross-platform Applications - Languages: C/C++, JavaScript/TypeScript, Java, C# 💼 SIGNATURE PROJECTS ✅ ESP32 IoT Systems - Created NFC-enabled payment solution with cloud integration - Built secure firmware with OTA update capabilities - Integrated Firebase for real-time data synchronization ✅ Cross-Platform Digital Wallet - Developed mobile wallet supporting EMV contactless payments - Implemented HCE and Secure Element integration - Built Node.js backend with Firebase authentication ✅ Enterprise RFID Solutions - Designed asset tracking systems for industrial clients - Implemented access control with NFC/RFID readers - Deployed cloud-based management platform ✅ EMV Payment Terminal Solutions - Developed EMV L2 & L3 kernel for contact/contactless terminals - Achieved EMVCo certification for payment applications - Implemented secure key management and transaction processing 🔧 TECHNICAL STACK Hardware: ESP32, STM32, NFC Readers, RFID Systems Backend: Node.js, Express, Firebase, REST APIs Database: MongoDB, PostgreSQL, MySQL, Firestore Cloud: Firebase, AWS, Azure, Docker deployment Mobile: Android, iOS, React Native Desktop: Qt, .NET, Windows/Linux Security: PKI, FIDO, PCI-DSS, Secure Boot 📋 CERTIFICATIONS & STANDARDS EMVCo, PCI-DSS, PBOC, Global Platform, ISO 14443 I deliver production-ready solutions with clean code, comprehensive documentation, and ongoing support. Available for both fixed-price projects and long-term contracts.

⭐⭐⭐⭐⭐ Top Rated Freelancer | 100% Job Success | 5-Star Client Feedback Embedded Systems | Embedded Linux & Android Systems Engineer | Linux · Yocto · Qt/QML · AOSP · Android Automotive · Android Development · ADB Automation · C/C++ · Python · Java · Kotlin If you're building a product that runs Linux or Android under the hood - from an embedded device to an infotainment system - and you need someone who understands every layer from the hardware up, I can help you ship it. I specialize in the space most engineers avoid: the gap between hardware and the software stack. That means I can trace a boot failure to a kernel driver, customize an AOSP build from scratch, fix a VHAL service that drops vehicle signals, or write Python tooling that replaces hours of manual ADB work across a fleet of devices. What I work on: - Embedded Linux - Yocto, BSP bring-up, driver development, cross-compilation - AOSP builds and system-level customization (permissions, overlays, HALs, system services) - Android Automotive OS - VHAL, AIDL interfaces, CarService integration - Python ADB automation - multi-device control, test frameworks, CI scripting - Android app development in Kotlin/Java when the project needs it - Boot, performance, and crash debugging across hardware and software layers - Docker environments for reproducible builds and clean dev workflows Why this matters for your project: Most engineers are strong at one layer - app, firmware, or Linux. I work across all of them. That means I catch integration bugs that fall between teams, and I can translate clearly between hardware and software sides so nothing gets lost. Recent work includes Android Automotive infotainment systems, AOSP-based product customization, and Python automation tools for multi-device QA workflows. If you're dealing with a system-level issue, need an embedded Linux or Android build customized, or want automation that actually works at scale - let's talk.

Looking for someone to automate your business processes, build custom applications, or improve your existing systems? I have 8+ years of experience building business applications using .NET, Azure, Power Apps, Power Automate, and Power BI. I help businesses save time, reduce manual work, and create reliable solutions that grow with their needs. Skills : 🔹C# / ASP.NET Core / .NET 🔹Power Apps (Canvas & Model-Driven) 🔹Power Automate 🔹Power BI Dashboards & Reports 🔹Azure Services 🔹Azure Functions & Service Bus 🔹REST API Integration 🔹SharePoint & Microsoft 365 🔹SQL Server & Dataverse 🔹Azure DevOps & CI/CD I Can Help With 🔹Custom Web Applications 🔹Power Apps Development 🔹Workflow Automation 🔹Power BI Reports & Dashboards 🔹API Integration 🔹Azure Cloud Solutions 🔹Database Design 🔹Application Support & Maintenance My Experience ✔ Built business applications used by more than 80,000 users. ✔ Migrated legacy .NET applications to modern .NET Core. ✔ Developed Power Apps and automated business processes to reduce manual work. ✔ Integrated applications with Azure Services, APIs, and Microsoft 365. ✔ Worked on projects in finance, supply chain, and business automation. 🏆 Top Rated Freelancer 🏆 100% Job Success 🏆 50+ Successful Projects I believe in clear communication, clean code, and delivering quality work on time. Whether you need a small update or a complete solution, I'll work closely with you to make sure your project is successful. Let's build a solution that saves time, improves productivity, and helps your business grow.

Full Stack Developer | ASP.NET Core · Azure and Javascript Expert | 8 years building production SaaS and FinTech platforms. My recent projects are: → eventio: AI-powered event management (.NET 8, React, Next.js, Azure OpenAI) → approvpay: FinTech SaaS with Stripe and QuickBooks (Angular, .NET Core, NgRx) → ruleonetoolbox: Real-time stock data platform (.NET 6, Angular, Azure Functions) → findd: Payroll and time-attendance SaaS (.NET Core, React, ServiceNow, MongoDB) What I build: .NET Backend & REST API Development ASP.NET Core Web APIs and Microservices using Clean Architecture, CQRS, and MediatR. Entity Framework Core, SQL Server, PostgreSQL, and MongoDB. Tested with xUnit and TDD — not added at the end. Full-Stack SaaS Development End-to-end platforms with React, Angular, Next.js, and TypeScript frontends connected to .NET backends. NgRx and Redux for state. Production-ready, not just demo-ready. Azure Cloud & DevOps Azure App Services, Functions, Key Vault, Service Bus, and Azure AD. CI/CD with Azure DevOps and GitHub Actions. Docker containerisation from day one. AI Integration Azure OpenAI and OpenAI API wired into live .NET applications — already shipped, not proof-of-concept. Third-Party Integrations Stripe, QuickBooks, SAP, ServiceNow, and Azure AD. Complex integrations handled end-to-end. Testing & Code Quality TDD, xUnit, Selenium, and integration testing baked into the process — not added at the end when it's already broken. Stack: Backend: C# · ASP.NET Core · .NET 8 · SignalR · Microservices · CQRS · MediatR · Clean Architecture Frontend: React · Angular · Next.js · TypeScript · NgRx · Redux Databases: SQL Server · PostgreSQL · MongoDB · CosmosDB · Entity Framework Core · Dapper Cloud & DevOps: Azure · Docker · CI/CD · Azure OpenAI · Azure DevOps · GitHub Actions Integrations: Stripe · QuickBooks · SAP · ServiceNow · Azure AD If you're building a .NET SaaS platform, FinTech product, or AI-integrated web application — send me the brief.