I’m a senior software developer from Portugal with more than 20 years of experience building commercial desktop and mobile applications. I help teams build, stabilize, refactor, and extend products that involve real technical complexity. My work is focused on desktop and mobile software where senior technical judgment matters: Qt/C++ applications, native iOS and Android apps, performance-sensitive features, media and audio/video pipelines, computer vision, hardware integration, OS-level behavior, and long-term maintainability. I have worked on commercial products used by real customers, including projects such as Rocketbook - Document Scanning, Triller - Music Video Social Network, ROVR Radio - Audio Production & Dashboard, Toby - AI Real-Time Audio Translation, iContact - Camera Widget, VideoShop - Video Composition, iGreet - Augmented Reality Greeting Cards, LeanStreamer - Multiple Audio Encoding Streaming Tool, BigRoom - Automated AI Editor, and other desktop and mobile applications that required reliable implementation and careful technical decision-making. Clients usually hire me when they need help with: • building a desktop or mobile product properly from the ground up • refactoring an existing codebase without unnecessary rewrite risk • solving platform-specific issues that are blocking progress or release • implementing complex native features involving camera, audio, video, files, hardware, or OS APIs • improving architecture, maintainability, performance, and stability • adding senior technical depth to an existing team or codebase My core expertise includes Qt/C++, desktop software, native iOS and Android development, software architecture, refactoring, performance optimization, media processing, computer vision, and hardware or platform-level integration. I’m especially well suited for products that already exist and now need to be improved carefully. That may mean stabilizing a codebase, modernizing architecture, solving difficult technical issues, or extending the product in a way that remains clean and maintainable. I care about building the right foundation early, keeping the codebase understandable, and making technical decisions that still make sense in the long run. If your product already exists and needs senior technical help to move forward safely, I’d be glad to discuss it.

Holding a Rich experience in NFC, RFID & Bluetooth integrated solution. I have a skilled team in Device integration in Android, iOS & Desktop application Rich 20+ years of experience in IT organization. Mentor & Certified Scrum Master Solution Provided for Customers: 1. Unique Product Authentication 2. Know Your Customer - Mobile app by Scanning NFC Passports 3. Enterprise Software for Healthcare Industry with collecting information from Medical Device. 4. Inventory Tracking System using RFID / NFC 5. Employee Tracking using Passive & Active RFID 6. Event Management System using NFC 7. Digital Business Card Experienced in Integrating Mobile App (Android / iOS) with major NFC IC's 1. NTAG424 DNA & NTAG424 DNA Tag Tamper 2. NTAG213 / 215 / 216 3. DESFire Module M890 4. Mifare Classic 1K / 4K / 8K 5. Mifare DESFire EV1 / DESFire EV2 6. Mifare Ultralight & Ultralight C 7. M24LR04E-RDW6T/2 8. NFC-TAG-MN63Y1213_2020 Experienced in NFC & Bluetooth connectivity Readers : 1. ACR122U USB reader 2. ACR 1255U-J1 Bluetooth NFC Reader 3. ACR1311U-N2 Bluetooth NFC Reader RFID Device Integration with Cloud via MQTT: 1. [Passive RFID] 4 Port & 2 Port UHF RFID Fixed Reader 2. [Passive RFID] C72 Handheld UHF Reader 3. [Passive RFID] Sanray UHF RFID Integrated Handheld Reader F5009-H 4. [Active RFID] Sanray Active RFID Fixed Reader 5. [Passive RFID] UHF RFID Tag Printer Build applications using RFID UHF Tags: 1. Smartrac R6 DogBone RFID Wet Inlay (Monza R6) 2. Vulcan RFID Foam Backed Wristband (Monza R6) 3. Confidex Carrier Tough Slim RFID Tag (Monza 4QT) 4. Zebra UHF RFID Cards 5. Omni-ID Adept 650P RFID Cards 6. Triathlon Race Timing UHF RFID Sample Tags Expert Consultation in NFC, RFID & Bluetooth - Mobile App Development - iOS & Android - Mobile App Development - Native (Android - Java & Kotlin, iOS - Swift) & Flutter - Mobile App integration with PCB Boards & External Devices such as Weigh Scale - Server Development - C# Dot Net & Python - Build Interactive Website | Mobile App - UI & UX | Logo Design Proven Track Record - Building complete product for clients - Solution Provider - In Handling and Mentoring teams. Strong engineering & professional skills in Software Development Life Cycle (SDLC), Requirements Analysis, Business Analysis and Solution Architecture.

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.

🏆 TOP RATED PLUS ★★★★★ Recommended Freelancer on Upwork AI Senior .NET Developer with ✅ 15 years of experience, skilled in C#, .NET Framework, .NET Core, API Integration, and Microsoft Azure. Adept in Full Stack, Mobile, and Backend Development for comprehensive software solutions. ✔ Back-End Development: Expert in creating, supporting, and updating .NET projects; API creation and optimization; integrating AI solutions into .NET projects; and transitioning projects to Microsoft Azure cloud. ✔ Mobile App Development: Proficient in developing cross-platform mobile apps using MAUI and Xamarin. ✔ Full Stack Development: Skilled in building robust websites with ASP.NET MVC, ASP.NET Web API, Next.js, Angular, and React for a full-stack approach. ✔ Desktop Software Development: Experienced in Windows Desktop application development and support using WinForms, WPF, and Unity. ✔ Code Conversion: Skilled in converting code from C, Java, and Python to C#, optimizing for efficiency and maintainability. As a senior developer, I bring deep expertise across diverse .NET applications, including CFO-level insights for technical strategy, ensuring alignment with business goals.

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.

* Over 15 years of hands-on experience in leading a team of software developers. * Extensive experience in developing mobile, desktop, web, blockchain, IoT, and corporate solutions. * Expert knowledge of Object-Oriented Programming. * Expert knowledge in cross-platform software development for mobile (Android, iOS, WebOS, Tizen) and desktop operating systems (Windows, Linux, macOS) using C++ with wxWidgets, and C# with Xamarin. * Proven experience in successfully managing Blockchain startups. * 20 years of experience in software development. * wxWidgets Technology Evangelist in Eastern Europe.

Raphael is a Developer in Desktop (Windows & Mac), Mobile (Native - Android, iOS as well as Flutter) and Web with over 10 years experience . He is highly experienced in different technologies including: .NET, SQL, Java, PHP, JS and their different toolkits, frameworks and implementations. The most amazing project he worked on is a smart access management & POS system in the Dubai flagship Museum of the Future, the most beautiful museum in the World! "The best thing about a boolean is even if you are wrong, you are only off by a bit." -Anonymous

Are you looking for a reliable full-stack developer who can turn your ideas into powerful, scalable software? Don’t look around, you are at a perfect place. I specialize in developing modern, high-performance applications using C#, ASP.NET Core, Angular, React, and SQL Server, helping businesses streamline operations and grow faster. With a strong focus on clean architecture, performance optimization, and user experience, I deliver solutions that are not just functional but future-ready. I’m highly expert in developing end-to-end full-stack applications with a strong emphasis on maintainability, scalability, and security. My backend expertise in .NET Core allows me to build powerful APIs and microservices, while my frontend experience with Angular and React ensures intuitive, responsive, and engaging user interfaces. From database design and SQL performance optimization to cloud deployment on Azure and AWS, I deliver complete solutions tailored to your business needs. I also implement modern DevOps practices, including CI/CD pipelines and containerization, ensuring faster development cycles and reliable deployments. My Core Expertise: ✔ Full-Stack Web Development ✔ API Development & Integration ✔ Microservices Architecture ✔ Frontend Development ✔ Database Design & Optimization ✔ Cloud Solutions (Azure & AWS) ✔ DevOps: Git, Docker, CI/CD Pipelines ✔ Enterprise Application Development ✔ DevOps & CI/CD ✔ Legacy System Modernization ✔ Blazor & Modern Web Technologies Additional Services • Custom Web Applications • Desktop Application Development • Blazor Applications • API Integration & Automation • Website Performance Optimization • Responsive UI/UX Development • Smart Contract Integration (Blockchain-based solutions) Technical & Professional Skills • UI/UX Design Principles • Agile & Scrum Methodologies • Clean Code & Scalable Architecture • Performance Optimization • Version Control (Git) • Containerization (Docker) ✅ Why Choose Me? ✔ Clean, maintainable, and scalable code ✔ Fast communication & on-time delivery ✔ Business-focused solutions not just code ✔ Strong problem-solving and analytical skills ✔ Long-term support and collaboration I take pride in building long-term partnerships by delivering high-quality work, maintaining transparency, and continuously improving the products I develop. Let’s Work Together Have a project in mind? Click “Invite” or “Hire Now” and let’s build a high-quality solution that drives real results for your business.

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.

Hi, I'm Movses — a Software Engineer specializing in C++ and practical AI integration. I build reliable backends and APIs, fix difficult bugs in existing codebases, and ship AI features that actually work in production — not demos.